# Seismic base shear example

** An example using this method can be found in PCA Notes, see the Additional Reading section below. practicing engineers," NEHRP Seismic Design Technical Brief No. 2 S DS D (AISC 7-05 Eq. 6-1, based on the structure’s seismic design category, structural system, dynamic properties, and regularity, or with the approval of the authority having jurisdiction, an seismic design and detailing requirements, which have been mostly incorporated in chapters 18-23 of the CBC) and ASCE Appendix 11A (dealing with quality assurance provisions, which is covered in chapter 17 of CBC). increases to seismic base shear for presence of torsional For example, the. 5. 3: Matched Static and Dynamic Base Shear using Method 1. 6 While much attention has been dedicated to achieving wall base connections that can develop a couple out and seismic parameters like time period, base shear, storey displacement and storey drift are checked out. 2 Frame Design base shear in a given direction shall be determined from the following Basic horizontal seismic coefficient. 8 65 b. Seismic responses – base shear, over- turning moment, and sloshing wave height – are calculated by using the site re- sponse spectra and performing a few simple calculations. The goal of this structural seismic design example is to calculate the seismic design force and seismic base shear for a reinforced concrete building structure. The difference between the segmented and perforated shear wall design approach and an overview of various hold-down design methods is discussed. Each mode has a base shear that comes from the modal displacement at each joint with mass in the direction being excited by the base acceleration and the input spectral acceleration and the modal frequency. 0 (11. If is less than response quantities are (for example member forces, displacements, storey forces, storey shears and base reactions) multiplied by V B/ Response spectrum method of analysis shall be performed using design spectrum. 75, the maximum value specified by UBC Section 1628. Q: What is the difference between Seismic and Seismic (drift) load pattern types? A: A Seismic (drift) type load pattern is the same as a Seismic load pattern except for the fact that Seismic(drift) does not enforce certain upper limits on the period resulting in a lower base shear and deflections when checking drift limits. Then the seismic base shear is I = 1. Therefore, pseudostatic seismic forces generated in Robot are scaled so that the sum of reactions for the main seismic direction equals the base this information and the base shear formula we can determine the amount of earthquake force expected to strike this building. 8. 5% and 10. ABSTRACT . First, analytical study was conducted to investigate impact of formation of in-span plastic hinges on horizontal boundary elements (HBEs) on the seismic behavior of SPSWs. The AISI requirement applies when the R-factor (seismic response modification coefficient) is taken as greater than three, and would be applicable to the example building with an R-factor of 6. ” Typically in tilt-up concrete buildings, the concrete slab on grade is utilized as a deadman to transfer lateral loads out of the shear walls through the slab and into the soil. 2 Seismic load calculation for a medium-rise masonry building to NBCC 2005 4-8 3 Seismic load distribution in a masonry building considering both rigid and flexible diaphragm alternatives 4-22 4a Minimum seismic reinforcement for a squat masonry shear wall 4-34 4b Seismic design of a squat shear wall of conventional construction 4-41 This module simplifies the process by properly ordering the items and the necessary decisions to be made in working toward a final seismic base shear value. used to adjust the elastically-computed seismic forces, V = ZIC R W, where V = seismic base shear, Z = local site specific peak ground acceleration, I = importance factor, C = normalized response spectra ordinate, W = weight, with adjustment to suitably combine the effects of the structure, water impulsive and water convective (sloshing) components Design Seismic Base Shear, VB From IS 1893- 2002, Clause 7. 1. During the analysis, the codes required for the use of the equivalent static force procedure and a dynamic lateral force procedure. . 2. is an extreme example; however, it is worth pointing Seismic base shear is a function of seismic response coefficient, C s and effective seismic weight W. N2 - An approximate method for determining the seismic base shear of high-rise building structures on the basis of the preliminary design information is presented. 6. In this post, I will go over the second seismic design example in our seismic design of structures course covering the calculation of seismic forces. Institute of Timber Engineering and Wood Technology holz. S. Nonbuilding structures similar to buildings • Dynamic response similar to buildings • Structural systems are designed and constructed similar to buildings • Use provisions of Chapter 15 and applicable parts of Chapters 11, 12, 14, . Gravity loads considered to act simultaneously with the seismic action should be maintained constant in the pushover analysis, while lateral forces for calculating seismic loads is the equivalent lateral force procedure. www. to obtain the design base shear V d. . 12. 73 KN from ELFM. 2nd. The base shear formula is: Earthquake Force = 0. The following are several examples, first V CWs (2. 1). DunCan anD Leigh arBer, P. Here, V max and V min remain constant for all sections because they don’t depend upon height of section, Step-3. The shear modulus is largest at low strains and decreases with increasing shear strain (9). Department of Civil Engineering, Curtin University, Kent Street, Bentley WA 6102 . Example C6 3- Determination of the Seismic Base Shear: The structural analysis shall consist of one of the types permitted in ASCE 7-10 Table 12. the design base shear (V B) shall be compared with a base shear (V b) calculated using a fundamental period T. specific seismic design provisions. Shear keys are used in the bridge abutments and piers to provide transverse restraints for bridge superstructures. 6-1, based on the structure’s seismic design category, structural system, dynamic properties, and regularity, or with the approval of the authority having jurisdiction, an alternative generally accepted 2 / DESIGN GUIDE 1, 2ND EDITION / BASE PLATE AND ANCHOR ROD DESIGN The vast majority of building columns are designed for axial compression only with little or no uplift. Seismic Design Maps Due to insufficient resources and the recent development of similar web tools by third parties, the USGS has streamlined this U. For example, the slight decrease in seismic base where QE is effect of horizontal seismic shear force calculated based on seismic base shear V, or Fp from equation for components, non-structural elements, etc. 1. In this case the R value of each subsystem in that direction must be known, for example R = 8. 4. , f p in the 1994 edition) governs the seismic Research was conducted to investigate the seismic performance of steel plate shear walls (SPSWs) designed by different philosophies. 4. The b. Seismic design of anchor rods in shear. Research and Development Walter P Moore and Associates V (Base Shear) is calculated using the Governing Equation listed next to it. For the same building shown in Example (2), evaluate the seismic forces at floor tell how the seismic weight of structure and base shear can be shown. 5 - Compute Shape Factor Seismic Behavior and Design of Composite Steel Plate Shear Walls, by Abolhassan Astaneh-Asl 6 S DS The design spectral response acceleration at short periods (IBC-2000). MATTHEWS DATE 10/6/01 PAGE A-1 CONCEPTUAL DESIGN Design a grade separation underpass structure for a single track over a city street. with various conditions of lateral stiffness system. Example of first break picking on Strataview field monitor. After earthquake zone has been identified, the following steps are followed: Determination of Linear Static Seismic Lateral Force using UBC-97 Code: 1. Archetypes were sized based on the design basis earthquake (DBE) response spectra specified in FEMA P695 (2009) for high seismicity [i. Frame Analysis and Columnar Seismic Forces for Multiple Column Bent – 500 and 1000 Year Design Earthquake Return Period a. , NIST GCR 8-917-1 NEHRP Seismic T1 - Estimating seismic base shears of tall wall-frame buildings. 3. Considering the design aspect, the seismic forces remain constant in a particular Zone provided the soil properties remain same whereas the Wind This program provides analysis of lateral seismic forces on multi-story buildings according to the 1994 UBC lateral force formulas 28-1, 28-6, 28-8 and the diaphragm force formula 31-1. 24 Aug 2018 strain rates acting on walls during seismic events are much larger the displacement at which the base shear resistance has dropped below 50% of the peak example of the schematization of a wall is shown in Figure 1). 11. In this article, a wood frame shear wall is analyzed and compared per American Wood Council’s 2015 Wood Frame Construction Manual (WFCM) and 2015 Special Design Provisions for Wind and Seismic (SDPWS). 3, the design base shear where, W - seismic weight of the building Ah - horizontal seismic coefficient Horizontal Seismic Coefficient, Ah As per IS 1893(Part 1)-2002, Clause 6. Values of Design base shear for all the sections of vessel must be between Maximum and Minimum limits, calculated as above. Calculation of the Seismic Base Shear, V - The seismic base shear, V, in a given direction shall be determined in accordance with the following equation: V C s W (12. Modelling of shear keys in bridge structures under seismic loads. 3 for a shear wall, which are their maximum values according the base shear requirement were accompanied by the introduction of other detailed seismic provisions in 1976 and 1988. In general, these changes can be attrib-uted to changes in seismic mapping and changes in coeffi-cients used in the lateral force formula. VB = Base shear. N. 1 for two-story buildings (above grade plane) seismic design procedure considers the more severe case where the rupture of a seismic fault that crosses a bridge structure causes significantly different ground displacements for the supports on either side of the fault. Which of the following will be required to be increased by a factor of 1. with those coefficients, for example like 1. Then, enter values for story heights above grade and seismic weight (approximately equal to the dead load) for Base shear is an estimate of the maximum expected lateral force on the base of the structure due to seismic activity. 05g, Site Class D, and Seismic Design Category E. Therefore, pseudostatic seismic forces generated in Robot are scaled so that the sum of reactions for the main seismic direction equals the base Base shear is an estimate of the maximum expected lateral force that will occur due to seismic ground motion at the base of a structure. , P. 2 Development of Base Case Profiles and Nonlinear Material Properties Seismic refraction surveys ranging in length from about 400 to 700 ft (120 to 215 m) were performed during the original site investigation to determine the compressional wave (P-wave) and shear wave (S-wave) velocities for the site foundation materials. 002 according to both the Chilean and Canadian seismic requirements for regular buildings and to 0. At first, a fully multimodal procedure based on an adaptive version of the capacity spectrum method is applied to the 3D model of the damped braced structure. Diaphragm connection to the vertical elements C. Displayed is the 760 m/s WNA reference rock template Five different configurations of shear walls viz. ), and overall dimensions. fhwa. How can I calculate base shear and how can it be normalized? You need to take the sum of the horizontal reaction forces at each of the base nodes. Seismic Design Force and Base Shear Example 1 - Calculating seismic design force and base shear on a 6 story reinforced concrete building; Example 2 - Calculating the seismic design force and seismic base shear for a building using the simplified analysis procedure I got confused today when I noticed in the ICC seismic design guides that they calculate the base shear 2 different ways. sEismic UpgradE By Cynthia J. The building is located in Hayward, California (San Francisco bay), with S S of 2. 2 is the anticipated ground acceleration measured in Gs. D. Most members . When designing the primary lateral force resisting system, I would have several pages of seismic base shear calculations and, oh yeah, a one- or two-line calculation of the wind forces – just to show that seismic governed. Determining the Seismic Base Shear Structural Design Criteria, Analysis, and Procedures Each structure shall be assigned a seismic use group (ASCE 7 Table 9. Wallace Fall 04 1 CE243A 1 Seismic Code Requirements John W. 4) Qualitatively describe the equivalent lateral force method and identify when it is appropriate to use as well as its limitations. 14-12) where: F = 1. 6. The design lateral load is distributed between the shear walls according to two methods: flexible diaphragm method and rigid diaphragm method (see Appendix C for description of the methods). a comparative study of design base shear for rc buildings in selected seismic design codes 1061 range, and the higher minimum base shear, which is governing in the long-period range. The seismic forces, computed by IS: 1893-2002 are found to be significantly higher, the difference varies with structure properties. Psycharis “Displacement-Based Seismic Design” 14 A2. 66k analysis is combined with seismic hazard assessment can be defined more easily. 8kN and -137092. W = total seismic dead load of the structure (dead loads plus applicable portions of some storage loads and snow loads, as specified in UBC 1630. Step-wise displacement-based design procedure for SPSW with rigid HBE–VBE connections. 1 - Obtain Design Criteria Design Step 6. A summary of the seismic CodeMaster Seismic Design (2015 IBC / ASCE 7-10) (SDINA15A) + $24 This 6-page laminated reference guide provides an easy-to-follow 11-step procedure for seismic design in accordance with the 2015 IBC and ASCE 7-10, with emphasis on the seismic design of a typical one-to-three story building. From the results they conclude that the seismic responses namely base shear in X and Y directions for structure with shear wall are found to be 3. The base shear is always computed using the total seismic weight. Bearing wall system 1. Also, the minimum design base shear limitation for Seismic Zone 4 was The horizontal seismic load effect with overstrength factor (Emh) shall be determined in accordance with the following: Emh 0QE ASCE 7 (12. Base shear per ASCE 7-16 Section 12. 2). 7. 1) Hi there, I am working on an existing building and trying to determine base shear due to seismic loads using the ASCE/SEI 41-06, 'Seismic Rehabilitation of Exis Distribution of seismic forces Vertical distribution of seismic base shear: Seismic base shear, V, is distributed to each floor level, according to the following equation (ASCE 7 eq. 8 for mm 1. 4) where S DS is seismic parameter, D is effect of dead load. Longitudinal Base Shear 4. 68k 4. 3 BASE SHEAR FORCE AND DISTRIBUTION OF 5. For strength design, vertical seismic load effect shall be calculated as. Key words: Seismic base isolation, simplified design, building structures, rubber bearing, response modification, base shear, yield force, shear modulus, damping. Volume 1: Code Application Examples, provides step-by-step examples for using individual code provisions, such as computing base shear or building period. 07T e V The value of au may be found as the ratio of the base shear on development of a full plastic mechanism according to a pushover analysis to the base shear due to the design seismic action (Fig. Wood structural panel walls for structures three stories or less 5. and shall be divided by R d R o as defined in Article 4. Description Seismic Lateral Force Distribution for Ductility-Based Design of SPSW Fig. Base isolation is an anti-seismic design The Sub-Committee first published “Design Recommendation for Storage Tanks and Their Supports” in 1984, and amended it in the 1990, 1996 and 2010 publications. 005 Abstract Concrete shear walls are used as the seismic force resisting system in many high-rise buildings in Western Canada. 2 - Select Optimum Bearing Typ Design Step 6. K. SEISMIC BASE ISOLATION: A FIVE-STORY BUILDING EXAMPLE By ERIK ANDERS NELSON Submitted to the Department of Civil and Environmental Engineering On May 7, 1999 in Partial Fulfillment of the Requirements for the Degree of Master of Engineering in Civil and Environmental Engineering Abstract 163 3- Determination of the Seismic Base Shear: The structural analysis shall consist of one of the types permitted in ASCE 7-10 Table 12. V Shear force, also base shear. calculated differently for the determination of wind and seismic loading? Are the results of a Cs, for base shear determination using is displayed in the seismic section of Ta- ble 1 and . 8 -1) where, C s is the seismic response coefficient, and W is the effective seismic weight. TWO CLASSIFICATIONS included in . Calculations of base shear (V) depend on:soil conditions at seismic effect, Vertical distribution of base shear, Orthogonal effects on corner columns, Diaphragm forces, Accidental torsion, Foundation ties, Unique calculations and detailing for Special Steel Systems, Concrete detailing and splice lengths when subject to high seismic, Wood frame hold-downs, Masonry wall anchors, and Wind governed buildings. It was concluded that such Base Shear Determination See ASCE 7-05 12. AISC Seismic Provisions for Structural Steel Buildings, but nevertheless a set of design provisions has been developed by AISC in conjunction with the Structural Engineer’s Association of California. e. EERI, Subhash C. LRFD Steel Girder SuperStructure Design Example Bearing Design Example Design Step 6 Table of Contents Design Step 6. This method uses the flexure and axial Seismic Rehabilitation has been working to combine ASCE 31-03 into ASCE 4106 while also updating both standards. Geometry definition Because the aim of this example is to describe the method to do Modal Analysis, we will use a simple six-story structure, with a storey height of 3 meters. The seismic base shear V in a given direction is determined in accordance with . In 1971, after the San Fernando earthquake when two VA buildings collapsed, VA began to undertake a full seismic safety program. 5) Compute the seismic coefficient and design base shear values. 03 k ) = 11. Lam University of Melbourne, Australia B. 8. SEISMIC . Many consider this to be unreasonable, since this minimum design base shear is essentially a minimum strength requirement, with its magnitude arbitrarily set. The base shear is calculated using the design ground motion described in the previous section and modified to account for the structural characteristics and importance placed on a building. Section 14. Changes in the range of seismic base shear over time are shown in Figure 1. The in-plane wall weight is assumed to be equal to 13 psf. Design notes for seismic design of building accordance to Eurocode 8 addresses only the magnitude of the base shear captured by themodes taken into account ings and the AISC Seismic Provisions used in each example, the new Seismic Design Manual will prove to be an effective refer-ence for designers. Example 1/Page 4. The program includes a complete national zip code database and USGS databases of seismic ground motion specifically for use with ASCE 7. 3 BASE SHEAR FORCE AND DISTRIBUTION OF THE HORIZONTAL FORCES. The result = the pounds of force that must will try and separate the house from the foundation. 0(DL)+0. The equivalent lateral force procedure in ASCE 7 determines the seismic base shear in a given For an isolated structure, the two indices of the most concern in this study are the dimensionless base shear force mitigation ratio γ SF, which is the ratio of the RMS of the base shear force of the 2DOF-FPIS, σ SF, F P I S, to the RMS of the base shear force of the fixed-base single-degree-of-freedom (SDOF) structure, σ SF, 0, and the CE 243A Behavior & design of RC Elements Prof. Instructional Material Complementing FEMA P-751, Design Examples. We may interpret “base shear calculated using a To check if we successfully scaled the model, the static base shear should match with the dynamic base shear as highlighted in the table below. In this paper, the nonlinear modeling of shear walls are ranged from two dimensional nonlinear shell elements to simplified models using frame elements. Wallace, Ph. NOTE: State license renewal information is provided as a convenience only and is subject to change at any time. Figure 17. Governing Equation is the equation which was used to calculate the base shear. 4kN and the corresponding shear-weight ratios are 11. Seismic base shear of buildings with shear walls at various locations with fixed base and with SSI subjected to Elcentro1 ground motion is as shown in Fig. Base Shear - International Building Code (IBC) The IBC addresses the probability of significant seismic ground motion by using maps of spectral response accelerations (S s and S 1) for various geographic locations (see IBC Figures 1615(1) through 1615(10)). J. 087 W 1. Design Steps Reinforced masonry shear walls must be designed for the effects of: 1) gravity loads from self-weight, plus gravity loads from overlying roof or floor levels; and 2) moments and shears from in-plane shear loads Actions are shown below. H 18-8 – SEISMIC DESIGN REQUIREMENTS October 1, 2016 . • Design Example 2 - Design of Frames, Columns, Bracing and other Elements of the Lateral Force Resisting System. The 2006 JBC Structural/ Seismic Design Manual illustrates how the provisions of the code are used. Design input: • Rail - Track consists of continuous welded rail (CWR) on timber ties. Online Seismic Base Shear Calculator (IBC2006 and ASCE 7-05 Specifications - Using Equivalent Lateral Force Procedure for Regular Single-Level This module simplifies the process by properly ordering the items and the necessary decisions to be made in working toward a final seismic base shear value. corner displacements, maximum base and story shear forces and the maximum 5 Jun 2019 Keywords: damping device; seismic design; design base shear; nonlinear Two design examples for steel moment frames using nonlinear son of seismic design loads (seismic base shear) and resis- tance values of . The seismic restraint force for various components is also calculated. 2 = 0. 153 (5) Design Base Shear: The design base shear in the 1997 UBC varies in inverse proportion to the period T, rather than T2/3 prescribed previously. 03 kips * Seismic Provisions Example – A Beginner’s Guide to ASCE 7-05 Compute E There is no Dead Load story shear so E = DQE = 1. Cs is the seismic response coefficient used to calculate the seismic base shear, V. exploring the behavior of shear wall with opening under seismic load action on member forces. Kelly, P. x: The total seismic weight of the whole structure is the sum of the seismic weights associated with all floors and the weight associated with the base level. 1 The seismic base shear in a given direction shall be determined in accordance with the following: W R FS V DS ASCE 7 (12. 14. This analysis will produce the effect of higher modes Step 9 Calculate the structures seismic base shear using Sections 1281 and 1282 from CEES 4753 at The University of Oklahoma, Norman The base shear coefficients shown in Table 1 represent the shear force (or lateral load) that the buildings are designed to resist, normalized by their weight. These issues amongst others contain:-Seismic zone maps and reference ground The Seismic Design Category may be determined by the design spectral acceleration parameters combined with the Occupancy Category. Seismic shear distribution among interconnected cantilever walls of different lengths Katrin Beyer1,*, Sabrina Simonini1, Raluca Constantin1 and Avigdor Rutenberg2 1École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland Section 11. 14/DESIGNGUIDE1,2NDEDITION/ BASE PLATE AND ANCHOR ROD DESIGN For example, in statically loaded structures, if the strength is much larger than the demand, the ductility is not necessary and it is acceptable to design with the limit state of tensile or shear strength of the anchor rod group governing the design. Calculate Earthquake Forces on Buildings and Structures. Because this building property cannot be computed for a structure that is yet to be designed, building codes provide empirical formulas that depend on the building material [steel, reinforced concrete (RC), etc. Also included is a section that will assist the user in determining the overall seismic factor. 2 . Example calculations of seismic base shear for wood-frame wood structural panel shear walls (A15), wood-frame shear walls with other sheathing materials (A17) and cantilevered column systems (G6) are summarized in Table 4. seismic design of base-isolated structures [4], the philosophy of which is presented in detail in [5]. 3. A seismic load generated in accordance with the Response Spectrum Procedure should not be greater than a load calculated using the simplified method (Equivalent Lateral Force) as a base shear force. Evaluation of Effective Seismic Weight, W – see Appendix 2 seismic waves. the base shear V0 is the same): Also, Pe meae n i 1 e i i n i 1 i i e n i 1 i i n i 1 U. Example No. results are used to compare the seismic response viz. This current revised recommendation provides bulk material pressures for silos and further guidance on seismic design methods for storage tanks based on the horizontal load- Design Example 1 n Concrete Diaphragm Design—Four-Story Building Given Information Site data: Site Class D (stiff soil), by default Building data: The example building is Risk Category II in accordance with Table 1. EQ base shear can be calculated based on the parameters provided by users as per IS1893-2002 including building height, base dimension, type of building, zone, type of soil condition etc. Seismic Design Maps web application. V ns Nominal shear strength of a member or a plate. 2 2012 IBC SEAOC Structural/Seismic Design Manual, Vol. These amplified *This is the seismic weight of the walls per floor area. With the increase in R value Base Shear and Base Moment decreases. System Response Factors for Prestressed Masonry—In determining seismic base shear and story drift for structures whose seismic lateral force-resisting system consists of prestressed masonry shear walls, the value of the response modification coefficient, R, and of the deflection amplification factor, C d, are required to be taken equal to Re: Minimum base shear in seismic load That's the solution that I'using but as I change the structure the base shear changes so I have to modify the combination factor. BASEMENT: A basement is any story below the lowest story above grade. AU - Smith, Bryan Stafford. 8, in two orthogonal horizontal directions using the fundamental period Ta . Earthquake Load Calculation (base shear method) The 3-story standard office building is located in Los Angeles situated on stiff soil. When following, section 1630. Gaull To understand it very simply, when an earthquake is applied on a building, at each lumped mass we have inertial force opposing the movement of the building. It is a collection of structural elements which should substantially decouple a superstructure from its substructure resting on a shaking ground thus protecting a building or non-building structure's integrity. 4 Design Example 1 Special Moment Frame for ease of calculation or computational efﬁ ciency. Background . 7%, depending on the seismic zone. The specific problem I address is the estimation of net-to-gross from a clastic reservoir, however the workflow is adaptable for a variety of other applications. MRS analysis), the base shear, and thus the diaphragm force, includes a reduction due to response modi "cation coe#cient (R) to which the building frame system is assigned. A simple spread sheet for calculating Earthquake base shear for building as per IS1893-2002. 2 x weight of house Directions: Enter general data (city, importance factor), seismic data (site class, seismic force resisting system), and wind data (exposure category, plan and parapet dimensions, and coefficients for directionality and topography). Base Shear, V = CsW Where: Cs = seismic response coefficient W = the effective seismic weight, including applicable portions of other storage and snow loads (See ASCE 7-05 12. 2 defines the base of the structure as “the level at which horizontal seismic ground motions are considered to be imparted to the structure. As we can see the maximum base shear in X and Y directions are respectively - 145158. Dynamic Analysis Procedures (continued) 5) The elastic base shear, V e obtained from a Linear Dynamic Analysis shall be multiplied by the Importance factor I E as defined in Article 4. 3 ). 2. Architectural simplicity, relatively low base shear. V nse direction, using the seismic base shear Vs resisted by each subsystem as the weighing factor. ETABS is used to calculate the self-weight of the slabs, beams, girders, columns and shear walls. 03 k seismic base shear, V, which is used in the design of elements of the seismic force-resisting system. Seismic design according to EN 1998 for a 5-storey reference building in CLT. i . Most of the concepts that apply to AASHTO Bridge Seismic Design also apply to the Cal- Wood is a proven choice for seismic-resistive construction. Design Base Shear (V): Base Shear (V) is the total design lateral force or shear at the base of the structure. Prior to joining Simpson Strong-Tie, my career involved the design of projects in California’s San Francisco Bay Area. Multi-Layer Shell Element The shear wall is modeled using a fine mesh of smeared multi-layer shell elements. 5-1 of ASCE 7-10. Hence the aim of present study is to compare seismic performance of 15-Storey with openings in shear wall situated in earthquake zone V. However, seismic criteria must be addressed in this case. Base shear is the maximum anticipated lateral force likely to occur at the base of a structure due to seismic ground motion. In this post, I will go over the first seismic design example in our seismic design of structures course covering the calculation of seismic forces. For Shear Force, Seismic shear force =(F seismic) css = u i Where, F t = Portion of base shear, = 0. Uniform building code (UBC-97), defines base shear as total lateral force at bottom of structure due to ground motion during an earthquake. Some models are prepared that is bare frame, brace frame and shear wall frame. See ASCE 7 – §12. Next, let us consider the behavior and design of reinforced masonry shear walls. 2011 example due to the fixed base assumption. For buildings assigned to Seismic Design Category D, masonry shear walls must satisfy the requirements for special reinforced masonry shear walls in accordance with Standard Section 12. , S. 8 = 1. Members are encouraged to discuss problems, design assumptions, retrofit issues, calculation,etc which are related to seismic here. I was hoping that there was a way of getting this scaling in a automatic way. The paper proposes a displacement-based design method for seismic retrofit of RC buildings using hysteretic dissipative braces. 2) Seismic Weight, W See ASCE 7-05 12. U ang (1991) showed that if the actual response envelope of the structure, considering drift vs. When scaling base shear in seismic analysis, I thought that the seismic analysis should be scaled (for example X direction) according to the reaction in X direction from the MAIN CONTRIBUTING MODE, not the CQC total reaction. For more information, see WBDG Designing Buildings to Resist Explosive Threats section on Seismic vs. E v = 0. 1 The seismic base shear is given by Formula (28-1) as (ZlC/Rw)Wwhere SEISMIC RETROFITTING OF EXISTING STRUCTURES BY CETIN SAHIN A research project report submitted in partial fulfillment of the requirement for the degree of The detail design progression has been proposed to be included in Bangladesh National Building Code (BNBC). 1 Example of Eight-Story Irregular Building. An apartment building of reinforced concrete construction was built in 1930. It only finds your base shear forces, you will still need to plug any seismic shear forces into either your ASD? or LRFD? load combinations to solve for the variety of structural solutions. natural period T of the building, and calculate the design seismic base shear VB on the building. BASE SHEAR: Total design lateral force or shear at the base. Keywords: Seismic design code, Design response spectrum, Base shear force, . Which formula you choose depends on the shape and height of your building and how it is built. where Q E is effect of horizontal seismic shear force calculated based on seismic base shear V, or F p from equation for components, non-structural elements, etc. 3), based on its corresponding occupancy category (determined from ASCE 7 Table 1-1) and a corresponding occupancy importance factor as indicated in ASCE 7 Table 9. Examples C1 through C5 are a set of examples that illustrate the elevation of a single-story home with a crawlspace. design base shear (V B) obtained by response spectrum modal analysis shall be compared with a base shear (V' B) calculated using a fundamental period Ta, Where V B is less than V' B, all the response quantities (for example member forces, displacements, storey forces, storey shears and base reactions) shall be multiplied by (V B /V' B The seismic behaviour of buildings erected in . For short-period, wood-frame structures, seismic base shear, V, is calculated in accordance with Equation 1. 2 Provided that for any structure with T < 0. - Track is aligned perpendicular to the street. In Location of Base for Seismic Design By Dominic J. 2 SDSD (AISC 7-05 Eq. E. , for example, are shown in Figure 1 . Design Response Spectrum (LRFD) b. 2 requires that the base shear obtained by dynamic analysis (VB = 610 kN) be compared with that obtained from empirical fundamental period as per Clause 7. My load case-1 is simple IBCC code seismic load (with R=1) and same code base response spectrum in load case-3. EXAMPLE. For our example we would use the base shear formula as follows: V = 0. Solid Timber Construction . NIST (2016). Seismic Base Shear. The structure of the building is steel special moment frame. 3 Base shear should be more or less than what? Let us try to understand structural dynamics using some static approaches. steelwise A brief overview of what’s new in the 2nd Edition AISC Seismic Design Manual. Seismic attribute delineation of lineaments and reservoir compartmentalization: An example from the Devonian Dollarhide field, Central Basin Platform, west Texas. storey shear and base shear computed as per the two versions of seismic code. The mem-bers of the building frame are detailed Diaphragms for seismic loading A philosophy for analysis and design Seismic Design Category E. The factors C s and W are used to estimate the base shear . Per AASHTO, no seismic analysis is required for structures in Zone 1. Specifically, the total base seismic shear for buildings and nonbuilding structures is calculated. There are actually a few different formulas used to calculate the base shear. 0, resulting in the Cp curve shown by the Keywords: lateral loads, seismic design, shear walls ing the building base shear and distributing earthquake forces to lateral load resisting . 5 second. Instructional Material Complementing FEMA 451, Design Examples Seismic Isolation 15 -7-3 Outline Seismic Base Isolation – Configuration and Qualitative Behavior of Isolated Building – Objectives of Seismic Isolation Systems – Effects of Base Isolation on Seismic Response – Implications of Soil Conditions Seismic Base Shear, V Strength Design force leveli ASCE 7 – §12. The design base shear in a given direction is specified by the formula: Clause 7. It may be noted that total lateral base shear is about 6 of total seismic from CIVIL CE f212 at Birla Institute of Technology & Science, Pilani - Hyderabad parameter. bau forschungs gmbh. 1 Base shear Base shear V can be calculated through various approaches. g. These frames are analyzed for seismic forces to assess performance in terms of base shear, storey drift, member forces and joint displacements. Structural Analysis, Part 1 - 1 . Seismic Base Shear:. Introduction In this section, a step- by- step procedure for the elastic analysis of a building is described for Sesimic Actions highlighting the key recommendations of BC3, using Ductility Class DCL. 7 Evaluation of seismic design shear using the ‘lateral provisions, and everyday structural engineering design practice. Instructional Material Complementing FEMA 451, Design Examples Seismic Load Analysis 9 - 17 1a, 1b) Stiffness (Soft Story) Irregularity Vertical Structural Irregularities Irregularity (1a) exists if stiffness of any story is less than 70% of the stiffness of the story above or less than 80% of the average stiffness of the three stories above. In one example they only included the weight of 1/2 the height of the shear walls from the ground level up to the second floor, then in another case they included all of the shear walls that were parallel to the seismic Sample Design Calculations. ACI 17. 8Prohibited in Seismic Zones 2A, 2B, 3 and 4. If VB is less than that from empirical value, the response quantities are to be scaled up. … Field welded plate washers to base plate at each anchor Example 12: Anchor Bolt + No Anchor Reinft + Tension & Shear + CSA A23. The new combined standard has eliminated any inconsistencies that previously existed between the two 2. The seismic response of four structures, designed without base shear scaling, A good example of this approach to design is the capacity design of a regular seismic design category for a structure is permitted to be determined in . Worked examples presented at the Workshop “EC 8: Seismic Design of . Seismic base isolation, also known as base isolation or base isolation system, is one of the most popular means of protecting a structure against earthquake forces. dot. This is a simplified procedure that can be used for seismic analysis on residential decks be-cause residential structures are built with light-frame construction. Online Seismic Base Shear Calculator (IBC2006 and ASCE 7-05 Specifications - Using Equivalent Lateral Force Procedure for Regular Single-Level Building/Structural Systems) for structural engineers, construction professionals and building planners. Non-structural element forces . 9 times the seismic force associated with the base shear plotted in Figure 2. Seismic performance assessment or seismic structural analysis is a powerful tool of earthquake engineering which utilizes detailed modelling of the structure together with methods of structural analysis to gain a better understanding of seismic performance of building and non-building structures. Table 1. Serrano, Charles H. EERI, and Soon-Sik Leec) It is well recognized that structures designed by current codes undergo This paper describes seismic analysis of high-rise building using program in STAADPro. Goel,b) M. Summary Reservoir compartmentalization of the Dollarhide Field has DESIGN EXAMPLE This example demonstrates the design methods for analysis of the lateral force resisting system of a one-story house (Figure E1). * Seismic Provisions Example – A Beginner’s Guide to ASCE 7-05 Determine the Design Shear Force for the Shearwall on Grid A and the 2nd Floor Story shear from structural analysis is 11. hazard and an upper bound of seismic base shear for areas of high seismic hazard. 08% more than structure without shear The paper deals with the seismic retrofit of a multiple building structure belonging to the Hospital Centre of Avellino (Italy). Compute 4)Dominant effect of earthquake is equivalent to horizontal force of varying magnitude over 5) Approximately determines the total horizontal force (Base shear). Example 3: Equivalent Static Method: the seismic force effect on the . Collector connections using the overstrength factor D. The structure has lost one moment bearing element at the base of each wall, and this load bearing capacity must be maintained by the moment capacity of shear wall-frame connections, by the weight of the rocking shear wall itself, and by any additional mechanisms, such as bracing, or post-tensioned tendons running through the wall (figure 2. Travel Time Curves . - The result of that humongous effort is the soonto--be released ASCE 41-13: Seismic Evaluation and Retrofit of Existing Buildings. Department of the Interior U. 5/0. W. 8%. In the case of a bridge, base shear reduction will minimize damage to the piers. uncertainty in site specific shear wave velocity profiling where sparse or limited information is available. Base The AVO difference shows pseudo-shear reflectivity: Top taken and the base shear for Indian code, Eurocode and IBC is calculated respectively in both X and Z direction. Travel time curves for three arrivals shown previously: E-7 Seismic Retaining Wall Wall Example • Consider a spillway with crest structure cantilever walls that are 2-feet thick at the base and 40-feet high. Crouse Robert Pekelnicky 15 May 2017 The goal of this structural seismic design example is to calculate the seismic design force and seismic base shear for a reinforced concrete Seismic Load Analysis 9 - 1. Fig. 1 also waives the requirement to design for seismic shear “where the shear component of the strength level earthquake force applied to a single anchor or group of anchors is equal to or less than 20 percent of the total factored anchor shear force associated with the same load combination”. The formulas are given in the Prior to joining Simpson Strong-Tie, my career involved the design of projects in California’s San Francisco Bay Area. building correspond to high seismic tributary weight for each SPSW and vice versa. Design seismic base shear is proportional to effective seismic weight, W, the seismic hazard at the site represented by the spectral The terms used to calculate base shear (V) in UBC Equation 30-4 are defined as follows: . Longitudinal Base Shear 5. EXAMPLE 1: Seismic load calculation for a low-rise masonry building to NBCC 2005 Calculate the seismic base shear force for this building to NBCC 2005 3 Aug 2009 More detailed explanations and examples can be found in my text. Geological Survey Base shear which is a concern for all buildings during an earthquake. So if, for example, you have a 10 storey BASE: The level at which the horizontal seismic ground mo-tions are considered to be imparted to the structure. Please see following simple questions to clarify my concept. • Design Example 1 - Determination of Seismic Design Forces. 8 Equivalent Lateral Force Procedure, F. Analysis is done with response spectrum method. ], build ing type (frame, shear wall, etc. Multi-storey Buildings Basic assumptions 1. floodproofing, and construction of a floodwall in a residential setting. of obtaining satisfactory seismic base connections in thin-sectioned precast concrete wall panels. Title 38 - United States Code, section 8105 required the EUR 25204 EN - 2012 Eurocode 8: Seismic Design of Buildings Worked examples Worked examples presented at the Workshop “EC 8: Seismic Design of Buildings”, Lisbon, 10-11 Feb. 4) where SDS is seismic parameter, D is effect of dead load. Eurocode 8: Seismic Design of Buildings Worked examples 2. I. 3-04 Code . 5 second and 2. the seismic base shear. Among the innovations of these base-isolation guidelines is that a simplified method of seismic analysis is allowed for the design of low-rise, shear-wall base-isolated structures. EXAMPLE CALCULATION – Seismic Actions to BC3: 2013 Page 4 of 22 1. DESIGN OF BASE ISOLATION SYSTEM FOR BUILDINGS by installation of shear walls and the use of composite materials. 3R-11 Guide for Design of Anchorage to Concrete: Examples Using ACI 318 Appendix D sheathed and steel-sheathed shear walls. Seismic Base Shear Determination Steps Selection of Lateral-Force Procedure : A seismic load generated in accordance with the Response Spectrum Procedure should not be greater than a load calculated using the simplified method (Equivalent Lateral Force) as a base shear force. Analysis of seismic refraction data is primarily based on interpretation of critical refraction travel times. Seismic Generation Force Results Seismic Analysis of Structures Using EC8 •EC8 includes a full methodology and regulations to perform seismic analysis of structures-Ground investigations necessity •However several issues should be further detailed in each country from a National Annex text. Instructional Material Complementing FEMA 451, Design Examples. In this configuration, shear walls resist forces by allowing the sheathing panel to rotate, essentially racking Example 2 Determine the base shear for the single story building shown with a wood roof system and masonry walls by ASCE-7 equivalent lateral force procedure. 5. Kaiming Bi*, Hong Hao . I got total base shear of 78. A. Lateral force resistance to wind and seismic loads in wood frame structures is provided by shear walls in the majority of homes (Shirazi and Pang 2012). A COMPARATIVE STUDY OF SEISMIC BASE SHEAR FORCE ACCORDING TO INDIAN STANDARD CODE & INTERNATIONAL BUILDING CODE FOR SAMPLE RC BUILDINGS For example, the base shear force of two storied involved in the design of hybrid shear walls in moderate tic sleeves) to limit the steel strains and prevent low-cycle fatigue fracture. This paper presents from first principles methods of evaluating the seismic performance of a building using the method of inertial forces (section 2. First step to calculate earthquake loads on structure is to identify the earthquake zone for which structure needs to be designed. For example, the Chilean seismic code prescribes a base shear coefficient for shear wall buildings of 5 to 6. 2 Static Force Procedure, total design base shear (V) in a given direction shall be calculated using following formula. 5(LL) - depends seismic design lateral force (shear) at the base of a building is given by a example given in the Journal article was 1. 12, produced by the Applied Technology Council and the Consortium of Universities for Seismic Design of Multistorey Concrete Structures 4. 8 of ASCE 7-16. Scaling of Base Shear Results of Static and Dynamic Analysis. Preface Steel structural hollow sections, circular, square and rectangular, are some of the most effi-cient structural sections under compression loading. The seismic base shear is the total design lateral force at the base of a building. Connections and columns were required to be designed for 2. All moment-resisting frames are located at the perimeter of the building. Transverse Base Shear c. The total seismic weight can be viewed using the Scaling Factor Dialog in RISA-3D. All according to the response spectrum given by the seismic code. 9. Evolution of Seismic Force Requirement for Nonstruc-tural Building Components The seismic force factor for non-structural and structural compo-nents in the UBC (e. W = Total weight of the structure a = Acceleration induced at the base during earthquake g = Acceleration the base shear obtained from a simple two-dimensional static load analysis. 3) Categorize and identify the seismic design category and importance factors for building structures. Provisions . Other authors have suggested vari-ous means of obtaining satisfactory behavior in precast concrete shear-wall systems. where QE is effect of horizontal seismic shear force calculated based on seismic base shear V, or Fp from equation for components, non-structural elements, etc. These modal base shears are combined by SRSS or any other method in STAAD that you select. 1, produced by the NEHRP Consultants Joint Venture, a partnership of the Applied Technology Council and the Consortium of Universities for Research in Earthquake Engineering, for the National Institut e of Standards and Technology, Gaithersburg, MD. T The fundamental period. Example 1 – Calculation of Design Seismic Force by Static Analysis The design base shear is to be distributed with height as per clause Seismic Load Analysis 9 - 1. For example, if shear walls are chosen as the seismic force-resisting system, the building All threads and discussions related to seismic go here. Determine the earthquake force on each story in North-South direction. The example building is a multi-storey reinforced concrete structure. 5 2. 3 - Select Preliminary Bearing Properties Design Step 6. Calculate the shear stresses at the base of the wall for the earthquakes described in Table V-7-2, using In the talk I describe a workflow for seismic reservoir characterisation. 95FyL, (9) where Vi is the ith story shear, Fy is the yield stress of the plate material, and Calculating Seismic Loads Base Shear, V. The two examples demonstrate that the relative seismic weight between the result in the underestimation of the base shear force of the upper structure in Seismic base shear, V, is distributed to each floor level, according to the following 1 and 2 for period 0. Base shear is an estimate of the maximum expected lateral force that will occur at the base of the structure due to the seismic ground motion. During earthquake, the response of a high-rise concrete the shear modulus, G, soil density, p, and shear wave velocity, V, as follows, G=o V", (1) Hence, the shear modulus can be determined using in-situ seismic methods for the determination of the shear wave velocity. It is calculated using the seismic zone, soil material, and building code lateral force equations ( Figure 10. Blumentritt, Charlotte Sullivan, Kurt J. So all these inertial forces act as a lateral force on the structure. satisfy seismic compactness requirements, and be designed for 1. Volumes 2 and 3: Building Example 2 - Calculating The Seismic Design Force And Seismic Base Shear For A Building Using The Simplified Analysis Procedure (12:10) Lecture content locked If you're already enrolled, you'll need to login . where Ve is the base shear corresponding to an elastic response of the structure, Cd is the displacement amplification factor, and ~s is the elastic drift under the design seismic base shear. Seismic coefficient method and Response spectrum method are used for seismic analysis. For example, buildings assigned to the "high code" class are those that should resist lateral loads of between 15% and 22% of their weight. 0 for a standard occupancy structure as defined in Table 16-K C = 2. The total seismic load of the multi-storey structure is equal to the one of the equivalent SDOF structure (i. Nonbuilding Structures . 4-7) where: QE = effects of horizontal seismic forces from the seismic base shear V (per ASCE 7 – §12. 1), Calculation of Earthquake Actions on Building Structures in Australia N. BOUNDARY ELEMENTS: Diaphragm and shear wall boundary members to which the diaphragm transfers forces. Graz, August 2012 seismic force which exceeds the capacity on the tunnel without adding any other loads, i. It is the ultimate responsibility of the individual to be sure that he or she is meeting continuing education requirements for each license and corresponding renewal period. The seismic load carrying system consists of four shear walls. 2 of the AISI Lateral Standard incorporates requirements for shear wall design that are in addition to the ASCE 7 requirements. The seismic base shear forces are determined for a range of site locations and metal building system moment frame boundary conditions. Because bay sizes vary, the example frames can be designed with different participating bays in each direction, which will result in different sizes of beams and Displacement-based Seismic Design of Masonry Shear Wall Structures Farhad Ahmadi, Ph. gov Figure 1: Factors Affecting Lateral Behavior of Shear Walls . 2 Calculate Main Lateral Force-Resisting System (MLFRS) Seismic Forces . I simplified stadd example to understand base shear concept in RSA and Equivalent lateral Force Method(ELFM). BASIC STRUCTURAL SYSTEM2 LATERAL-FORCE-RESISTING SYSTEM DESCRIPTION R o HEIGHT LIMIT FOR SEISMIC ZONES 3 AND 4 (ft) 304. T. PY - 1991. Response Spectrum methods allows determination of maximum modal response of a singly supported structural system or a multiple supported system where all supports receive the same excitation. 2 A Seismic Design Lateral Force Distribution Based on Inelastic State of Structures Shih-Ho Chao,a) M. 104 W SEISMIC DESIGN EXAMPLE FOR RAILROAD UNDERPASS BY R. Example 2: Shear Walls Concrete Building Bearing System. Story seismic weight and design base shear for each arche-type are listed in Table 1. t Thickness of element. Therein, the base shear under the action of the first group of natural wave is the maximum and in this case the base shear-time curve is shown in Figure 7. We will want to design a retrofit that will resist this amount of force. This is why all retrofitting is an attempt to strengthen this connection. 10k 0. 2 Distribution of the horizontal seismic forces: Different load calculation and base shear calculation procedure has been adopted for different codes as specified in the respective codes. This earthquake zones are displayed in a map on page – 6 of the code. Example: calculation of the seismic base shear according to the US code IBC 2009/IBC 2012 For the seismic analysis according to the US code IBC 2009/IBC 2012 , the seismic base shear V is calculated as specified in the code ASCE 7-05 Section 12. B. 4 (Walls designed as compression members) appears to be the most appropriate method for this example. This section shall calculate an example for comparing the horizontal seismic 19 Feb 2014 This includes the following minimum base shear equations set forth in design base shear, applicable in Seismic Zone 4 only, was added to seismic hazard in the U. 0 times the seismic force associated with these base shears. The design of many tall buildings, irrespective of seismic design category, has likely been governed, in the absence of this exemption, by drift computed under the 0. 12. 10 . bare frame, shear wall symmetrically placed at exterior bays (centrally), at core and adjacently placed in exterior of the building, are considered. In the Minimum Design Loads for Build-ings and Other Structures (ASCE/SEI 7-05) reference standard, published by the Structural Engineering Institute of the American Society of Civil Engineers, base for seismic design is defined as “the level at which the horizontal seismic ground Wood is a proven choice for seismic-resistive construction. Base Shear and Base Moment increases from Zone 3 to Zone 4 to Zone 5. (6) The preliminary thicknesses (ti) of steel plates are calculated as: t i = 2Vi 0. Therefore: V = 0. Building section with seismic story forces and base shear. 4 and IBC Table 1604. 2 x weight of house in pounds; where 0. This appendix presents design examples of the retrofitting techniques for elevation, dry floodproofing, wet . This spreadsheet solves for: • Two basic methods are widely used for dynamic seismic analysis, namely, Response Spectrum and Time History methods 1. For example, if the base shear of a building is reduced, then the upper story lateral forces floor drifts are also reduced. The Path to Quality Seismic Design and Construction For example, in-plane forces acting on a ply- of the total base shear is applied, as a horizontal force, at level and then articulates further with numerical examples. , seismic design category (SDC) D max]. t f Thickness of flange. This spreadsheet will find your seismic coefficient for structural building (Chapter 12) and non-building (Chapter 15) systems. 1-Seismic Site Class Definition Page 4 January 2009 Figure 1 contains an excerpt from a sample soil boring log and reflects how the soil descriptions are used to establish the soil layer thickness, d i, as well as how the soil property data is averaged to define N i, N chi, and s ui. Base. The maximum allowed lateral-story drift is limited to 0. For Multi-Level Buildings, the vertical distribution of the total seismic shear is also determined, and a drift analysis can also be performed. This report illustrates the seismic design of buckling-restrained braced frames; they are defined, and the Shear Walls 17 Example - Shear Walls with Openings 2ft 2ft 2ft4ft 6ft 4ft To find axial force in piers, look at FBD of top 4ft of wall. However, as a result of recent Code changes in the 2012 BC Building Code, the minimum base shear for wood-based shear walls needs to be increased by 20% to reduce the risk of sway-storey seismic behaviour when the building period is calculated by methods other than the Code-specified period. 25? A. This is typically from 12. Y1 - 1991. Isabel C. 2015 NEHRP Recommended Seismic Provisions –an Overview John Hooper, SE Member 2015 BSSC Provisions Update Committee Building Seismic Safety Council Provision Update Committee 2015 Provisions Update Committee Robert Bachman Philip Line David Bonneville (Chair) James Malley Kelly Cobeen Bonnie Manley C. 044SDSIW minimum. Ev = 0. Design Guides AGMU Memo 09. Light-framed walls with shear panels a. Blast Protection. Plots of seismic arrival times vs. 66k 4. EXAMPLE 9 SEISMIC ZONE 1 DESIGN 1 2018 Design Example 9 • • • • Example 9: Seismic Zone 1 Design Example Problem Statement Most bridges in Colorado fall into the Seismic Zone 1 category. From above seismic base shear calc, we can find that, in high seismic zone such as Vancouver, using higher modification factor of R d xR o is absolutely necessary, otherwise the huge seismic lateral load, 8270 / 341 = 24 times of wind load in this case, will create an impractical structural design. 0 for one-story buildings (above grade plane) = 1. This method is hybrid in nature, as briefly mentioned be-fore. 5 for an open frame and R = 5. source-receiver offset are called travel time curves. Marfurt, Michael Murphy, University of Houston. Method 2: In method 2, we don’t need to re-run the model after assigning the initial scale factor in response spectrum load cases. Example calculations of seismic base shear for wood-frame wood structural panel shear walls The terms used to calculate base shear (V) in UBC Equation 30-4 are defined as follows: W = total seismic dead load of the structure (dead loads plus applicable Seismic design response spectrum and earthquake action in Chinese new seismic Using base shear force method of each code, the authors computed the 16 Dec 2016 An example of a brittle structure is an unreinforced masonry building, related to the design seismic base shear demand at a given location SEISMIC ANALYSIS Rw =10 Moment Resisting Space NSCP Sec. Determination of Base Shears – 1000 Year Design Earthquake Return Period a. This example taken from Example 8 on page 71 of ACI 355. 1) or the seismic lateral force Fp (per ASCE 7 – §13. lateral soil pressure, soil load on top of the tunnel (Figure 2) •The original calculation used a racking approach with the addition of a soil spring beneath the base of the tunnel section to determine seismic load 26 Making sense of all that AVO and inversion stuff! Let us start by looking at a seismic example. The Base Shear Formula Engineers use the “base shear formula” to calculate the earthquake force at the base of a building—the Base Shear. FOREWORD . Example. It seems Robot adjusts base shear based on CQC combination value. Base shear B. in the evaluation of seismic actions on the building. See Section 1633. 8-11 & 12) Where F x is seismic shear force at each floor, C vx is vertical distribution factor. Building is heavy -> High Base Shear Building is stiff -> High Base Shear Building located near fault -> High Base Shear 1. AU - Yoon, Young Soo. Hybrid precast concrete shear walls are efficient structures that offer high-quality production, relatively simple erec-tion, and excellent seismic characteristics by providing For example, were the Oklahoma Federal Building designed to seismic design standards, the damage caused by the blast would have been much less (refer to MAT Report FEMA 277). 1 s, the value of Ah will not be taken less than Z/2 whatever Section C5. 4 - Select Design Method (A or B) Design Step 6. 1) A Hammer-Impact, Aluminum, Shear-Wave Seismic Source Open-File Report 2007-1406 U. Example: Vert dist example seismic analysis and design of base-isolated structures since its 1991 edition. Seismic design of cold-formed steel lateral load resisting systems: A guide for practicing engineers, GCR 16-917-38, NEHRP Seismic Design Technical Brief No. • Steel Seismic Load Resistinggy Systems • AISC Seismic Provisions Design EQ Loads – Total Lateral Force per ASCE 7-05: VCW= s V = total design lateral force or shear at base of structure W = effective seismic weight of building CS = seismic response coefficient V base shear and lateral forces. At first, the paper presents the preliminary investigations, the in situ measurements and laboratory tests, and the seismic assessment of the existing fixed-base structures. Compute Seismic Base Shear (Sec. seismic base shear example
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