The advantage of these linear dynamic procedures with respect to linear static procedures is that higher modes can be considered. Sap2000 rigorously analyzes geometric nonlinear effects of p. Sap2000 can also analyze seismic cases using linear or nonlinear time history dynamic analysis. We need to input the accelerogram as a generic function defined in sap2000 starting from a txt file. This chapter presents two examples that focus on the dynamic analysis of steel. In addition to small displacement pdelta, sap2000 is also able to analyze pdelta with large displacements under static and time history loading sap2000 modal and eigen buckling analysis cases can be based on the stiffness and boundary conditions from one or more static nonlinear pdelta cases in. I am modelling a 3 d 10 storied steel structure building for seismic loading. We are committed to delivering uninterrupted software services worldwide during the covid19 crisis. May 26, 2009 time history seismic analysis with sap2000 a stepbystep guide for bengmengmsc students familiarizing with this piece of software slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising.
Time history analysis is performed using direct integration methods or by using fourier transformation technique. A concrete gravity dam model is prepared in sap 2000 to perform the time history analysis. Jun 29, 2015 seismic analysis of a asymmetrical building in sap2000. Seismic time history sap2000 civil engineering community. Nonlinear dynamic analysis it is known as time history analysis. Jun 30, 2015 civilax based to server in civil engineering provides etabs and sap2000 tutorials, civil engineering spreadsheets, civil engineering ebooks and many more civil engineering downloads.
Nonlinear time history analysis of concrete gravity dam by. Sap2000 is generalpurpose civilengineering software ideal for the analysis and design of any type of structural system. Time history analysis of structures is carried out when the input is in the form of specified time history of ground motion. It is an important technique for structural seismic analysis especially when the evaluated structural response is nonlinear. List of content download recorded accelerograms from the peer database upload a selected accelerogram to sap2000 run the time history analysis and display the results.
Directintegration timehistory analysis is a nonlinear, dynamic analysis. Comparison between response spectrum and time history method. Acceleration loads are explained further in the csi analysis reference manual chapter xvii. To perform such an analysis, a representative earthquake time history is required for a structure being evaluated. Software used for analysis is finite element based software sap2000. I have tried it with both auto and manual hinges at calculated plastic hinge. Linear time history analysis is performed instructural analysis and d esign staad pro software. Fast non linear analysis fna and direct integration.
In most cases keeping the input and output time steps the same size produces the most information. The input files for the programs used, the history of the seismic. Comparison between response spectrum and time history. For timehistory analysis, sap2000 allows an explicit damping ratio to be. The recent increase in the speed and capacity of personal computers has made it practical to run many time history analyses in a short period of time. Sap2000 multipendulum model newtons cradle model a pendulum system in sap2000 using largedisplacement time history analysis. For either modal or directintegration timehistory analysis, sufficient output.
Sap2000 a stepbystep guide for bengmengmsc students familiarizing with this piece of software. Nonlinear time history analysis is used on both of fixed base and base isolated buildings. A reduced number of lanes for normal traffic is available within three months of the earthquake. Time history seismic analysis with sap2000 a stepbystep guide for bengmengmsc students familiarizing with this piece of software slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Finite element model in sap2000 in sap2000 plain stress elements are used to build the finite element model of the liquid storage tanks. In sap2000 basic and advanced systems, ranging from 2d to 3d, of simple geometry to complex, may be modeled, analyzed, designed, and optimized using a practical and intuitive objectbased modeling environment that simplifies and streamlines the engineering process. Mar 11, 2014 the seismic input is modelled using either modal spectral analysis or time history analysis but in both cases, the corresponding internal forces and displacements are determined using linear elastic analysis. Therefore, dynamic analysis methods forestimating the response of a concrete gravity dam plays an extraordinary role.
Using sap2000 for pushover analysis we will use the same frame elastic beams, just modify dead loads. Type a and b were manually designed as per the axial loads and properties. Responsespectrum analysis rsa is a lineardynamic statistical analysis method. From a simple small 2d static frame analysis to a large complex 3d nonlinear dynamic analysis, sap2000 is the easiest, most productive solution for your structural analysis and design needs. Time history analysis in sap2000 structural analysis. The building under consideration is modeled with the help of sap200015 software. Operational modal analysis, model updating, and seismic.
I have defined a nonlinear dead load case and wanted to add load type as load pattern and load. The 2d fem model that is built is as shown in fig2. Sap2000 is capable of applying acceleration time history to the. Stepbystep time history moving load analysis technical. Non linear inelastic time history analysis in sap2000. Initial conditions may be set by continuing the structural state from the end. What value of scale factor should i use to define a timehistory load case. Finite element has been widely used in the analysis of concrete gravity dams with a defined approach as presented in this paper. Ground motion at specific supports manual multisupport excitation. Five different time histories have been used considering seismic intensities. Staadpro to perform the time history analysis and response spectrum analysis. Time history analysis provides for linear or nonlinear evaluation of dynamic structural response under loading which may vary according to the specified time function.
Using sap2000 software package in earthquake engineering. Application of nonlinear static pushover procedure to the. Civilax based to server in civil engineering provides etabs and sap2000 tutorials, civil engineering spreadsheets, civil engineering ebooks and many more civil engineering downloads. Sap2000 api using matlab time history analysis newtonthegreat civilenvironmental 24 jun 11 14. With the help of sap2000 nine story building frame has been analysed for seismic loads without damper and with damper linear as well as nonlinear time history analysis has been done. Wilsons text static and dynamic analysis of structures. Limited service bridge is open for emergency vehicle traffic. Time history analysis of building frame sap is structural analysis programming software. Timehistory outputacceleration accuracy technical knowledge. Apr 24, 2016 csi etabs, safe, sap2000 analysis files extensions civil engineering community from.
The study involved carrying out dynamic analysis using sap2000 nonlinear computer software on a threedimensional model of the original as well as the retrofitted structure. When an acceleration record is specified for timehistory analysis. Time history is basically a method of seismic analysis for the simulation of an earthquake motion. Time history analysis is carried out in order to evaluate floor response, accelerations and displacements during a. This paper presents the dynamic nonlinear time history analysis of a concrete gravity dam by using csi sap 2000. Chopra ak, goel rk 2002 a modal pushover analysis procedure for estimating seismic demands for buildings.
Seismic retrofitting study on an industrial building in. Introduction time history dynamic analyses of structures for problems with large number of degrees of freedom, is time consuming. You should consider starting with larger time steps at first to reduce analysis time while calibrating the model, then reducing the time steps until the response of interest does not significant change anymore. What is difference between time history analysis and. I am trying to do a time history analysis of a buckling restrained braced frame brbf using sap2000. For time history analysis sap2000 provides two options namely modal i. The proposed method is to study the response of low, mid, and high rise reinforced concrete buildings under low, intermediate, and high frequency content ground motions. I need to place dampers in the structures and the responses of the building are of critical importance. Goel, a modal pushover analysis procedure for estimating seismic. It is a cablestayed bridge consisting of 288 cables, two approach spans made of concrete box girders and precast deck panels, and a main span consisting of steel girders and cross beams with precast deck panels. A time history analysis uses the mass, stiffness and damping matrices to solve for the forced vibration of the structure due to an applied load that varies with time.
I am in a dilemma regarding which one to use for the analysis. Seismic retrofitting study on an industrial building in aqaba. Time history analysis in sap2000 structural analysis software. Seismic analysis of a asymmetrical building in sap2000. List of content download recorded accelerograms from the peer database upload a selected accelerogram to sap2000 run the timehistory analysis and display the results. Seismic analysis o f multi storey rc buildings supported on single and combined base. In the absence of a predominant mode in the direction of the analysis leaving aside for the time being the issue of simultaneous application of earthquake actions in both principal directions one can in principle, apply modal pushover analysis 10 a. The seismic responses of 14 storied reinforced concrete structure. Sap2000 api using matlab time history analysis computers. The best way is to only display the results of the nodes in the corners and in the center of gravity to find the maximum difference in the total displacement see. Seismic assessment of a rc building according to fema 356.
Aug 12, 2011 the interactive transcript could not be loaded. Timehistory analysis technical knowledge base computers. For seismic design, these maximum stresses are of interest, not the time history of stress. Seismic analysis of fixed based and base isolated building. Response spectrum method of analysis with simplified. Timehistory analysis faq technical knowledge base computers. Displacement timehistory record technical knowledge base. Dynamic analysis of both models has been performed by etabs nonlinear version 9. Directintegration timehistory analysis technical knowledge base. Aqaba earthquake, peak ground acceleration, seismic retrofitting, structural analysis, shear walls, time history.
Sap2000 is capable of applying acceleration time history to the fem model. There are basically three methods for seismic analysis. The finite element model was chosen to satisfy the needs of this analysis. What is difference between time history analysis and response. The port mann bridge is currently one of the longest cablestayed bridges in north america and the second widest bridge in the world. Non linear inelastic time history analysis in sap2000 non linear inelastic time history analysis in sap2000 samtronbn civilenvironmental op 22 jun 12 15.
Responsespectrum analysis is useful for design decisionmaking because it. Equivalent lateral force for an earthquake is defined as a set of lateral force which will produce the same peak response as that obtained by dynamic analysis of structures. The equivalence is restricted to a single mode of vibration. Section designer sap2000 section designer sd comes integrated with every sap2000 license, and calculates cross sectional properties and moment curvatures of irregular and builtup sections modeled as a framebeam element. Response history analysis of structures with seismic. Chapter 4 seismic design and retrofit page 42 wsdot bridge design manual m 2350.
Learn about the sap2000 structural analysis and design program. Nonlinear dynamic analysis of masonry buildings and. Jul 21, 2014 chopra ak, goel rk 2002 a modal pushover analysis procedure for estimating seismic demands for buildings. The dynamic responses of fixed base and seismic isolated models have been calculated for four types of real earthquake time histories of different. As stated in the csi analysis reference manual time integration. Nonlinear analyses can be static andor time history, with options for fna nonlinear time history dynamic analysis and direct integration. Nonlinear time history analysis of tall structure for. The analysis is carried out using nonlinear time history analysis in finite element software sap2000. Sap2000 seismic analysis civil engineering community. Determination of story drift according to asce 716 under. Nonlinear time history analysis of concrete gravity dam.
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