Lourenco 10 graphic statics the arch is first decomposed in a series of real or fictitious voussoirs separated by a series of planes the planes do not need to be parallel the thrust line is defined as the geometrical locus of the points of. Comparison between response spectrum and time history method. Introduction time history dynamic analyses of structures for problems with large number of degrees of freedom, is time consuming. For this structure, a damping of 5 percent of critical was specified. Csi analysis and reference manual for sap2000, etabs and safe 2.
Nonlinear time history analysis obtains the response of the structure in which any nonlinear elements have been defined. Sap2000 is a structural analysis and design software. You can display results of time history analysis as diagrams, maps or structure deformations. Time history analysis diagrams robot structural analysis. Staadpro to perform the time history analysis and response spectrum analysis. How can add the blast load using time history function in. In this paper a nonlinear dynamic analysis is performed on gravity dam. Minimum number of accelerograms for timehistory analysis of. Null steps happen is nonlinear analysis as when the elements go beyond the yield point, they start losing stiffness. For this purpose, click onassign, joint, and masses to get the following screen.
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 of structures is carried out when the input is in the form of specified time history of ground motion. For timehistory analysis, sap2000 allows an explicit damping ratio to be used in each mode. Is there a way to reduce the null steps of time history. Time history is basically a method of seismic analysis for the simulation of an earthquake motion.
Directintegration timehistory analysis is a nonlinear, dynamic analysis. Time history analysis consists in reaching a solution of the following equation of the t time variable. Overview of the procedure for timehistory analysis. Ground motion at specific supports manual multisupport excitation. There are basically three methods for seismic analysis. Nonlinear time history analysis of tall structure for. The accuracy of fna depends upon the sufficiency of suitable mode shapes, similar to how direct integration requires small enough time steps to accurately characterize. Here, i will introduce a matlab function which can do a time history analysis of an ndof structure with a certain number of modes nom. V8i for structures under seismic accelerations, analysis of a structure, applying data over increment time steps as a function of. Timehistory analysis faq technical knowledge base computers. Sap2000 is a general purpose finite element program which performs the.
Oct 09, 2016 sap 2000advanced training time history analysis. Nonlinear time history analysis of concrete gravity dam by. Time history analysis in sap2000 structural analysis software. Finite element has been widely used in the analysis of concrete gravity dams with a defined approach as presented in this paper. Event information such as le timestamps, log les and web browser cache and history is collated into a supertimeline 1, with events corroborated from multiple sources. Timehistory analysis of floor vibration the newmark direct integration method is adopt for timehistory analysis, where the parameters could be. And then in virtue of the finite element software sap2000, the nonlinear dynamic analysis to the steel structural tower under the time history wind load was made to gain the time history displacement, time history velocity and time history acceleration. It has been widely used in recent years on the evaluation of the seismic vulnerability of bridges.
May 01, 2016 print or save tabular data to access, excel, word, html, or text. The load optimizer is a tool in sap2000 to compute the optimal. Department of civil and environmental engineering california. Learn about the sap2000 structural analysis and design program. Timehistory with sap2000 databases function mathematics. Dec 10, 2014 civilax on analysis and optimization of prismatic and axisymmetric shell structures.
As we know sap2000 is the most convenient and less tedious for any nonlinear dynamic analyses. Linear time history analysis is performed instructural analysis and d esign staad pro software. Nonlinear time history analysis is an effective tool for performance based evaluation of a structure. Theory, practice and software about us civilax based to server in civil engineering provides etabs and sap2000 tutorials, civil engineering spreadsheets, civil engineering ebooks and many more civil engineering downloads. Timehistory analysis first steps tutorials computers. 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. You can draw diagrams for the envelope or for each of the time components. Investigation of multistory building subjected to blast load. Timehistory analysis technical knowledge base computers and. Therefore, the program must have information about the force as a function of time applied to the structure and the structures damping in order to solve the dynamic analysis.
Sap2000 a stepbystep guide for bengmengmsc students familiarizing with this piece of software. The research of timehistory response analysis of floor. Example i general modeling techniques 2d shear wall analysis. Minimum number of accelerograms for time history analysis of typical highway bridges kang huang time history analysis is the most reliable method for the assessment of the behaviour of bridges subjected to seismic loads. Directintegration timehistory analysis technical knowledge base. 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. Sap2000 is a structural analysis and design software produced by computer and structures, incorporated csi, a structural and earthquake engineering company. Select define functions time history to define a time history function which characterizes load variation over time. My time history is in msec2 and im undecided if insert a scale factor 9,81ms2 or 9,81peakgroundaccelerationms2 excuse me for the stupid request, but there isnt a specific manual for sap2000 in my originally language.
The proposed method is to study the response of low, mid, and high rise. Investigation on dynamic response of steel tower structure. What value of scale factor should i use to define a timehistory load case. Linear static, linear dynamic and non linear static paulo b. Response spectrum analysis provides insight into dynamic behavior by measuring pseudospectral acceleration, velocity, or displacement as a function of structural period for a given time history. Csi analysis reference manual linear timehistory analysis, page 353 and 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. For the love of physics walter lewin may 16, 2011 duration. Time history analysis is performed using direct integration methods or by using fourier transformation technique. Optimized modeling and design of structures using sap2000 presented by. In the nonlinear timehistory analysis, an incrementaliterative scheme based on. Csi etabs 21 time history analysis scale factor discussed.
Jun 11, 20 nonlinear modal time history analysis, also known as fast nonlinear analysis fna, is generally more accurate and efficient than directintegration time history analysis. In order to overcome this difficulty, wavelet transforms wt are used. Comparison between fna and directintegration timehistory. The structural structural analysis and design software csi produce include sap2000, csibridge, etabs, safe, perform3d, and csicol. Sap2000 is a registered trademark of computers and structures, inc. Initial conditions may be set by continuing the structural state from the end.
Time history analysis stressed civilenvironmental 18 nov 11 12. Nonlinear inelastic timehistory analysis of threedimensional semi. Incomputerforensics, timeline analysis isthecollation oftimestampsandotherevent information into an account of what occurred on the computer. Timehistory analysis first steps tutorials computers and. This tutorial demonstrates the modeling of vibrating machinery and its connection to a steelskid structural system. Linear dynamic analysis response spectrum method is the linear dynamic analysis method. The units should be consistent with the units specifed for youe analysis. Time history analysis in sap2000 structural analysis. Nonlinear time history analysis robot structural analysis. Timehistory analysis provides for linear or nonlinear evaluation of dynamic structural response under loading which may vary according to the specified time function. Rayleigh damping is proposed, and the damping ratio of the first and second mode is taken as the value of 0. After selecting the main case, the results of a single component with particular time steps become available.
Nonlinear dynamic analysis it is known as time history. 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. V8i for structures under seismic accelerations,analysis of a structure, applying data over increment time steps as a function of. Check the base shear produced due to the time history analysis. Sep 10, 2014 this document constitutes the teaching material of the course structural analysis program sap2000 to which has been given since march 2010 date of 1st edition in the ets engineers roads, canals and ports of the university of granada through the general foundation university of granadaenterprise. Deformation cable supported bridge analysis and pushover analysis. Assign load conditions to the model through assign joint loads or frame loads. Create the model and assign support conditions to restrained joints. In that method the peak response of structure during an earthquake is obtained directly from the earthquake response, but this is quite accurate for structural design applications duggal, 2010. What is difference between time history analysis and. From a simple small 2d static frame analysis to a large complex 3d nonlinear dynamic analysis, sap2000 is the answer to all structural analysis and design needs. Time history analysis may be initiated using the process which follows.
96 775 271 749 686 156 266 1134 1256 974 1426 1202 1261 46 1467 904 767 79 54 1394 358 692 204 108 117 1221 1401 1505 1417 805 1015 629 1022 244 1129 1241 1026 527 1105 1329 1376 483 313 814 142 927 1484 809