Linear time history analysis of mdof structure by mode superposition method using newmarks. Design procedure of tabletop foundations for vibrating machines. What is difference between time history analysis and. It is an important technique for structural seismic analysis especially when the evaluated structural response is nonlinear. Results from time history analysis ethesis nit rourkela. In the case showed in th epicture below i am using modal decomposition method, but the results are so different from each other. Sep 19, 2017 export pdf files instead of printing at the time of design analysis of staad pro export pdf files instead of printing at the time of design analysis of staad pro. Timehistory is used to find the structural response under ground. Program calculates time periods for first six modes or as specified by the user.
This paper presents the dynamic time history analysis and response spectrum method of a concrete gravity dam by using staadpro. Analysis and design of turbo generator machine foundation. Analysis of framed machine foundation using time history analysis introduction to time history analysis analysis of turbine, pump foundation using time history analysis m. References are provided to other resources for the use of response spectrum curves, selection and scaling of ground motions, and definition of additional parameters required for the different nonlinear analysis types. The remainder of the words form a title to identify this project. Modal superposition in mode superposition analysis, it is assumed that the structural response can be obtained from the p lowest modes of the structure.
To perform such an analysis, a representative earthquake time history is required for a structure being evaluated. Program calculates sag for each mode utilizing time period and damping for each mode. Staadpro features state of the art user interface, visualisation tools, powerful analysis and design engines with advanced finite element fem and dynamic analysis capabilities. V8i for structures under seismic accelerations, analysis of a structure, applying data over increment time steps as a function of. Dynamic analysis may be performed either by time history method or by. Time history analysis is also known as nonlinear dynamic analysis. A research presents the dynamic time history analysis and response spectrum method of a concrete gravity. The time history response of a structure is simply the response motion or force of the structure evaluated as a function of time including inertial. Time line diagram introduction scope of work aim of project introduction of analysis and design design of structural elements beam column slab stairs footing shear wall problem definition plan of residential building analysis and design of building in staad. Pro crashing for dell laptop when browsing a file location. Model analysis find natural frequency of structure. In all cases conditions were observed to be satisfied. Timehistory analysis first steps tutorials computers and. In that report the displacements reported for a particular time step is that for a subsequent time step.
Us16 time history analysis for forcing function and ground motion. Test problems to demonstrate the differences and similarities between steadystate and timehistory analyses. It seems that staad uses also masses from load case 1 in modal analysis despite it is not clearly said in this example. Material data is not explicit in staad file so the differences in modal results may come from different material density 2.
With time, staad progress to create its own graphical environment, this was a major change for the staad users, as they were able to build their input file without the need to understand the. Test problems to demonstrate the differences and similarities between steadystate and time history analyses. Analysis engines for performing linear elastic and pdelta analysis, finite element analysis, frequency extraction, and dynamic response spectrum, time history, steady state, etc. A concrete gravity dam of different heights 70m, 90 m and 110 m model is prepared in staad pro to perform the time history analysis and response spectrum analysis. Pro is a structural analysis and design software application originally developed by research engineers international in 1997. Select define functions time history to define a time history function which characterizes load variation over time. Pdf today, tall structures have turned out to be overall engineering wonder. A response time history analysis can be used to calculate a structures response to time varying loads. Us29 time history analysis of a frame for seismic loads. Pdf analysis by staadpro and design of structural elements. And by using time history method for multistorey building the story displacement and story drift calculated. A concrete gravity dam model is prepared in staad pro to perform the time history analysis and response spectrum analysis and a comparison is done between both. One can save the time history of displacements in a text file from within postprocessing dynamics timedisp page, by right clicking on the plot and choosing the option save data in a text file.
Staad pro product data sheet staad, staad pro, civil. Pro advanced provides your engineering team with a scalable solution that will meet the demands of your project. The time history response of a structure is simply the response motion or. What is difference between time history analysis and response.
With an array of advanced analysis capabilities including linear static, response spectra, time history, cable, and. Elnashai, fundamentals of earthquake engineering basic information on dynamic analysis 15. Every staad input file has to begin with the word staad. Assign load conditions to the model through assign joint loads or frame loads. If you edit or modify your data file, you would need to edit the time history load case to reload the data. These manuals are normally provided only in the electronic format, with perhaps some exceptions such as the getting started manual which may be supplied as a printed book to first time and newversion buyers. Time history is basically a method of seismic analysis for the simulation of an earthquake motion. Pro a leading product in structural analysis and design. Advanced analysis and design with an array of advanced analysis capabilities including linear static, response spectra, time history, cable, imperfection, pushover and nonlinear analyses. A time history analysis method for studying the multi. It is an ultimate tool to study the dynamic response of a structure.
Time history analysis is performed using direct integration methods or by using fourier transformation technique. Us16 time history analysis for forcing function and. Time history analysis in staad pro v8i structures under seismic accelerations duration. Learn seismic analysis by seismic coefficient method in staad pro. Conclusions the rc turbine foundation has been effectively broke down by time history analysis utilizing staad pro.
Hi all, just have a couple of clarifications with regards to time history analysis in staadpro. So the correct giving similar results to staad modal definition in robot. Absolute responses blast loading finding amplitude of vibration large. In example 29 the acceleration time history is referred to an external file, i assumed that the external.
The time history response of a structure is simply the response motion or force of the structure evaluated as a function of time including inertial effects. Design engines for code checking and optimization of steel, aluminum and timber members. Comparison between response spectrum and time history. T08 time history suranaree university of technology.
Design of multistoried residential building using staad. Time history analysis ram staad bentley communities. This paper presents the dynamic time history analysis and response spectrum analysis of a concrete gravity dam by using staad pro. Nonlinear dynamic analysis it is known as time history analysis. Pro is one of the most widely used structural analysis and design software products worldwide. Pro advanced, which extends the scope of the standard version of staad. Export pdf files instead of printing at the time of design analysis of staad pro export pdf files instead of printing at the time of design analysis of staad pro. Comparison between response spectrum and time history method. This page contains a list of faqs related to time history analysis. Inclusion of static, dynamic, pdelta, nonlinear and cable analysis along with steel.
Models run in the new version should produce the same results as in the previous version, subject to minor. Comparative study of static and dynamic seismic analysis of a. This paper presents the dynamic time history analysis and response spectrum method of a concrete gravity dam by using staad pro. From the three dynamic characteristics of ground motion, which are pga. Create the model and assign support conditions to restrained joints. In the first case i showed to you i had used a newmark method for the time history analysis.
Broad spectra of design codes steel, concrete, timber, and aluminum design codes from all around the world including a number of historical codes means that you can take staad. May 25, 2017 time history analysis of structures is carried out when the input is in the form of specified time history of ground motion. Mar 27, 2019 time history analysis may be initiated using the process which follows. Pro, includes linear static, response spectra, time history, cable, imperfection, pushover, and nonlinear analyses. Reinforcement calculations for concrete beams, columns, slabs and shear. Structural analysis is the prediction of performance of a given. Pro v8i is the premier fem analysis and design tool for any type of project including towers, culverts, plants, bridges, stadiums, and marine structures.
Response spectrum analysis as per is1893 in staad pro. Time history displacements when saved in a text file from. Pro consists of a set of manuals as described below. The word space signifies that the structure is a space frame and the geometry is defined through x, y and z axes. What is difference between time history analysis and response spectrum analysis. The time history analysis method is also capability to. Learn to interpret the result which is utmost important part of learning. A time history is the advanced method of dynamic analysis. Aug 16, 2016 14 artificial time history acceleration matched to a code spectrum amr s. Why does this happen, and which ishould be most reliable one.