Performance of multistory building under nonlinear static push-over

Abstract

Analysis methods such as pushover and time history analysis are acceptable to check out the behavior of buildings design by codes. Pushover analysis classified within the simplified nonlinear seismic static analysis. The benefit of this analysis is to evaluate structural elements under the effects of seismic demands imposed by ground motion. Time history as dynamic linear analysis is an accurate approach to apply as acceleration as function of time. Ground plus three stories reinforced concrete building was adopted in this research to check out the effects of pushover analysis and linear time history loadings on the performance of all structural elements, which were designed without the presence of these analysis, under the effects of wind, gravity, and seismic loadings by equivalent lateral force that suggested by ASCE. The prototype building is simulated using finite elements approach by SAP2000 package using worst loading combination such as dead, live, wind and seismic loadings. The adopted loading requirements such as wind and seismic loads are based on the Iraq topography. The capacity spectrums based on ATC-40 with the spectral displacement and different values of site location are taken into accounts, and the El Centro 1940 in case of linear time history. The results for different values of site locations and performance points were discussed in case of pushover analysis and compared with that of same site locations of the analysis of time history. Based on the analysis results the shear and displacement increased as magnitudes of site location increased.