Comparison of nonlinear static analysis of Iranian standard 2800 with ASCE/SEI 41-13 in intermediate MRF RC buildings

Abstract

One of the simplified methods, which is progressing and completing every day, is a nonlinear static analysis that can directly evaluate the performance of a structure in any limit state and provide information about the nonlinear behavior of the structure, and it also does not have the complexity of nonlinear dynamic analysis. In this study, the structural responses of nonlinear static procedure (NSP) based on standard 2800 were compared with ASCE 41-13 code and displacement -based adaptive pushover (DAP) method in three models of reinforced concrete structures including the 3, 7 and 10 story with medium ductility. In order to study the accuracy of nonlinear static analysis and seismic behavior of structures, nonlinear time history analysis (NTHA) which is the most accurate method in seismic assessment of structures was conducted.The results show that in 3 and 10 story the NSP according to standard 2800 with forces distribution obtained from the spectral dynamical analysis is more accurate than other NSPs in evaluating of story drifts ratio and maximum displacement along the height of buildings. In 7 story, displacement -based adaptive pushover (DAP) method can be estimated story drift ratio more precisely. In 3 and 10 story, the NSP based on 2800 with forces distribution obtained from the spectral dynamical analysis, can estimate the mean story drifts with a lower percentage error. According to the results, in each three model the uniform distribution of nonlinear static procedure (NSP) based on standard 2800 estimates the story drifts with less accuracy and high error. As a suggestion, nonlinear static analysis based on uniform distribution can be eliminated from the standard 2800.

Keywords

• nonlinear static analysis
• nonlinear dynamic analysis
• adaptive pushover
• nonlinear time history analysis
• reinforced concrete structure