Abstract
The conventional pushover method has 2 major drawbacks, it cannot account for the higher mode effect and do not consider the change in lateral load pattern when the structure reaches its inelastic phase. To overcome those limitations, in this research will present the Adaptive Force-Based Multimode Pushover Analysis (AFMP) method, in this method the higher mode effect, and the change in lateral load pattern have already been considered. This research will compare the result of evaluation using triangular and uniform load pattern with the AFMP load pattern using 1, 2, and 3 modal pairs towards its effects on non linier seismic behaviour of a building with the first mode being not dominant. The analysis resulted that using the AFMP method yields to a higher seismic response on the upper floors, caused by the higher being considered in the analysis. The triangular load pattern, resulted in smaller seismic response on all stories than the AFMP method, while the uniform load pattern tends to overestimate the response on the lower floors. Based on the performance criteria of FEMA 356, the conventional pushover resulted in Life safety performance level, while the AFMP also resulted in Life safety performance level.
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