Parametric evaluation of pushover methods in irregular 3D RC structures under multicomponents seismic loading

Because of its relative simplicity and less computing costs، Pushover analysis، gains a supremacy over nonlinear time history analysis in structural engineering communities. Researchers conducted several 2D pushover methods that their efficiency in real 3D structures should be evaluated. In this research the proficiency of common pushover analysis procedures to predict the response of 3D in-plan Irregular reinforced concrete frames has been evaluated. Several RC frames with different in-plan Irregularities and heights was analysed using conventional pushover analysis with rectangular and triangular loading scheme، modal pushover and forced-based adaptive pushover analysis. Comparing results with bi-directional nonlinear dynamics analysis using ordinary and near-fields seismograms indicate that although the multi-procedure approach can present a better picture of the structural response of 3D RC frames، the more advanced procedures in contrast to other procedures، on the average، have higher achievements on predicting nonlinear behaviour of such structures.