Seismic evaluation of double-layer space structures (DLSS) using conventional and enhanced pushover analysis methods

Recent investigations indicate that pushover methods have been widely applied for the seismic evaluation of common structures, whereas a limited number of researches have conducted in the applicability of pushover analyses to double-layer barrel vault roofs with vertical double-layer walls. These structures will be called double-layer space structure (DLSS) throughout this article. The main goal of this study is the accuracy evaluation of pushover analysis in predicting the seismic demands of these structures. For this purpose, first mode pushover analysis, modal pushover analysis (MPA), N2 pushover, extended N2 pushover (EN2), consecutive modal pushover (CMP) procedures have been studied in different models with various rise-to-span ratios of roof and height-to-span ratios of wall. The maximum displacements, drifts, shears of models in different levels of studied models have been calculated and compared with incremental dynamic analysis (IDA) results. It is demonstrated that the extended N2 method is able to effectively predict the seismic demands of structures in comparison with other procedures.

کلیدواژه ها:

double-layer barrel vault roof ، modal pushover analysis ، extended N2 ، consecutive modal pushover ، incremental dynamic analysis