Comparison of static pushover analysis and IDA-based probabilistic methods for assessing the seismic performance factors of diagrid structures

Abstract

The present study aims to reliably quantify the seismic response parameters of steel diagrid structural systems. To this end, in addition to the conventional Static Pushover Analysis (SPA), Dynamic Pushover Analysis (DPA) based on Incremental Dynamic Analysis (IDA) technique was taken into account. FEMA P-695 recommends a methodology for establishing Seismic Performance Factors (SPFs). The objective of the present study was to propose a simpler framework for estimating and validating SPFs while applying the concepts of FEMA P-695 guideline. The results showed that the R factors obtained through SPA procedure for steel diagrid systems were conservative and the IDAbased probabilistic method ensured a more rational value for the R coefficient. Furthermore, the proposed simplified method was in agreement with FEMA P-695 in predicting the collapse capacity of diagrid models.