Seismic Assessment of Three RC Buildings Using Pushover Analysis Method

Abstract

The study highlights the effectiveness of pushover analysis in assessing structural performance and ensuring safety under seismic conditions. To achieve this, the study employs numerical modeling to analyze the structural behavior of reinforced concrete (RC) buildings under seismic hazards, utilizing nonlinear static analysis methods. Based on the validation of previous empirical and theoretical studies, this study created three-dimensional finite element models using the CSI-ETABS V.19.1.1 software. The study also addresses the limitations of the Egyptian Code for Loads (ECP-201), which lacks provisions for nonlinear static analysis. To overcome this, the pushover analysis technique, a nonlinear static method known for its accuracy in predicting structural performance and identifying plastic hinge locations, is applied. The analysis evaluates RC frame buildings of 15, 20, and 25 stories designed according to ECP-201 and compares the results with standards from ATC-40, FEMA-356, and FEMA-440. The findings indicate that these buildings can sustain seismic base shear ranging from 65% to 85% of their ultimate capacity, as determined by pushover analysis in both X- and Y-Directions.