Progressive Collapse Study of Seismically Designed Low Rise Reinforced Concrete Framed Structure

Abstract

In this study, linear and non-linear static analysis of low-rise models representing two-bay two-story and three-bay three-story reinforced concrete framed structures designed as per Indian standard codes (IS 450:2000 and IS 1893:2016 for the high seismic region using Envelope loading combination are assessed with and without the Guidelines of U.S. (GSA) General Services Administration. The purpose of this study is to describe the applicability of Finite Element software in assessing the behavior of seismically designed low rise structure before and after losing vertical structural element column with and without considering dynamic increase factor, and the results indicate demand resistance ratios acquired from elastic linear analysis and the hinge formation pattern obtained from non-linear elastic analysis are similar for Envelope loading combination and GSA loading combination, thus the dynamic increase factor of 2 recommended by the U.S. General Services Administration guidelines for static analysis can be underestimated for low-rise reinforced concrete framed models designed seismically as far as progressive collapse resistance is considered, since both types of loading combinations (in which one combination considers only normal design load path method while the other combination considers alternate load path methods) acquire same type of results, thus confirms seismically designed low rise models does possess inherent property towards progressive collapse resistance. This study provides a good example and summary for the construction industry and can be used by design engineers while designing low-rise progressive collapse-resistant structures.

Türkiye Bina Deprem Yönetmeliğine Göre Tasarlanan Betonarme Binaların İlerlemeli Çökme Davranışları

“…In the literature, Tsai and Lin [11] observed the effect of the seismic design on the PC resistance of reinforced concrete (RC) structures subjected to a column failure. That behavior was also investigated by Marchis et al [12] on the mid-rise and by Sheikh et al [13] on the RC framed structures. Abdulsalam and Chaudhary [14] evaluated the progressive collapse of RC buildings by defining flexure-axialshear interaction in plastic hinges.…”

“…However, it should be noted that since progressive collapse is not considered and evaluated explicitly, the PC risk of those buildings will never be abolished. Thus, special attention is still needed to design against extreme events [11]- [13].…”