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.
The aim of this study is to investigate the behavior of low-rise, four-story RC framed structures when subjected to abnormal loads, specifically missing column scenarios. The study uses more than 20 unique models with varying beam and column cross sections and designs them for India's four seismic zones (Z2, Z3, Z4, and Z5) in accordance with IS 456–2000 and IS 1893–2016 using FEM based ETABS V.17 Software. The study evaluates the potential for progressive collapse of structures in all three possible cases of column removal, as per the GSA (2016) Guidelines, using the linear static analysis approach. The investigation aims to determine the progressive collapse potential of low-rise reinforced concrete framed structures designed for Indian seismic zones, and the effect of different beam and column cross sections on the structures' progressive collapse potential. The study finds that structures designed for high seismic zones (seismic zone 5 with high beam column cross sections) have greater progressive collapse resistance, while those designed for low seismic zones (seismic zone 2 with low beam column cross sections) have lower resistance. The study also analyzes and designs the structural models for seismic loading and examines the behavior of critical columns (flexure) after column missing scenarios by studying the column interaction diagrams for GSA load-generating internal forces. Additionally, the study quantifies the notable effect on the material quantities (Concrete and longitudinal reinforcement), as they have a significant influence on the ductility and flexibility of the frame behavior.
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