Evaluation of Progressive Collapse Potential for Multi Storey Regular and L-shaped RC Framed Structure with Static Linear and Static Nonlinear Method

Abstract

A local structural damage of primary load carrying element, causing the collapse of adjoining members initiates chain reaction mechanism which leads to failure that is disproportionate to the initiating local damage, is known as Progressive Collapse. In today’s fast growing infrastructure trend, it is necessary to accommodate the most unfavorable situations in structure design for important structures. Presently researchers and engineers are studying structural performance during extreme deformations, systems to resist disproportionate collapse, and methods to analyze collapse potential. The U.S. General Services Administration (GSA) document provides the general guidelines to assess the potential for progressive collapse in RCC and Steel buildings. In present study, G+10, multi storey Reinforced Concrete (RC) framed structure is analyzed using Linear Static and Nonlinear Static method as specified in GSA guidelines and potential for progressive collapse is evaluated. Analysis results are compared for different geometric parameters considering, regular and L-shaped plan geometry. Buildings are designed as per the Indian Standard guidelines for gravity and seismic load. Design and progressive collapse analysis is carried out using computer program ETABS Nonlinear version 9.5. Analysis results identify one of the most critical column removal conditions out of four mentioned in GSA guidelines. Results of static nonlinear analysis indicate that for the facilities up to G+10 also, nonlinear analysis is a must. Study also proves the need of nonlinear analysis in case of irregular building.