Progressive collapse of a reinforced concrete frame structure
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Date
2019
Journal Title
Journal ISSN
Volume Title
Publisher
UMT.Lahore
Abstract
Progressive collapse is the ultimate failure in an element of a structure due to spread of local failure from element to element throughout the structure. Progressive collapse analysis of a reinforced concrete frame structure was performed using commercial software ETABS v. 16. A five story building was selected and designed under gravity loads as per Pakistan Building Code
(PBC). Analysis for progressive collapse were made under two damage cases; edge column damage and corner column damage according to General Services Administration (GSA) guidelines. Linear static analysis was carried out on Corner and Edge column damage cases under fully (100%) and partially (80%) damages scenario. The results include bending moment
diagrams, demand to capacity ratios (DCR) and deflection at critical members in cases with 80% and fully damage consideration. Structural member having DCR value greater than 1.5 shows severe collapse potential according to GSA guidelines. It is concluded that edge column with longer bays is found critical in the event of progressive collapse because the bays with longer span experiences more damage as compared with smaller
span bays. As a result of it collapse will occur in short period of time and there is upsurge possibility of loss of lives under such condition of structures. Based on this research, practicing engineer should assimilate the GSA guidelines for loading along with the other loads so that potential for progressive collapse may be lessen up to some extent.