Effects of Retrofit Strategies on Mitigating Progressive Collapse of Steel Building

Abstract

Progressive collapse is the collapse of large part of a structure resulted by damage or failure of a relatively small part of it. Designing the buildings to resist progressive collapse is uneconomical due to intense loading effects associated with these hazards. There is an increasing trend of upgrading public buildings to resist progressive collapse caused by accidental loading Uke blast, vehicle colUsion, fire, earthquake etc. In this paper, different retrofit strategies to enhance the response of 4-storied steel moment resisting building is investigated using recommendations of the General Services Administration (GSA) guideline for resisting progressive collapse. The response of building to progressive collapse is evaluated using Unear and nonUnear analysis. The building is subjected to different ground floor column loss scenarios. The response of the structure is evaluated when retrofitted using three approaches namely, increasing the strength of the beams, increasing the stiffness of the beams, and increasing both strength and stiffness of the beams.