Progressive Collapse Analysis of Steel Building with Bracing

Abstract

Progressive collapse is a disastrous structural event that occur because of human-made and natural hazards. Damage
can be in form of loss of non-structural element, structural components and collapse of structural element leading to progressive
failure of part or whole building. The failure of a member in the primary load resisting system leads to redistribution of forces to the
adjoining members and if redistributed load exceeds member capacity it fails. This process continues in the structure and eventually
the building collapses. The present work investigates the effect of concentric bracing on the progressive collapse potential of steel
building. Linear static analysis of building model with and without bracing are carried out using the alternate path method
recommended by the General Service Administration (GSA guideline) using software SAP2000. The building model would be of 8
storey steel building which includes X type bracing system with different arrangement. The X types of bracing system is evaluated with
two different arrangement of bracing to get maximum resistance from Progressive Collapse. The demand capacity ratio of building is
evaluated by GSA guidelines and is compared with different models which include building with and without bracing. Effect of
removal of columns at different locations which include forces and moments are studied and compared. The study shows that moment
frame with concentric bracing exhibited desirable resistance against progressive collapse.