COMPARATIVE STUDY OF PROGRESSIVE COLLAPSE ANALYSIS OF FLAT SLAB BUILDING WITH AND WITHOUT SHEAR WALL

Divya N, Gururaja B, R Sridhar

Abstract: The progressive collapse of building occurs when one or more vertical load carrying structural elements like columns are removed. Once a column is removed due to an extreme loads generated either by natural hazard such as earthquake or by manmade like gas explosions, terrorist attacks, impact by vehicles etc. the weight of the structure transfers to neighboring columns in the structure. The present analytical study investigates failure criteria and potential of structural collapse of irregular R.C frame building having flat slab with and without shear wall. The column and shear wall has been removed at three different identified locations and spread of damage is evaluated. The progressive collapse study has been done for the each case by removing shear wall and column at identified critical locations as per GSA (2003) guidelines. Static analysis is performed using structural analysis program ETABS nonlinear version 9.7.4. For each case the results have been taken in terms of demand capacity ratio (DCR) at critical sections and thus, the structure has been assessed for it’s susceptible to progressive collapse. The results showed existence of shear wall in the building makes it resistive to progressive collapse under loss of vertical load bearing element by providing sufficient stiffness and load paths for gravity loads.

Keywords: Column removal, linear static analysis, Progressive collapse, Demand Capacity Ratio (DCR), Flat slab, Shear wall

DOI: https://doi.org/10.15623/ijret.2016.0532044