“Progressive collapse analysis of flat slab building in hilly terrain using Non-Linear Analysis: A study on bracing system as a structural Remedy”

Abstract

Progressive collapse is a term used to describe the failure of a structure, such as a building or bridge, due to the structure’s inability to reallocate the loads after the failure of a key component or portion of the structure. It is a cataclysmic structural failure that may occur when a primary structural member or a portion of a structure is damaged or fails, resulting in a string of structural failures that leads to the partial or complete breakdown of the structure. This research paper investigates the progressive collapse behaviour of an earthquake-resistant flat slab building lying in hilly terrain upon removal of the column at three different locations, using non-linear static analysis. The study involves the use of a finite element method-based software tool to simulate the collapse behaviour of the building. The results of the analysis indicate that the building lying in hilly terrain, designed to resist earthquake forces can be vulnerable to progressive collapse due to the abrupt removal of a crucial structural component and this can be significantly mitigated through the implementation of strategies, such as the provision of an alternate load path through the use of steel bracing systems. Evaluation of the outcomes is done in terms of vertical joint displacements at the top of the deleted column and the formation of plastic hinges in the adjacent structural members. The findings of this research paper provide valuable insights into the progressive collapse potential of a flat slab building designed for earthquake loads, in hilly terrain under extreme loading conditions. The results can be used to inform the design and construction of buildings that are more resilient and robust to extreme events, thereby lowering the possibility of progressive collapse and ensuring the safety of the occupants.