PROGRESSIVE COLLAPSE ANALYSIS OF RCC BUILDING

Abstract

Progressive collapse of a structure occurs when a local elemental failure activates successive failure leading to either partial or total collapse of the structure. Prevention of progressive collapse in a structure is a significant issue in the improvement of several design codes. To control successive elemental failures, it is significant to study structural elemental behaviour under removal of column at critical locations. In this project, progressive collapse analysis have been done using a finite element linear static and non linear static anlysis on a 6 storey building. Though there are dynamic methods also for analysis but static method has been used owing to its practicality and simplicity in engineering world. Dynamic method is more complicated and involves number of iteration before it can give any close to accurate result, hence is not much in demand nowadays. The work focuses on progresive collapse analysis of RCC structure under column removal using commercially available computer program ETABS. A G+5 RCC flat slab building is modelled as per Indian standard and analysed using two important methodologies. The results of linear static analysis have been stated in the form of DCR and the results of non linear static analysis have been stated in the form of support rotation at joints. In both the cases, the structure is not susceptible to progressive collapse both when the central column is removed and also when corner column is removed. The critical coloumns were removed to trigger progressive collapse.