Analytical Studies on the Progressive Collapse Behaviour of 2D RC Frames with Different Grades of Steel

Progressive collapse is the structural failure whereas the initial failure occurs in the beam and column that results in a total failure of a structure, and one of the major failures that should be considered in a high-rise building is progressive collapse, in which minute damage occurs in an element like a beam or column that the local failure of a structure leads to a global one. It is a continuous chain of structural damage that leads to progressive collapse. In this present study, 2D two-bay 5-storey, 10-storey, 15-storey-reinforced concrete bare frame was analysed and their results were compared with different grades of steel such as Fe415, Fe500, and Fe550. A linear static analysis was carried out using finite element software for corner and middle column removal. Determination of demand capacity ratio (DCR) value for column and beam (axial force, bending moment, shear force), and displacement, was also determined to know the behaviour of progressive collapse of the structure. And the results show that moving to a higher grade of steel for analysis reduces the failure effect of the element when compared with the lower grade of steel and their values are checked according to the General Service Administration (GSA) guidelines.