PROGRESSIVE COLLAPSE ANALYSIS OF RC BUILDINGS ON HILL STATION BY USING NON-LINEAR DYNAMIC ANALYSIS

Abstract

The loss of catenary action in reinforced concrete structures caused due to the progressive collapse which is the collapse of all, or a large part of a structure precipitated by damage or failure of a relatively small part of it. In this project, it is proposed to carry out progressive collapse analysis of G+3 storey RC frame building with Non-Linear Dynamic Analysis on normal and varying ground slopes of hill stations, mainly 100 ,150 and 200 with the help of methodology mentioned in GSA 2003 guidelines. Reinforced Concrete Building consisting of 5 X 5 bay of 5 m each in both directions have been taken and designed by Indian Standard codes as a special moment resistant frame. Different Structural models of buildings on varying ground slopes have been created in finite element method based
software ETABS and loads are applied as per GSA 2003 guidelines, for evaluation of progressive collapse nonlinear dynamic method of analysis has been used. To perform non-linear dynamic analysis time history data of Bhuj Earthquake has been applied to the building models. By following the guidelines of general services administration GSA 2003, such as column removal case one at a time has been carried out, namely removal of Corner column both small and long in case of varying ground slopes and Exterior column at ground floor. For all three cases, nonlinear dynamic analysis has done and DCR values are evaluated. Depending upon DCR ratios it is observed that buildings designed as per Indian standard codes are vulnerable to progressive collapse or not. Also comparison of results
obtained due to non linear dynamic analysis like story displacement, base shear and story shear for both along the slope and across the slope of buildings due to effect of column removal conditions as mentioned above has been plotted.