PROGRESSIVE COLLAPSE ASSESSMENT OF MULTI-STOREYED BUILDING

Abstract

The issue of progressive collapse has been trending since it's connected with uncertainties that can make it difficult to accurately assess a structure's safety. The purpose of the current is to perform bibliometric analysis along with literature review of progressive collapse and execute progressive collapse analysis of a seven-storey RC building in SAP2000 and study the influence of different parameters of the building. In this study nonlinear dynamic analysis coupled with response surface methodology (RSM) is employed to investigate progressive collapse of a seven-storey RC building. For nonlinear dynamic approach of progressive collapse, structural analysis software SAP2000 is used. In response surface, Box–Behnken design is employed to analyse the progressive collapse of the structure with three positions of column elimination i.e. corner, middle and penultimate position. The current study considered three independent input variables namely grade of concrete, length and depth of beam with three levels and deflection of beam is taken as a response. Based on the ANOVA results, all three input parameters have substantial impact on the response in each of the three positions of column elimination. In each case RSM fits quadratic model for deflection of beam with confidence interval of 95%. The response calculated using the generated model is found to be quite close to the actual readings. The main effects plots are not horizontal line which describes the significance of individual factors with different levels on the response. Results shows that with the increase in the values of grade of concrete and depth of beam, the vertical v deflection of the upper node of column removal point decreases whereas increase in beam length increases the deflection. The interaction effect of different factors, grade of concrete versus beams length and beam depth versus beam length, is significant in corner column elimination. But in middle column elimination case, the interaction effect of beam length versus depth is close to significant while no interaction effects are found significant in penultimate column removal case. The values of grade of concrete and beam depth should be in the higher range and beam length should be in the lower range to get the optimal response. It also covers limitations and future research of the current study.