Seismic Fragility Curves of R.C.Framed Buildings Designed as per is Low, Medium and High Code

Abstract

In India, the RC buildings codes of gravity and seismic loads have been revised over five decades. The adaptation of gravity and seismic loads combination were rarely taken into design consideration in low and mid-rise building. In the last five decades, low and mid-rise buildings have been constructed high in number in urban cities due to increasing more employment opportunity. The around 56% of the landmass is prone to moderate to severe the earthquake. Also, it evident, in Bhuj 2001 earthquake, many mid and low rise was suffered severely, and more life loss occurred. The seismic zone map has been updated from 1968-2016 and seismic demand increased manifold. The RC buildings have been designed different design philosophy over the period of time, and the urgent need for the assess the vulnerability buildings which have been designed different design codes. In this paper, an attempt made to derive the fragility curves of three and five story RC buildings with aspect ratio and designed as per IS 456-1964 (Low code), IS 456-1978 (Medium code) and IS-13920 (High code). The modelling and pushover analysis are carried out by using a numerical method. User-defined hinge properties for the column as P-M-M and beam as M3 curves have been derived and assigned column and beam elements. The displacement control is applied in pushover analysis. The fragility curves have been derived as per guidelines are given by HAZUS technical manual. Results are compared with design philosophies, aspect ratio and the number of storeys for a given intensity of the acceleration.