COMPARISON OF SEISMIC FRAGILITY CURVES FOR RC FRAMED BUILDINGS IN ZONE III AND V; FOR HARD, MEDIUM AND SOFT SOIL AS PER IS1893 PART-1: 2002 AND HAZUS MH 2.0

Dhara Shah

Abstract: India, one of the most disastrous countries in the world has experienced several devastating earthquakes in the past resulting in casualties including property damage, deaths and injuries. The frequent occurrence of damaging earthquakes in India demands vulnerability assessment of structures especially residential buildings for disaster mitigation and emergency preparedness. In the present study seismic fragility curves are derived for low-rise, mid-rise and high-rise concrete buildings for seismic risk zone III and V considering hard, medium and soft soil as per IS1893 part-1(2002). Buildings are modeled using nonlinear platform. Pushover analysis is performed on the buildings to find their capacity curves. Damage states are established as per the hinge formation as well as HAZUS MH 2.0. Default spectra provided by IS1893 part-1 are used to select seismic events representing demand. Using Capacity Spectrum Method, displacements are obtained to create response matrix. Based on the damage states and the response matrix, fragility curves are constructed using Microsoft Excel. It is observed that buildings situated in soft soils are more vulnerable than those situated in medium and hard soil. Also, HAZUS underestimates the damage probability of the buildings and hence cannot be referred for Indian context. Site specific spectra are recommended for precision.

Keywords: seismic fragility curves, RC framed building, IS1893 part-1:2002, HAZUS MH 2.0

DOI: https://doi.org/10.15623/ijret.2018.0706004