SEISMIC RISK ASSESSMENT OF VERTICALLY IRREGULAR BUILDINGS

Abstract

Many structures are designed with vertical irregularity for architectural views. The construction of the vertical irregular buildings is being increased due to the functional as well as aesthetic requirement. The current study focuses on determining the various parameters required to describe the monotonic and hysteretic response of equivalent strut-modelled infill walls. Different strut formulations and hysteretic models have been analyzed in depth and utilized to duplicate many experimental tests available in the literature in order to pick a simple and reliable analytical model that is suitable for capturing the infill wall response. The OpenSees computer program is used to do the numerical analyses. The capacity of three uniaxial material models available in OpenSees to reproduce the experimental hysteretic response is tested. Finally, based on comparisons between different models and numerical and experimental data, recommendations are offered for modelling the in-plane non-linear response of infills effectively. The annual likelihood of collapse soft story structures designed according to current Indian design standards is within acceptable limits, according to risk-based performance evaluation. The seismic risk framework-estimated response reduction factor is smaller than the code-specified value. As a result, soft storey buildings designed according to current IS standards lack the necessary inelastic capacities.