PUSHOVER ANALYSIS WITH AND WITHOUT INFILL STIFFNESS CONSIDERATION IN ZONE III AND ZONE IV

Abstract

The past earthquakes in which many reinforced concrete structures were severely damaged have indicated the need for evaluating the seismic adequacy of buildings. To make such an assessment, simplified linearelastic methods are not adequate. The aim of this study is to perform non linear static pushover analysis and assess the non linear behavior of building frame on altering the dimensions of the RCC frame structure (i.e. number of bay as well as storey height) for two different earthquake loading(i.e. for Siesmic Zone III and Zone IV) using software SAP2000. In a building, the main purpose of masonry infilled walls is to fill the gap in between the building frame’s horizontal and vertical resisting elements, where it is pre-assumed that Hence, while designing masonry infilled walls do not considered as a structural element, i.e. we design the structure as a bare frame only. But these masonry infilled walls, to a large extent affects structural strength and stiffness properties, and on the other hand, they are very brittle in nature. Some international publications like FEMA-273/306/356[5] contains methods for masonary infill walls stiffness calcultations and modelling them as equivalent diagonal pin-jointed strut which is also known as macro modelling of infill walls. And subsequently analyse the inplane effect of masonary infill wall designed as a equivalent diagonal strut on the Reinforced Concrete structure as compared to bare frame structure.