SEISMIC ANALYSIS OF CONFINED MASONRY STRUCTURE USING ETABS

Abstract

Buildings are our basic needs. It protect us from rain, sun, theif e.t.c. We spend most of our time in a building whether it is residential, commercial, institutional, industrial. In Damage or collapsing of such types of vital structures leads to a lot of risk for human lives & results in monetary loss. So, the building should be earthquake resistant. One of the reasons of failure of structure is earthquake. It is found that the reasons behind these collapses are mostly due to the poor construction practices and substandard practices involved in the construction of building. As a structural engineer our duty should be to improve the seismic performance of structure with keeping economy in mind. Confined masonry structure is a construction technology/typology in which first wall are constructed, followed by column and beam. It is similar to RCC and masonry structure in appearance but different in resisting the earthquake load. Due to the lack of relevant design and construction standards, confined masonry construction is currently not practiced in India. However, several initiatives have been launched to promote confined masonry construction over the last ten years. This paper presents the seismic analysis of confined masonry structure using ETABS. Response spectrum method is used for analysis to study the in plane and out of plane behaviour under earthquake loading in seismic zone v. Effect of wall density and shape of column on the seismic performance of confined masonry structure has been also studied. To study the effect of wall density, analysis is done for 110 mm wall, 150mm wall and 230mm wall. To study the effect of shape of column, rectangular and square column is used. Performance of confined masonry and RC frame structure has been also studied. Results are compared on the basis of maximum storey displacement, max storey drift, base shear, overturning moment, modal mass participation ratio. With the study it has been observed that by increasing the wall density seismic performance of confined masonry structure has been increased. In CMS, it has been observed that max storey displacement and drift was less but overturning moment & base shear was more as compare to RC frame structure.