SEISMIC BEHAVIOUR OF FRAME SHEAR WALL BUILDING

Abstract

Earthquake causes lateral forces in buildings, due to their inertia. A number of structural systems for buildings have been developed, over the years, to resist the lateral load. Shear wall and frame-shear wall systems are quite common for mid-rise buildings. Performance of shear wall buildings during past earthquakes has been observed to be quite satisfactory. In this dissertation an analytical study has been made to estimate the performance of frame shear wall buildings designed as per current IS codes. A number of options are available for analytical modelling of shear walls. In linear range the shear walls can be modelled either as wide columns or using plane stress elements. Perform 2D/ 3D software provides two elements for non- linear modelling of shear walls. In the present study, five 10 storeyed buildings with different shear wall areas, including a frame building without shear wall have been considered. These buildings have been analysed and designed as per IS codes, using STAAD software. Non-linear behaviour and performance of these building under expected earthquake have been studied using Non-linear Static Push Over Analysis in Perform 3D software. It has been observed that behaviour of the bare frame building without shear wall is not satisfactory, while the behaviour improves significantly with shear walls. Effect of varying the area of shear wall, on the behaviour of buildings has been studied and optimum shear wall area in terms of the floor area has been estimated. The effect of non- linearity on frame shear wall interaction has also been studied.