Abstract

Multi-storey buildings with irregular geometry and structural systems have become prevalent due to various\npossibilities offered by modern materials and construction methods. However, damage from past earthquakes shows that\nstrong torsional effects are responsible for the collapse of asymmetric buildings. Torsional irregularity depends on a number\nof factors like plan geometry, dimensions or position of structural elements and number of storeys. Torsional irregularity in\nplan, induced due to change in position of the lateral load resisting elements (shear walls) in reinforced concrete shear wall\nbuildings of varying aspect ratios is studied in this paper. Initially symmetric buildings with L-shaped shear walls on\ndiagonally opposite corners, and on all four corners are considered. A stipulated amount of eccentricity is introduced in these\nbuilding configurations by changing the positions of the structural walls along the plan. Time history analysis is carried out to\nevaluate the torsional behaviour of the asymmetric buildings in terms of variation in base shear, fundamental time period,\nroof deflection and floor rotation. The results show that change in the dynamic eccentricity of the shear wall buildings causes\nvariations in floor rotation and torsional response of both the building configurations.