Seismic Analysis of Asymmetric in Plan Buildings

Abstract eng:
Buildings with an asymmetric distribution of stiffness and strength in plan undergo coupled lateral and torsional motions during earthquakes. In many buildings the centre of resistance does not coincide with the centre of mass. By reducing the distance between the centre of mass and the centre of stiffness, torsional effects should be minimized. The stiffness characteristics control the dynamic response of the building structure. The choice of the stiffness characteristics of structures is an important step in the conceptual design phase. The good behaviour of the structure can be provided with a well distributed lateral load resisting system. The inelastic seismic behaviour of asymmetric-plan buildings is considered by using the histories of base shear and torque (BST). The procedure to construct the BST surface of the system with an arbitrary number of resisting elements in the direction of asymmetry and of ground motion is proposed. The BST surface describes the inelastic properties of a system, however, the inelastic deformation cannot be computed unless a non-linear static or dynamic analysis is performed. The factors that determine the seismic response are the strength eccentricity, lateral and torsional capacity of the system, planwise distribution of stiffness and excitation.

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