Seismic Behaviour of Asymmentric Structures “H, L, U” Shape (G+5)

Abstract

Due to their functionality, asymmetric structures are increasingly utilized in contemporary architectural designs. The horizontal irregularity that makes an asymmetrical building (e.g., L-, T-, U-, and F) or discontinuities in horizontal resisting elements (diapharagms) such as large cutouts fall under the irregular configuration of buildings.

            The horizontal irregularity that gives an asymmetric building its asymmetrical plan shapes (like L, T, U, and F) or discontinuities in horizontal resisting elements (diapharagms) like cutouts, large openings, re-entrant corners, and other abrupt changes that cause torsion and stress concentration are all examples of irregular configurations. The behavior of an asymmetric building under seismic load is depicted in this paper. The analysis is carried out using the same static and dynamic analysis techniques.

                        During earthquakes, buildings with a plan that has an asymmetric distribution of strength and stiffness experience coupled lateral and torsional motions. The center of mass and the center of resistance do not always align in many buildings. To reduce torsional effects, reduce the distance between the center of stiffness and the center of mass. The building structure's dynamic response is controlled by its stiffness characteristics. In the conceptual design phase, a crucial step is selecting structures' stiffness characteristics. A lateral load resisting system that is evenly distributed can help the structure behave well. The histories of base shear and torque (BST) are used to consider the inelastic seismic behavior of buildings with asymmetrical plans. It is suggested how to construct the system's BST surface with any number of resisting elements in the direction of asymmetry and ground motion. A system's inelastic properties are described by the BST surface; however, a non-linear static or dynamic analysis is required to calculate the inelastic deformation. The system's strength eccentricity, lateral and torsional capacity, planwise stiffness distribution, and excitation are the factors that influence the seismic response