SESMIC ANALYSIS OF VERTICALLY REGULAR AND IRREGULAR BUILDING

Abstract

Earthquake damage results from several key factors, including irregularities in building design, soft stories, inadequate lateral strength, and structural interactions between the building and the ground. Within contemporary urban infrastructure, tall irregular structures play a significant role, representing a prominent feature that significantly impacts a building's response to seismic activity. Irregular structures are characterized by variations in geometry, mass distribution, and stiffness, making them susceptible to earthquake-induced damage. This study focuses on the analytical examination of vertical irregularities, encompassing stiffness irregularities, mass irregularities, and vertical geometry irregularities. The study comprises a total of 10 models, including an 11-story moment- resisting frame (MRF) building, along with additional models derived from the initial one to investigate stiffness, mass, and vertical geometry irregularities. Response spectrum analysis considering the design response spectrum provided by NBC 105:2020 is performed in each model and various responses of building are compared. From the study, it is concluded that there is significant variation in the responses of tall building with introduction of different vertical irregularities. Among the different kinds, the vertical geometry irregularity has comparatively more effect in responses in comparison to mass and stiffness irregularity in a particular storey.