ANALYSIS OF IRREGULAR STRUCTURE

Abstract

Structures possess irregular characteristics—either of form, mass, stiffness, or strength—mainly to fulfil functional needs or aesthetics. While being common practice in modern construction, these can have a significant impact on the behaviour of a building under earthquake loads. Experience has shown that structures with irregular plans or elevations tend to get damaged or collapse. For this reason, structural irregularities are a significant concern in earthquake regions. Design of a building is making deliberate choices regarding where and how to use such irregularities since they have a direct impact on the building's stability. IS 1893 (Part 1): 2016 states that irregularities must be avoided wherever possible through proper planning of architectural and structural arrangement. In fact, in actuality, there is no building that is entirely regular. Irregularities tend to be unavoidable in the context of actual design limitations and demands of urban development. The aim of this research is to examine how various irregular building forms resist seismic loads through the use of STAAD Pro software. The research begins by modelling a G+3 storey reinforced concrete L-shaped frame and then extending other models of other various different irregular forms. Through the use of the Response Spectrum Analysis approach, the models are loaded with earthquake loading to see how they perform against each other. The aim is to identify which of the forms is most resistant to seismic loads and which is most susceptible.