DYNAMIC RESPONSE OF HIGH RISE BUILDING

Abstract

Throughout history, structures across the globe have endured the destructive forces of earthquakes, resulting in substantial losses to property, lives, and assets. This report focuses on investigating the dynamic response of tall buildings when subjected to dynamic loads, particularly those induced by earthquakes. In order to mitigate the adverse effects on structures, earthquake-resistant design practices are implemented, encompassing four key components: seismic structural configuration, lateral stiffness, lateral strength, and ductility. A comprehensive understanding of a structure's response to seismic loads is imperative for the implementation of effective earthquake-resistant design principles. This report also examines past instances of high-rise building failures during earthquakes, identifies the underlying causes, and incorporates relevant codal provisions necessary for the design of tall buildings. In this research study, initially I examined the susceptibility of tall buildings to seismic and wind loads. Subsequently, I reviewed the existing research conducted by various scholars to gain insights into the performance of tall structures under wind and seismic loading conditions. Furthermore, I followed the design provisions outlined in IS 456:2000, IS 13920:2016, IS 1893 (Part 1): 2016, and IS 16700:2017. Following this, I proceeded to model and design of three 20 storey buildings using ETABS 20.3 software. The first model represented a bare frame, the second model included shear walls at the corners, and the third model incorporated shear walls at all four edges. Then conducted a dynamic response analysis of these structures using the non-linear time history method. The seismic evaluation was performed for two performance levels named the design-based earthquake (DBE) and the maximum considered earthquake (MCE). Parameters such as inter-storey drift, maximum displacement, and base shear were utilized as valuable sources of information for the non-linear time-history analysis at both performance levels.