Performance Evaluation of the High Rise Steel Building With Outrigger and Belt System

Abstract

Pushover static analysis is a crucial technique in structural engineering used to analysis of structure under earthquake loads. Pushover analysis provides essential inputs into the behavior of structures beyond their elastic limits, offering engineers a thorough understanding of how structures respond to worst conditions. This research will explore the details of pushover static analysis, its importance, and the process involved in performing this analysis. In seismic analysis, assessing how buildings and compositions behave under different forces is of paramount importance. Conventional analysis methods are limited in their ability to capture complex interactions beyond the elastic limit, as they typically focus on linear behavior. As a result, these methods may not accurately predict the response of a structure when it exceeds its elastic limit. Pushover static analysis, also referred as nonlinear static analysis, addresses this limitation by accurately modeling the inelastic performance of structures. The process entails monitoring the progression of yielding, the formation of plastic hinges, and the eventual failure of different structural elements. This data is then utilized to plot a capacity curve, depicting the total force in relation to the displacements. During this analysis, displacement is progressively increasing from zero to a defined ultimate displacement or until the building can no longer sustain additional loads. This method is extensively used to estimate the axial and flexural capacity of existing structures and to determine the seismic requirement of modelled building during selected earthquake scenarios. It is also useful for evaluating the sustainability of new structural designs during linear behavior. The practicality and computational simplicity of pushover analysis have proven to its applications in several earthquake design guidelines (such as FEMA 356 and ATC 40) and design codes (including PCM 3274 & Eurocode 8) over the past few years. The research involved a comprehensive comparison of two pushover methods, namely displacement control and full load method, for steel frame structures with identical G + 17 configuration. The study focused on analyzing the maximum story drifts, story displacements, and hinge responses to seismic loads. Steel frameworks have been found to exhibit better seismic performance than Reinforced Cement Concrete (RCC) structures, especially in areas prone to earthquakes. This makes them a more favorable choice for construction in such regions. The analysis also reveals that, although DCM provides detailed insights, it requires a lot of resources, which makes FLM a more practical choice for routine market applications.