Optimum Location of Outrigger Structural System in Tall Vertical Irregular RC Building Subjected to Lateral Loads

Abstract

The development of tall buildings has been rapidly increasing worldwide, introducing new challenges that need to be met through engineering judgment. One effective structural system used to control excessive drift due to lateral loads is the outrigger system. This system minimizes the risk of structural and non-structural damage during small or medium lateral loads caused by wind or earthquakes. Particularly for high-rise buildings in seismically active zones, the outrigger system is a suitable structural choice. This thesis employs ETABS 21.0.0 software to analyze the performance of vertical irregularities in outrigger structures through Response Spectrum Analysis. The objective of this study is to investigate the behavior of outriggers under lateral loads, optimize outrigger location, and evaluate the efficiency of each outrigger when outriggers are used at different story heights. 30-storey three-dimensional models, with and without outrigger and belt truss systems are used subjected to wind and earthquake loads. These models are analyzed and compared to determine the story drift, story displacement, and base shear reduction associated with different outrigger and belt truss system locations. The study includes a comprehensive analysis of story displacement, story drift, and base shear of the structure.