Optimal Placement of Rigid Outriggers for Super Tall Buildings Located in High Seismic Intensity Area Based on Storey Drift Sensitivity Vectors

Abstract

Modern buildings are developing toward high-rise and super-high-rise buildings. Super high-rise buildings are subjected to significant lateral loads and high-flexibility in high-intensity seismic areas. As a component that can effectively improve the lateral stiffness of the structure, the rigid outrigger is widely used in super high-rise structures at home and abroad. However, there are many mechanic floors in high-rise buildings, and there are hundreds of different combinations of outrigger numbers and positions. In order to reduce the structural natural vibration period and the amount of steel used, it is particularly important to determine the optimal position of the rigid outriggers. Previous studies proposed sensitivity vector method for high-rise buildings with outriggers under wind load control. This paper analyzes the super-high-rise structure with the outrigger in high-intensity seismic area, which shows that the algorithm is also applicable to the ultra-high rise buildings with outriggers under seismic load.KeywordsSuper tall buildingsHigh-intensity seismic areasStory drift ratioRigid outriggersSensitivity vector algorithm