Mohaddese Sadeghpour
Afshin Meshkat-Dini
Abstract
Recent societal needs have led to the expanding growth of tall buildings with added emphasis on safety, human comfort, and serviceability under wind and earthduake loading as well as environmental and economic impact. In modern tall buildings, lateral loads induced by wind or earthquake are often resisted by a system of coupled shear walls. But when the building increases in height, the stiffness of the structure becomes more important. One of the most efficient approaches to provide both strength and stiffness in a structural frame is to implement hybrid system of peripheral braced frame along with belt truss. This paper aims to investigate the seismic behaviour of steel tall buildings having a compound braced-tube resistant skeleton with belted trusses in higher levels.To this end, two 30-story study models have been designed in 3D. The chosen ensemble of three-component ground motions includes highly powerful near-field records as well as one far-field tremor. Based on the analysis results results in a large decrease in lateral displacement and dynamic drift of the structure and will therefore cause an increase in using the axial capacity of peripheral columns of the structre plan. Therefore, implementing belt truss in addition to lateral resisting system of the structure, is proposed as an efficient scheme in designing high rise buildings.
Keywords
Tall Building; Hybrid Resistant Structures; Belt truss; Seismic Behavior ;outrigger