Experimental Study On Aero-elastic Effect Of Typical Super Tall Building

The development of society and global science and technology, along with the rapid urbanization process has promoted the construction of super high-rise building over 500 meters and the trend will get further expansion in the future. This kind of building is mostly light high-rise flexible structure and is especially sensitive to wind load environment thus wind load has become an important controlling load. At the same time,since the cross-wind effect is the main regulatory factor for this kind of structure,special attention should be given to the coupling effect between wind and structure under strong wind condition.This paper studies the super high-rise structure over 500 meters. It designed and manufactured a square section aero-elastic model and practiced a relatively detailed test research. With the measured time-history response in acceleration of the structure top, this paper adopted random decrement technology (RDT) and wavelet mode analysis then identified the structural dynamic response parameter, which effectively get rid of the interference from model coupling effect to identification of aerodynamic damping. Through the research, this paper analyzed and summarized the rules that the windward side and turbulence respectively influence structural along wind and cross wind aerodynamic damping.This paper designed and manufactured an integrated model of simultaneous multi-pressure measurement and aero-elasticity and conducted simultaneous pressure and vibration tests accordingly. It contrastively analyzed the aerodynamic loading characteristics of aero-elastic model and aerodynamic rigid model in typhoon landforms and discovered some typical phenomenon of fluid-solid coupling effect's influence on cross wind aerodynamic load. It further verified the observed results through aerodynamic spectrum obtained by inversion of structural wind-induced vibration response. This paper analyzed and summarized the rules of super high-rise structure's locked-up vortex shedding frequency and rules that the structural vibration response's reaction effect on aerodynamic load varies with the speed of wind.