Study Of Wind Induced Responses And Wind-resistance Measures On 200m Residential Super High-rise Buildings

With the development of social economy and engineering technology,super high-rise buildings are universal in cities,and the section types of residential buildings with larger aspect ratio and become more complex according to the requirements of building functions.High-rise buildings are characterized by light weight,large flexibility,small damping,long natural period,led to structure sensitive to wind load.Wind induced response and load are the main control factors in structural design.In practical engineering projects,the cross wind induced response calculated by standard formula is too high and exceeds the limit of relevant code usually.Concave and cut corners in rectangular plane are normal aerodynamic measures to reduce the wind induced response of structures,but these methods are drawn from the single rectangular plane architecture tests.In practical engineering,the section types and surroundings tend to be more complex,and the vibration reduction effects of these measures are not clear,the applicability should be evaluated through experiments.Through wind tunnel tests,this paper studies the wind induced response of 200 m super high-rise buildings with different aspect ratios,the influence of different aerodynamic measures on wind induced response of buildings with different section types,and the applicability of aerodynamic measures in complex surroundings.The main contents are summarized as follow:(1)The wind induced response(WIR)of rectangular plane super high-rise buildings with different aspect ratios was studied,and analyzed the influence of aspect ratio,damping ratio,turbulivity and other factors on WIR,then compared the test results with the results of Load code for the design of building structures GB50009-2012.The results show that: Both the across-wind and the along-wind WIR of super high-rise buildings first increase and then decrease with the increase of aspect ratio,and reach the maximum value with the aspect ratio1.The test WIR of each aspect ratio are generally less than the results of GB50009-2012,and the code result of a building with aspect ratio of 1.5 in terrain C is 1.97 times of the test result.The WIR of terrain B is greater than that of terrain C,and the difference of WIR between two terrains decreases with the increase of aspect ratio.(2)The vibration reduction effects of different concave corner aerodynamic measures(including small concave corner,large concave corner,combined concave corner,etc.)with various aspect ratios are studied.The main conclusions are as follow: Different concave corner measures will show different vibration reduction effects with different concave corner ratio,orientation and aspect ratio of plane.In the case of the narrow edge facing the wind,the small concave corner has a better vibration reduction effects on the plane with aspect ratio of 3,and the best damping effect is 24.14% with concave corner ratio of 10%.The same aerodynamic measures have no obvious vibration reduction effects on the plane with aspect ratio of 4.In the case of the wide side is facing the wind,the large concave corner has a better vibration reduction effects on the(multi-link)T-shaped plane.In terrain C,the vibration reduction effects of concave corner are weakened.(3)Taking a super high-rise building as an example,the vibration reduction effects of different aerodynamic measures and its applicability in complex surroundings are studied.The study shows that: The WIR of the sub-tower can be reduced by using aerodynamic measures in the windward side.In the case of only considering sub-tower and considering all the surrounding buildings,the WIR of the sub-tower can be reduced by 9% and 12% respectively compared with the non-optimized plane.The main tower located downstream of the wind-sensitive corner can well reduce the WIR of the sub-tower by inhibiting vortex shedding.