Effects of tower crown on wind-induced response of super high-rise building

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (11) : 116-123.

MA Wenyong1,2,3, HUANG Zhenghan1, ZHOU Jiahao1, ZHANG Lu1

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Abstract

Tower crown is the part with the most abundant appearance variation in super-high buildings.Because it is located at top of high-rise buildings, changes of its shape have a larger impact on base moment, top displacement and acceleration of high-rise buildings under strong wind.Here, wind tunnel tests of high-rise buildings with square cross section and 20 different tower crowns were conducted to do high frequency aerodynamic balance measuring in wind direction of atmospheric boundary layer.Based on the random vibration theory, displacement and acceleration at top of high-rise buildings with different tower crowns under wind load were analyzed.Wind-induced responses of structures with different tower crowns were compared, and the suggestion for selection of tower crowns was proposed to reduce wind-induced effect.The study showed that the performance of the closed tower crown with square opening is obviously superior to those of tower crowns with other shape openings; the cross-wind response of the smooth sloping tower crown is less than those of other kinds of sloping tower crown; the pyramid tower crown obviously reduces the downwind response at top of buildings; the stepped tower crown has no obvious effect on displacement and acceleration responses at top of buildings in most cases.

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super high-rise building / tower crown / wind tunnel test / wind load / wind-induced response

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MA Wenyong1,2,3, HUANG Zhenghan1, ZHOU Jiahao1, ZHANG Lu1. Effects of tower crown on wind-induced response of super high-rise building[J]. Journal of Vibration and Shock, 2021, 40(11): 116-123

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