Study on RMS value of base torsional moment coefficient of tall buildings with square and rectangular sections

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Journal of Vibration and Shock ›› 2011, Vol. 30 ›› Issue (10) : 1-5.

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Study on RMS value of base torsional moment coefficient of tall buildings with square and rectangular sections

GU Ming1 ; ZHANG ZhengWei 1,2; QUAN Yong1; XIONG Yong1

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Abstract

71 rigid models of typical square and rectangular tall buildings are tested with high frequency force balance (HFFB) technique in four different simulated wind fields; and their base torsional moment coefficients are obtained accordingly. Effects of parameters such as wind field, models’ aspect ratio and side ratio on the RMS values of the torsional moment coefficient at the base of the structure are then studied. The test results indicate that the effect on the torsional fluctuating forces is changed with the side ratio, and the side ratio has a strong effect on the across-wind fluctuating forces. The influence of models’ aspect ratio is negligible because the aspect ratio only induces the microvariation of the distribution of the aerodynamic force in the top of the model, and the influence of wind fields is varied with different side ratios. New formulas for the standard deviation of the base moment coefficient of torsional wind loads on the tall buildings are formulated by using the nonlinear least - squares method, and the errors of the empirical formula are analyzed, which provides technical support for the revisions and supplements of load codes. And by comparison with the results from the present wind tunnel test results and data in literatures, the precision and applicability of the present formulas are finally verified.

Key words

rectangular tall buildings / wind tunnel test / aerodynamic base torsional moment coefficient / empirical formula

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GU Ming;ZHANG ZhengWei;QUAN Yong;XIONG Yong. Study on RMS value of base torsional moment coefficient of tall buildings with square and rectangular sections[J]. Journal of Vibration and Shock, 2011, 30(10): 1-5