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为获得不同干扰工况下受扰建筑表面时变风荷载,进行了刚性模型的同步测压试验。对不同折算风速下的扭转响应进行了计算,分析受扰建筑在不同相对位置、不同截面宽度、不同高度的施扰建筑干扰下的基底峰值扭矩响应干扰因子包络值分布规律,并进一步研究了尾流涡激共振机理及其发生条件。结果表明,未发生涡激共振时,峰值扭矩干扰因子包络值最大达到1.9;随着施扰建筑与受扰建筑截面宽度比增大,并列布置时的峡管放大效应越来越显著,峰值扭矩响应最大增加42%。施扰建筑与受扰建筑截面的宽度比为0.4时,施扰建筑旋涡脱落的尾流导致扭转向涡激共振发生,当折算风速达到4.37时,峰值扭转干扰因子包络值达到最大值2.98。随着施扰建筑与受扰建筑的高度比的增加,峰值扭矩干扰因子包络值呈增大趋势。在群体高层建筑抗风设计中,需重点关注施扰建筑高度大于等于受扰建筑高度时的放大干扰效应;对于施扰建筑与受扰建筑截面宽度比较小(0.3~0.5)情况,应避免受扰建筑的折算风速落在3.33~5.56范围内而发生扭转向涡激共振效应。
In order to obtain the time-varying wind loads on the disturbed building surface under different interference conditions, the synchronous load-bearing test of rigid model was carried out. The torsional response at different converted wind speeds was calculated and the law of distribution of the peak torque response disturbing factor envelope values of the disturbed buildings at different relative positions, widths and heights of different structures was analyzed. Wake Vortex Mechanism and Its Occurrence Conditions. The results show that the maximum value of peak torque disturbance factor envelope reaches 1.9 when no vortex-induced resonance occurs. With the increase of the width ratio of the cross-section of the disturbed building and the disturbed building, the enlargement effect of the pipe-laying is more and more obvious. The peak value Torque response up to 42% increase. The ratio of the width of the perturbed building to the cross-sectional area of the disturbed building is 0.4, and the turbulent vortex-induced excitations of the wake of the building vortex shedding occur. When the converted wind speed reaches 4.37, the peak torsional disturbance factor envelope reaches the maximum value of 2.98. As the height ratio of the disturbed building to the disturbed building increases, the envelope value of the peak torque disturbance factor shows an increasing trend. In the wind-resistance design of high-rise buildings in groups, attention should be paid to the effect of amplification disturbance when the height of the false building is greater than or equal to the height of the disturbed building. For the small width (0.3-0.5) of the cross-section of the disturbance building and the disturbed building, Disturbing the construction of the converted wind falling within the range of 3.33 ~ 5.56 and the occurrence of torsional vortex-induced vibration effect.