高层建筑间风致扭转干扰效应的试验研究

发布时间：2018-02-10 14:42

本文关键词： 高层建筑风致扭矩响应干扰效应折算风速涡激共振　出处：《建筑结构学报》2015年11期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:In order to obtain time-varying wind loads on the surface of disturbed buildings under different disturbance conditions, simultaneous pressure measurement tests of rigid models are carried out. The torsional responses of disturbed buildings under different converted wind speeds are calculated, and the disturbed buildings are analyzed at different relative positions and different cross-section widths. The envelope value distribution of the disturbance factor of peak torque response of the base under the disturbance of different height is studied, and the mechanism of wake vortex-induced resonance and its occurrence conditions are also studied. The results show that the vortex-induced resonance does not occur when there is no vortex-induced resonance. The maximum envelope value of peak torque disturbance factor is 1.9. With the increase of cross-section width ratio between disturbed building and disturbed building, the amplification effect of isthmus pipe becomes more and more obvious when parallel arrangement is made. The maximum increase of peak torque response is 42.When the width ratio of disturbed building to disturbed building section is 0.4, the wake of disturbed building vortex shedding results in torsional vortex-induced resonance, when the converted wind speed reaches 4.37, The envelope value of peak torsional disturbance factor reaches the maximum value of 2.98. With the increase of height ratio between disturbed building and disturbed building, the envelope value of peak torque disturbance factor increases. Attention should be paid to the amplification of interference effect when the height of disturbed building is greater than or equal to the height of disturbed building; for disturbed building and disturbed building, the cross section width is smaller than 0.30.5. The torsional vortex-induced resonance effect should be avoided when the reduced wind speed of the disturbed building falls within the range of 3.33 ~ 5.56.
【作者单位】：华南理工大学亚热带建筑科学国家重点实验室;
【基金】：国家自然科学基金项目(51408227) 中央高校基本科研业务费专项(2015ZM001)
【分类号】：TU973.213

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