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两矩形高层建筑的风致干扰效应
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Wind-induced Interference Effects between Two Rectangular High-rise Buildings
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    摘要:

    基于高频测力天平风洞试验,分析了实际工程中矩形高层建筑风致干扰产生的原因. 在此基础上,研究了两矩形高层建筑不同空间位置下的气动干扰效应. 结果显示:矩形高层建筑风荷载的干扰放大效应主要是其侧后方正交布置的另一矩形高层建筑导致,且这一矩形建筑处于受扰建筑下游时产生的干扰效应明显高于处于上游的情形. 沿受扰建筑的侧方和后方增大两矩形高层的间距比,风荷载干扰效应整体呈递减的趋势,加速度干扰效应呈先增大后减小的趋势. 施扰建筑在受扰建筑侧方移动时的干扰范围和强度均要高于在受扰建筑后方移动时的情形. 受扰建筑顺风向体型系数的最大干扰因子可达1.41. 干扰效应也会显著增大受扰建筑横风向的体型系数,以单体状态顺风向体型系数归一化的干扰因子为1.08. 进一步考虑动力放大作用后,受扰建筑顺风向和横风向基底弯矩的干扰因子可分别达到1.49和2.28,加速度的干扰因子最大可达1.23.

    Abstract:

    Based on high-frequency force balance wind tunnel tests,the reason for the interference effects on rectangular high-rise buildings in actual engineering was investigated. On this basis,the aerodynamic interference effects of two rectangular high-rise buildings in different spatial positions were studied. The results show that the interference amplification effect of the wind loads on principal rectangular buildings is mainly caused by another rectangular high-rise building located at the side and back of the principal building with orthogonal arrangement,and the interference effect of interfering rectangular building in the downstream region of principal building is significantly higher than that in the upstream region. By increasing the spacing ratio of the two rectangular high-rises along the side and rear of the principal building,the wind load interference effect tends to decrease overall,and the acceleration interference effect first increases and then decreases. Furthermore,the interference range and intensity of the interfering building moving on the side of the principal building are higher than that moving behind the disturbed building. The maximum interference factor (IF) of the downwind shape coefficient of principal building is 1.41. The interference effect also significantly increases the lateral average wind load of principal building. The lateral interference factor (IF) normalized by the along-wind shape coefficient of single building can be up to 1.08. After further considering the dynamic amplification effect,the IFs of the base moment of principal building at the along-wind and across-wind direction are 1.49 and 2.28,respectively,and the maximum acceleration IF of the building is 1.23.

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刘慕广?覮,何勇,谢壮宁.两矩形高层建筑的风致干扰效应[J].湖南大学学报:自然科学版,2021,48(3):128~135

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  • 在线发布日期: 2021-03-23
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