两对称建筑干扰下的超高层建筑风荷载及风效应研究

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摘要两施扰建筑和受扰建筑为等比例方柱模型，通过刚体模型同步测压试验获得单体建筑以及不同干扰工况下受扰建筑的表面风荷载，并在不同折算风速下进行结构风振响应计算。在上游两对称施扰建筑布置下，详细分析受扰建筑的基底气动荷载干扰因子AIF、基底弯矩响应和结构顶部加速度包络干扰因子EIF的分布规律。研究表明上游两侧对称建筑干扰下，顺风向、横风向和扭转向的基底气动力平均值和脉动值主要呈现遮挡效应。上游两侧对称建筑横向距离较大时的AIF大于其横向距离较小时的结果，且其顺风向、横风向和扭转向的峰值基底弯矩响应均表现不同程度的放大效应，相应最大干扰因子EIF分别为1.39、1.04和1.18，然而上游两侧对称建筑的横向间距较小时的顺风向、横风向和扭转向峰值基底弯矩响应仍表现为遮挡效应。受扰建筑顶部顺风向峰值加速度主要起放大效应，最大干扰因子EIF达到1.77。横风向峰值加速度的最大干扰因子EIF达到1.48，但整体小于顺风向的结果。

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	余先锋
	林益新
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关键词 ：高层建筑, 风荷载, 风致响应, 加速度, 干扰效应

Abstract：The two upstream interfering buildings are identical size as the downstream principal building. Pressure distributions of the principal building were obtained by synchronous pressure measurement technique for the isolated and all the interference cases, then wind-induced responses were calculated in difference reduced velocities. Aerodynamic interference factors (AIFs) of base moment and enveloped interference factors (EIFs) of the peak base moment responses and peak acceleration responses were detailed investigated. Results showed that AIFs of the mean and fluctuating base moment and acceleration responses in all the along-wind, across-wind and torsional directions are mainly less than 1, indicating shielding effect. When lateral distance between two symmetrical interfering buildings is big (|y/b|=1.8), the AIFs is greater than those when lateral distance is small (|y/b|=0.9), while the peak base moment responses show amplification effect and the maximum EIFs are 1.39, 1.04 and 1.18 in along-wind, across-wind, and torsional directions respectively. However, shielding effect is dominant for the peak base moment responses in all the three directions when lateral distance is small (|y/b|=0.9). The along-wind peak acceleration responses are mainly amplified, and the corresponding maximum EIF is 1.77. However, the EIFs of peak acceleration response in across-wind direction are smaller than those in along-wind direction, and the corresponding maximum EIF is 1.48.

Key words： high-rise building wind load wind-induced response acceleration interference effect

收稿日期: 2020-09-16 出版日期: 2021-11-15

引用本文:

余先锋，林益新，谢壮宁. 两对称建筑干扰下的超高层建筑风荷载及风效应研究[J]. 振动与冲击, 2021, 40(21): 10-15.
YU Xianfeng, LIN Yixin, XIE Zhuangning. Wind load and wind effect of super high-rise building under interference of two symmetrical buildings. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(21): 10-15.

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http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2021/V40/I21/10

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