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某拟建838 m高楼多自由度气弹模型风洞试验研究
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Investigation of the Wind-induced Responses of a Tower 838 m High Based on a Multi-degree-of Freedom Aero-elastic Model Wind Tunnel Test
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    摘要:

    为了考察某拟建超高层建筑(总高838 m)在设计风速下的风致响应,对该大厦进行了多自由度气弹模型风洞试验.模型自振特性测试表明,该气弹模型各横截面对两个正交的水平主轴对称,每个轴向1阶和2阶频率误差分别在1%和28%以内,1阶阻尼比约为2%,平动振型与实际结构有限元模型计算结果较为一致.分析不同风速和风向角下风致响应发现,该大厦顶部在100年重现期设计风速下最大动态侧移为0.89 m,且动态位移本身并未使结构顶部位移超标,而10年,50年和100年重现期下风致加速度响应超过规范阈值幅度分别为16%,23%和29%.另外,该大厦横风向涡振使得临界风速附近横风向风致响应明显偏大,如果假定风荷载谱为白噪声,则横风向1阶气动阻尼比对总响应的贡献达37%.若欲保证该建筑在百年一遇风速下加速度在允许范围内,则须使其结构阻尼比在2.9%以上.

    Abstract:

    In order to investigate the wind-induced responses of a tower 838 meters high under the designed wind speed, multi-degree-of freedom aero-elastic model wind tunnel tests were carried out. It was found that the first-order and the second-order frequency inaccuracy of the model, which was measured from the free vibration test, were less than 1% and 28%, respectively, the first-order damping ratio was about 2%, and the translational vibration mode shape was consistent with the actual structure. Wind tunnel test result has shown that the maximum wind-induced dynamic displacement is 0.89m, which is in the standard allowable range. But the wind-induced acceleration of 10 years', 50 years' and 100 years' return period exceeds the specification threshold with the amplitude of 16%, 23%, 29%, respectively. What's more, the lateral response increases remarkably by first order vortex induced vibration,in which the contribution of aerodynamic damping is close to 37%.And in order to ensure acceleration response under one hundred years' wind speed in the allowable range, the structural damping ratio must be larger than 2.9%.

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王磊,梁枢果,邹良浩,娄宇.某拟建838 m高楼多自由度气弹模型风洞试验研究[J].湖南大学学报:自然科学版,2015,42(1):9~16

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  • 在线发布日期: 2015-01-27
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