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工程力学  2013 

修角对方形超高层建筑横风向气动阻尼的影响

DOI: 10.6052/j.issn.1000-4750.2012.07.0547

Keywords: 风工程,高层建筑,随机减量技术,横风向气动阻尼,气动弹性模型风洞试验,气动修正横截面

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Abstract:

为了研究横截面削角、凹角及沿高收缩处理三种气动修正措施对作用在建筑上的横风向气动阻尼比的影响,对10个超高层建筑气动弹性模型进行了风洞试验。利用随机减量法识别了横风向气动阻尼比,通过与前人相关研究成果的比较,验证了识别结果的正确性。研究结果表明:角沿处理及截面沿高收缩对抑制超高层建筑的气动弹性效应并非总是有效,较小的削角率(5%~20%)、凹角率(5%和10%)及沿高收缩率(1%)可以有效的减小各折减风速下气动阻尼比绝对值的大小,而当这些气动修正措施相对尺寸较大(凹角率20%、3%及5%的沿高收缩率)时,气动阻尼比的改变将增大结构风致振动响应。基于这些研究,拟合了适用于低折减风速下相应工况的横风向气动阻尼比的经验参数,供工程设计人员参考。

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