长宽比2∶1矩形截面高层建筑全风向气动阻尼试验研究
发布时间：2019-08-03 06:45
【摘要】：由于高层建筑阻尼小、频率低,易在风荷载作用下发生明显的气动弹性效应,出现不可忽略的气动负阻尼比。为此,考虑高层建筑的一阶线性弯曲模态,制作了长宽比2∶1的矩形截面高层建筑的单自由度气动弹性模型,模型比例1/600。进行了全风向下气弹模型风洞试验,每个风向测量了10个试验风速下的建筑顶部加速度响应,并采用随机减量方法,对矩形截面高层建筑气动阻尼比进行识别。研究结果表明:对于长宽比2∶1的矩形截面高层建筑,强轴方向的风致加速度响应远大于弱轴方向;两个主轴方向的顺风向气动阻尼比均为正值,但强轴方向的横风向气动阻尼比为负值,无量纲临界风速约为5.5;仅采用横风向气动阻尼比结果,可以很好地反映全风向的气动阻尼特性。
[Abstract]:Because of the small damping and low frequency of high-rise buildings, it is easy to have obvious Aeroelastic effect under wind load, and there is a negative pneumatic damping ratio that can not be ignored. For this reason, considering the first order linear bending mode of high-rise building, the single-degree-of-freedom Aeroelastic model of rectangular section high-rise building with length-to-width ratio of 2:1 is made, and the ratio of the model is 1 鈮，
本文编号：2522401
[Abstract]:Because of the small damping and low frequency of high-rise buildings, it is easy to have obvious Aeroelastic effect under wind load, and there is a negative pneumatic damping ratio that can not be ignored. For this reason, considering the first order linear bending mode of high-rise building, the single-degree-of-freedom Aeroelastic model of rectangular section high-rise building with length-to-width ratio of 2:1 is made, and the ratio of the model is 1 鈮，
本文编号：2522401
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