The effect of amplitude-dependent damping on wind-induced vibrations of a super tall building
The effect of amplitude-dependent damping on wind-induced vibrations of a super tall building
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DOI：
10.1016/s0167-6105(03)00080-1
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发表时间：
2003-09-01
影响因子：
4.8
通讯作者：
Jeary, AP
中科院分区：
文献类型：
--
作者：
Li, QS;Yang, K;Jeary, AP
对一座70层高楼的风效应进行了全面测量。这座高达367米的高楼是香港第二高的建筑。通过对加速度响应的现场测量，采用随机减量技术，得到了阻尼的幅值特性。基于实测的非线性阻尼和风振特性，详细研究了阻尼幅值相关对超高层建筑风致响应的影响。本文提出了一种高效、省时的数值模拟方法，根据实测风速记录生成作用在高层建筑上的湍流风荷载时间序列。预测的动态响应的建筑物使用的实际振幅依赖的阻尼特性进行比较，通过使用恒定的阻尼参数计算的结构设计师假设或估计从现场测量，以评估目前的设计实践的充分性，并将这些知识应用到高层建筑的结构设计。从这项研究中可以看出，这种超高层建筑的动力响应的振幅相关阻尼的效果是显着的，实际的阻尼特性的知识是非常重要的，在准确预测的风振高层建筑。(C)2003年由爱思唯尔有限公司出版
Full-scale measurements of wind effects on a 70 storey tall building have been conducted. The tall building that has a height of 367 m is the second tallest structure in Hong Kong. The amplitude-dependent characteristics of damping have been obtained by using the random decrement technique from the field measurements of acceleration responses. The objective of this study is to present detailed investigations into the effects of amplitude-dependent damping on the wind-induced responses of the super tall building based on the measured non-linear damping and wind action characteristics. An efficient and less time consuming digital simulation technique is developed to generate time series of turbulent wind loads acting on the tall building based on the measured wind speed records. The predicted dynamic responses of the building using the actual amplitude-dependent damping characteristics are compared with those computed by using constant damping parameters assumed by the structural designers or estimated from the field measurements in order to evaluate the adequacy of current design practices and to apply that knowledge to structural design of tall buildings. It is observed from this study that the effect of amplitude-dependent damping on the dynamic responses of such a super tall building is significant and knowledge of actual damping characteristics is very important in the accurate prediction of wind-induced vibrations of a tall building. (C) 2003 Published by Elsevier Ltd.