Scale effects on structural dynamic properties and responses: illustrated on arch dams

Scale effects on structural dynamic properties and responses: illustrated on arch dams
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尺度对结构动态特性和响应的影响:以拱坝为例

DOI:
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发表时间:
2014-12
影响因子:
1
通讯作者:
Maosen Cao
Maosen Cao
中科院分区:
--
文献类型:
--
作者:
Wang Shanshan;Zhao Zhenhua;Maosen Cao

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考虑结构尺度效应的重要性日益增加,需要更好地理解这种效应及其对结构性能的影响。为此,本文分别以1/1500和1/3000缩尺的小湾拱坝模型为研究对象,通过数值模拟和试验研究了缩尺效应对结构动力特性和响应的影响。从试验方面,试验模态分析表明,小拱坝模型的自振频率大于大拱坝模型的自振频率,且两个模型的振型相似。五个不同的激励水平被用来澄清模型的随机响应特性,在所有情况下观察到的垂直和水平方向上的最大速度响应相似。从数值计算方面,采用有限元方法对相应的模拟拱坝模型进行了结构动力特性和响应分析。数值计算得到的最大速度响应与试验结果具有相同的规律性,表明数值模拟在分析结构动力特性和响应的尺寸效应方面是有效的。
The increasing importance of considering structural scale effects demands better understanding of such effects and their influence on structural properties. To this end, two models of the full-scale Xiaowan Arch Dam, at 1/1500-scale and 1/3000-scale units respectively, are elaborated to numerically and experimentally investigate scale effects on structural dynamic properties and responses. From the experimental aspect, experimental modal analysis shows that the natural frequency of the small arch dam model is greater than that of the large arch dam model, and the two models have similar mode shapes. Five different levels of excitation are used to clarify the random response characteristics of the models, with similar maximal velocity responses in the vertical and horizontal directions observed in all cases. From the numerical aspect, the finite element method is used to analyze the structural dynamic properties and responses of the corresponding simulated arch dam models. The numerical maximum velocity responses have the same orderliness as those from the experiments, indicating the effectiveness of numerical simulation in analyzing size effects on structural dynamic properties and responses.
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