EXPERIMENTAL MODAL TEST AND TIME-DOMAIN AERODYNAMIC ANALYSIS OF A CABLE-STAYED BRIDGE
EXPERIMENTAL MODAL TEST AND TIME-DOMAIN AERODYNAMIC ANALYSIS OF A CABLE-STAYED BRIDGE
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DOI：
10.1142/s0219455411004002
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发表时间：
2011-11
影响因子：
3.6
通讯作者：
Chern‐Hwa Chen;C. Ou
中科院分区：
文献类型：
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作者：
Chern‐Hwa Chen;C. Ou
为了确定其在风荷载作用下的实际动力响应，对台湾南部的高平溪斜拉桥进行了现场试验模态识别。连续小波变换算法识别的桥梁的动力特性与有限元分析得到的结果进行了比较。然后根据现场试验结果对有限元模型进行了修正和细化。从更新的有限元模型得到的结果被证明是同意以及与现场识别结果的前几个模式在垂直，横向和扭转方向。这表明，建立的有限元模型是合理的。采用改进的有限元模型，在时域内进行非线性分析，以确定桥梁的抖振响应。通过与频域法计算结果的对比验证，证实了本文采用的时域法适用于斜拉桥抖振分析。
To determine its actual dynamic responses under the wind loads, modal identification from the field tests was carried out for the Kao Ping Hsi cable-stayed bridge in southern Taiwan. The dynamic characteristics of the bridge identified by a continuous wavelet transform algorithm are compared with those obtained by the finite element analysis. The finite element model was then modified and refined based on the field test results. The results obtained from the updated finite element model were shown to agree well with the field identified results for the first few modes in the vertical, transverse, and torsional directions. This has the indication that a rational finite element model has been established for the bridge. With the refined finite element model, a nonlinear analysis in time domain is employed to determine the buffeting response of the bridge. Through validation of the results against those obtained by the frequency domain approach, it is confirmed that the time domain approach adopted herein is applicable for the buffeting analysis of cable-stayed bridges.