SYSTEM IDENTIFICATION OF FEI-TSUI ARCH DAM FROM FORCED VIBRATION AND SEISMIC RESPONSE DATA
SYSTEM IDENTIFICATION OF FEI-TSUI ARCH DAM FROM FORCED VIBRATION AND SEISMIC RESPONSE DATA
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DOI：
10.1080/13632460009350381
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发表时间：
2000-10
影响因子：
2.6
通讯作者：
C. Loh;Tsu-Chiu Wu
中科院分区：
文献类型：
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作者：
C. Loh;Tsu-Chiu Wu
本文介绍了飞咀拱坝的强制振动试验及其地震反应资料。对菲翠大坝进行了强制振动试验，通过试验数据对大坝的动力特性进行了识别。为了从地震响应数据中识别大坝特性，为了考虑地震输入的非均匀激励和描述大坝的整体行为，采用最小二乘估计的多输入/多输出离散时间ARX模型来识别大坝的动力特性。系统的模态频率、阻尼比和频响函数分别由受迫振动和地震响应数据确定。为了验证识别结果的准确性，将离散时间ARX模型与频域条件谱分析进行了比较。最后，研究了自由场峡谷地表地面运动的空间变化规律。
This paper presents the experimental investigation of the Fei-Tsui arch dam using the forced vibration test and its seismic response data. A forced vibration test was conducted on Fei-Tsui dam, this study presents the identified dynamic properties of the dam from these test data. For the identification of dam properties from seismic response data, in order to consider the nonuniform excitation of the seismic input and to describe the global behavior of the dam, the multiple input/multiple output discrete-time ARX model with least square estimation is applied to identify the dynamic characteristics of the dam. The system modal frequency, damping ratio and frequency response function are identified from both the forced vibration and seismic response data. To verify the accuracy of the identification result, comparison between discrete-time ARX model and a frequency domain conditioned spectral analysis was made. Finally, the spatial variation of ground motion across the free-field canyon surface is also studied.