Finite element model calibration of berke arch dam using operational modal testing
Finite element model calibration of berke arch dam using operational modal testing
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DOI：
10.1177/1077546310377912
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发表时间：
2011-06
影响因子：
2.8
通讯作者：
B. Sevim;A. Bayraktar;A. Altunışık
中科院分区：
文献类型：
--
作者：
B. Sevim;A. Bayraktar;A. Altunışık
本文介绍了利用运行模态试验对伯克拱坝进行有限元标定的方法。实现这一目的涉及结构振动特性的伯克拱坝使用的分析和运行模态分析。因此，本研究分为分析和实验两部分。在分析部分，利用ANSYS软件建立了伯克拱坝-库水-地基系统的三维有限元模型，分析了该系统的自振频率和振型等振动特性。在研究的实验部分，敏感的加速度计被放置到Berke拱坝的几个点，并进行了为期四天的环境振动试验，以获得动力特性。采用增强频域分解技术对Berke拱坝的自振频率、振型和阻尼比进行了试验估计。结果表明，大坝的理论自振频率与试验自振频率存在一定的差异。因此，Berke拱坝的分析模型进行了校准，以尽量减少这些差异，通过改变材料性能。由标定模型得到的分析结果与实验模型的分析结果基本一致。
This paper presents the finite element calibration of Berke Arch Dam by using Operational Modal Testing. Achievement of this purpose involves structural vibration characteristics of Berke Arch Dam using analytical and Operational Modal Analyses. Therefore, the study has two parts — analytical and experimental. In the analytical part of the study, the authors developed a 3D finite element model of Berke Arch Dam-reservoir-foundation system using ANSYS software, and analytically determined vibration characteristics such as natural frequencies and mode shapes. In the experimental part of the study, sensitive accelerometers were placed to several points of Berke Arch Dam, and ambient vibration tests were conducted over four days to obtain dynamic characteristics. The Enhanced Frequency Domain Decomposition technique is used to estimate natural frequencies, mode shapes and damping ratios of the Berke Arch Dam experimentally. Results showed that there were some differences between analytical and experimental natural frequencies of the dam. Therefore, an analytical model of Berke Arch Dam was calibrated to minimize these differences by changing material properties. Analytical results obtained from the calibrated model mainly conform to those of the experimental model.