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首页> 外文期刊>Soil Dynamics and Earthquake Engineering >Full-scale experimental modal analysis of an arch dam: The first experience in Iran
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Full-scale experimental modal analysis of an arch dam: The first experience in Iran

机译：拱坝的全尺寸试验模态分析：伊朗的首次经验

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Forced vibration field tests and finite-element studies were conducted on the Shahid Rajaee concrete arch dam in Northern Iran to determine the dynamic properties of the dam-reservoir-foundation system. The first forced vibration tests on the dam were performed with two different types of exciter units, with a limited maximum force, bolted on the dam crest for alternative in-phase and out-of-phase sequencing. Because of an insufficient number of recording sensors, two arrangements of sensors were used to cover sufficient points on the dam crest and one gallery during tests. Two kinds of vibration tests, on-off and frequency sweeping, were carried out on the dam. The primary natural frequencies of the coupled system for both symmetric and anti-symmetric vibration modes were approximated during on-off tests in two types of sequencing of exciters, in phase and out-of-phase, with a maximum frequency of 14 Hz. The principal forced vibration tests were performed at precise resonant frequencies based on the results of the on-off tests in which sweeping around the approximated frequencies at 0.1 Hz increments was performed. Baseline correction and suitable bandpass filtering were applied to the test records and then signal processing was carried out to compute the auto power, cross power and coherence spectra. Nine middle modes of vibration of the coupled system and corresponding damping ratios were estimated. The empirical results are compared against the results from calibrated finite-element modeling of the system using former ambient vibration tests, considering the dam-reservoir-foundation interaction effects. Good agreement is obtained between experimental and numerical results for eight middle modes of the dam-reservoir-foundation system.
机译：在伊朗北部的Shahid Rajaee混凝土拱坝上进行了强制振动场试验和有限元研究，以确定大坝-水库-基础系统的动力特性。对大坝的第一次强制振动测试是用两种不同类型的励磁机进行的，最大激励力有限，用螺栓固定在大坝顶部，以进行同相和异相排序。由于记录传感器的数量不足，因此在测试过程中使用了两种传感器布置来覆盖坝顶上的足够点和一个通道。在大坝上进行了两种振动测试，通断和扫频。耦合系统在对称和反对称振动模式下的主要固有频率均在开/关测试中以两种类型的励磁顺序进行了估计，即同相和异相，最大频率为14 Hz。基于开-关测试的结果，在精确的共振频率下执行了主要的强制振动测试，在该测试中，以0.1 Hz的增量围绕近似频率进行了扫描。将基线校正和合适的带通滤波应用于测试记录，然后进行信号处理以计算自功率，互功率和相干谱。估计了耦合系统的九种中间振动模式和相应的阻尼比。考虑到大坝-水库-地基相互作用的影响，将经验结果与使用以前的环境振动测试的系统校准有限元模型的结果进行比较。大坝-水库-基础系统的八个中间模式的实验结果与数值结果之间取得了很好的一致性。

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