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本文是结合我国一个位于7°度地震区的水电工程大坝对大头坝所进行的动力分析。采用理论计算和模型试验方法,研究在空库和水平纵向地震作用下大坝的自振特性以及转动惯量和载面剪力不均匀系数变化对自振特性的影响。原设计拟在支墩周围回填砂砾石料以增强坝体抗震性能,我们采用模型试验分析验证对比后,认为这种工程措施并无明显效果。最后还按反应谱理论计算了地震荷载和内力,并根据现行规范中关于地震惯性力计算公式计算地震惯性力与反应谱理论计算成果作了对比。
This paper is a dynamic analysis of Datouba with a hydropower project dam located in an earthquake zone of 7° in China. Using theoretical calculations and model test methods, the influence of the natural vibration characteristics of the dam and the variation of the inertia coefficient and the non-uniform shear coefficient on the natural vibration characteristics of the dam under the action of the empty reservoir and the horizontal longitudinal earthquake are studied. The original design plans to backfill sand and gravel material around the piers to enhance the seismic performance of the dam. We use model test analysis to verify and compare and conclude that this engineering measure has no significant effect. Finally, the seismic load and internal force are calculated according to the response spectrum theory, and the theoretical calculation results of the earthquake inertial force and the response spectrum calculated according to the calculation formula of the earthquake inertia force in the current specification are compared.