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首页> 外文期刊>Journal of earthquake and tsunami >Response of concrete dams on rigid and soil foundations under earthquake loading
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Response of concrete dams on rigid and soil foundations under earthquake loading

机译：地震荷载下混凝土坝对刚性基础和土性基础的响应

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Dynamic response of dams under earthquake loading depends on their foundation stiffness. Additional hydrodynamic pressures are generated not only by the ground motions but also due to the dynamic response of the dam to the ground motions. The magnitude and distribution of hydrodynamic pressures vary and these effect the deformation of dam which in turn influences the pressure. This paper aims at investigating the effect of damfoundation interaction on the dynamic response and consequent development of hydrodynamic pressure on dam face using dynamic centrifuge modelling technique. From a series of centrifuge tests it was found that the inclusion of a flexible foundation significantly reduces the dynamic response of the dam. Significant correlation was also observed between the dynamic response of dams and the hydrodynamic pressures developed on their faces. Comparisons with theoretical hydrodynamic pressures show that Westergaard's equation gives a conservative estimation of hydrodynamic pressures during most nonresonant vibrations. Comparison with Chopra's method revealed that it severely underpredicts hydrodynamic pressures for low reservoir depths. However, it yields a reasonably good approximation of the hydrodynamic pressures for higher depth of reservoirs during nonresonant vibration.
机译：大坝在地震作用下的动力响应取决于其基础刚度。附加的水动力压力不仅由地震动产生，而且还由于大坝对地震动的动态响应而产生。流体动力压力的大小和分布会发生变化，这些都会影响坝体的变形，进而影响压力。本文旨在利用动态离心建模技术研究坝基相互作用对坝体动力响应的影响，进而研究坝面水动力压力的产生。从一系列的离心测试中发现，柔性基础的加入大大降低了大坝的动力响应。在大坝的动力响应和坝面上所产生的水动力压力之间也发现了显着的相关性。与理论流体动力压力的比较表明，Westergaard方程可对大多数非共振振动过程中的流体动力压力进行保守估计。与Chopra方法的比较表明，对于低储层深度，它严重低估了流体动力压力。但是，对于非共振振动过程中较高的储层深度，它可以得出合理的流体动力压力近似值。

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