重力坝动水压力与地震干扰频率的关系

THE RELATIONSHIP OF HYDRODYNAMIC PRESSURES ON STRUCTURES WITH THE EXCITATION FREQUENCY

地震时大坝坝体与水体的动力作用是水工抗震分析中的重要问题 ,特别是水体的可压缩性对动水压力的影响一直是水工结构设计和研究者所关心的问题。作者从解析解和有限元数值解的角度详细分析了库水动水压力与干扰频率的关系 ,实际的计算表明 。

It is an important problem in engineering to analyze the hydrodynamic effect of earthquakes (specially the influence of compressibility of water) on structures. This paper uses the analytical solution and finite element to analyze the two dimensional response of structure reservoir system subjected to horizontal ground motion. The compressibility of water is taken into account. Comparing with the incompressibility of water, if the earthquake's frequency is close to the first mode of the water, the influence of compressibility of water is large. Even if the earthquake's frequency is equal to the first mode of water, resonance will happen. So it can be concluded that the effect of compressibility of water is considerable for designing dam, specially the high dam.