应用三维有限元动力分析方法，建立大型U形双渡槽结构动力分析有限元模型，计算其在不同过水工况下的自振特性，并采用振型分解反应谱法分别按水工建筑物抗震设计的规范谱和穿黄工程场地危险性分析确定的场地谱计算渡槽的地震动力响应。结果表明：槽中水体对渡槽的自振特性影响显著；按场地谱计算的动力响应约是规范谱的3倍；支撑结构是渡槽抗震的薄弱环节。

Aseismic analysis on the aqueduct across the Yellow River was conducted by 3－D FEM under different working conditions. The aqueduct adopted double U－shaped section. The vibration frequencies, corresponding modal vibration shapes, and dynamic respones of the structure based on two spectrums,i.e., one was provided from the specifications for seismic design of hydraulic
structures and the other was obtianed from earth risk analysis of the field, were calculated. The results showed that: the influence of the water body in the aqueduct on vibration characteristics of the aqueduct is distinct; the dynamic respone calculated from the field is about 3 times that defined by specifications; the supporting structure is the weak position of the aqueduct.