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本文通过我国一座双曲拱坝的动力模型试验,测得了拱坝在空库情况下的共振曲线、前七阶自振频率和相应的位移振型,以及各阶振型应力。在此基础上,按反应谱理论计祘了地震荷载及其分布,并和我国现行的《水工建筑物抗震设计规范》(SDJIO-78)作了对比计算。根据各阶型应力,求出了拱坝上、下游各测点的组合应力。通过试验研究,为工程动力设计提供了科学依据,并对拱坝抗震性能的一些问题以及抗震设计规范提出了一些建议。
In this paper, through a dynamic model test of a double-curvature arch dam in China, the resonance curve, the first seven orders of natural frequencies and the corresponding displacement modes of the arch dam under empty conditions are measured. On this basis, the earthquake load and its distribution were calculated according to the response spectrum theory, and compared with the current China’s “Code for Seismic Design of Hydraulic Structures” (SDJIO-78). Based on the stress of each order, the combined stress of the upper and lower points of the arch dam was determined. Through experimental studies, scientific basis for the dynamic design of the project was provided, and some suggestions on seismic performance of the arch dam and seismic design specifications were put forward.