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针对高拱坝抗震研究的需要,完成了有限元边界元无限边界元耦合模型地震非均匀自由场输入下的拱坝非线性反应分析。用此模型对溪洛渡拱坝进行计算分析的结果显示:非均匀自由场幅差和相差对拱坝反应有显著的影响,一方面幅差和相差带来结点运动的相互牵掣,降低拱坝主体的响应,另一方面强化了局部扭曲,在某些情况下可能带来局部拉应力和横缝开度的大幅度升高,而且可能会改变坝体动力反应机制和规律。因此对重要的高拱坝抗震设计,有必要考虑横缝非线性、地基辐射阻尼及自由场幅差和相差的影响。
Aiming at the seismic research of high arch dam, the nonlinear response analysis of arch dam under non-uniform free-field input of bounded finite element finite element boundary element coupled seismic model is completed. The result of calculation and analysis of Xiluodu arch dam shows that the amplitude and phase difference of non-uniform free field have a significant influence on the response of arch dam. On the one hand, the amplitude difference and the phase difference bring the mutual movement of nodes, The response of the main body, on the other hand, intensifies the local distortion, which in some cases may bring about a substantial increase of local tensile stress and transverse joint opening, and may change the dynamic response mechanism and regularity of the dam body. Therefore, for the important seismic design of high arch dam, it is necessary to consider the influence of the transverse joint nonlinearity, the radiative damping of the foundation and the difference of free field amplitude and phase difference.