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为研究地震波非一致输入对三维高面板坝动力反应的影响,采用波场分离的思路将人工动力边界处的总波场分解为无局部场地效应影响的自由场和局部场地效应引起的散射场,借助黏弹性边界建立地震波在自由场作用下地震动非一致输入,实现考虑地基辐射阻尼和地震波行波效应的地震动输入。对我国西南地区某高面板坝进行非一致地震动反应分析,研究P波和SV波作用下坝体结构的动力反应规律。结果表明:当P波非一致输入时,随着入射角度的增加,竖向加速度和动位移极值逐渐减小,水平向加速度和动位移极值逐渐增大;SV波非一致输入时,地震动反应规律与P波入射时相反。入射角度对地震波的行波效应以及坝顶加速度反应谱幅值等都有较显著的影响。
In order to study the influence of non-uniform input of seismic wave on the dynamic response of a three-dimensional high-rise dam, the wave field separation method is used to decompose the total wave field at the boundary of artificial dynamic force into a free field with no local field effect and a scattering field caused by local field effect. The viscoelastic boundary is used to establish the non-uniform ground motions of the seismic wave under the action of the free field, so that the ground motion input considering the radiation damping of the foundation and the seismic wave traveling wave effect can be realized. In this paper, a non-uniform seismic response analysis is carried out on a high-panel dam in the southwest of China, and the dynamic response of the dam structure under P and SV waves is studied. The results show that the vertical accelerations and the moving extremums decrease with the increase of the incident angle, and the horizontal accelerations and the moving extremum extremums gradually increase with the incident angle increasing. When the SV waves are not uniformly input, the earthquakes Dynamic response law and P wave incident on the contrary. The incidence angle has a more significant influence on the traveling wave effect of seismic wave and amplitude of response spectrum of dam top.