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强震区的杨房沟拱坝的抗震安全问题为众多研究者所关注。本文用拉格朗日不连续变形分析(LDDA)模拟拱坝横缝,采用黏弹性边界作为吸能边界来模拟无限地基辐射阻尼,建立了拱坝地震自由场输入模型,进行了杨房沟拱坝动力响应分析,对辐射阻尼和拱坝横缝对坝体应力的影响、拱坝横缝在地震作用下的张开情况以及坝体静动综合应力进行了分析,得出了如下结论,考虑坝体横缝张开和地基辐射阻尼效应影响后,杨房沟拱坝的地震动力响应明显降低,大坝横缝张开度最大为6mm,在横缝止水可允许的变形范围之内,在进一步优化大坝体型基础上,杨房沟拱坝在设计地震作用下的抗震安全是可以保证的。
The seismic safety of Yangfanggou arch dam in strong earthquake area is of concern to many researchers. In this paper, Lagrangian Discontinuous Deformation Analysis (LDDA) is used to simulate the transverse joint of arch dam. The viscoelastic boundary is used as the energy absorbing boundary to simulate the radiative damping of infinite foundation. The input model of free-field of arch dam is established. Dam dynamic response analysis of the radiation damping and arch dam horizontal joint impact on the dam stress, arch dam transverse joints under the action of the earthquake and the comprehensive analysis of the static and dynamic dam structure, reached the following conclusions, consider the The seismic response of Yangfanggou arch dam is obviously reduced after the transverse joint of dam is open and the radiation damping effect of foundation is affected. The maximum of transverse joint opening of dam is 6mm. Within the allowable deformation range of transverse joint sealing, On the basis of optimizing dam body shape, the seismic safety of Yangfanggou Arch Dam under design earthquake can be guaranteed.