杨房沟拱坝的动力响应分析  

Dynamic response analysis of Yangfanggou Arch Dam

作　　者：李德玉[1,2] 张伯艳[2] 王立涛[2] 

机构地区：[1]西安理工大学水利水电学院,陕西西安710048 [2]中国水利水电科学研究院工程抗震研究中心,北京100048

出　　处：《水利学报》2013年第12期1448-1454,共7页Journal of Hydraulic Engineering

基　　金：水利部公益性行业科研专项(201001035;200901054)

摘　　要：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, located in the meizoseismal area, is concerned by many researchers. In this paper, The Lagrangian Discontinuous Deformation Analysis （LDDA） is imple- mented to model the movement of arch dam contraction joints. Viscoelastic boundary is used as energy ab- sorbing boundary to simulate infinite foundation radiation damping, and the earthquake free field input mod- el of arch dams is established. The dynamic response analysis of the Yangfanggou Arch Dam is performed, and then, the influence of the radiation damping and arch dam contraction joints on the stresses of arch dam, the open of contraction joints of arch dam under earthquake action, and the compound stress of stat- ic and dynamic on dam are deeply analyzed. Major results can be concluded as follows： dynamic responses of the Yangfanggou Arch Dam significantly decrease in the case of considering open joints and foundation radiation damping effects; dam contraction joints maximum opening is 6 mm, in the range of permissible deformation of joints sealing; on the basis of further optimization of the dam body, the Yangfanggou Arch Dam subjected to design earthquake seismic safety can be guaranteed.

关 键 词：拱坝 横缝 辐射阻尼 黏弹性边界 

分 类 号：TV642.4[水利工程—水利水电工程]