考虑横缝非线性对沙牌拱坝动力响应的影响  

Effects of Considering Nonlinear Contact of Transverse Joints on Dynamic Response of Shapai Arch Dam

作　　者：戚翔宇[1] 赵兰浩[1] 王锦锋[1] 

机构地区：[1]河海大学水利水电学院,江苏210098

出　　处：《科学技术与工程》2014年第8期70-74,共5页Science Technology and Engineering

基　　金：水利部公益性行业科研专项经费项目(201301058);国家高技术研究发展计划(863计划)课题(2012AA112507)资助

摘　　要：强震作用下横缝的开合对拱坝的动力响应有着显著的影响。结合实际工程,依据最新的坝体参数资料,建立了考虑拱坝横缝非线性的有限元模型。用黏弹性人工边界计及地基的辐射阻尼效应,采用有限元混合法模拟横缝的非线性行为。给出了四种工况,从坝体的应力分布、顺河向位移及横缝的张开变化等角度,研究了橫缝非线性对沙牌拱坝动力响应的影响。结果表明:横缝的张开使坝体的拱向应力得到了明显的释放,拱梁之间存在着一定程度的应力重分布;随着库水位的降低,横缝的开度增大的趋势较为明显,但坝体顺河向位移的变化不是很明显。Transverse joints play a significant role in the nonlinear response of high arch dams to strong earth- quakes through opening and closing. In connection with a practical project, a mixed finite element method was adopted to simulate the nonlinear behavior of the joins, with the foundation radiation damping accounted by a viscoe- lastic artificial boundary condition. Four models of different numerical schemes were used to analyze the dynamic characteristics of high arch dams from the stress distribution, longitudinal displacement and transverse joints opening of the dam. Results show transverse joints opening make the arch stress of the dam release clearly, there is a certain degree of stress redistribution between arch and cantilever; and then, with the reduction of the reservoir water level, increasing trend of the transverse joints opening is more obvious, but the change of longitudinal displacement is not very obvious.

关 键 词：沙牌拱坝 横缝 非线性 动力分析 坝体-库水-地基系统 

分 类 号：TV312[水利工程—水工结构工程]