混凝土重力坝全坝段三维动力分析  

Seismic analyses of concrete gravity dam with 3D full-dam model

作　　者：王海波[1] 杨会臣[1] 

机构地区：[1]中国水利水电科学研究院流域水循环模拟与调控国家重点实验室,北京100038

出　　处：《水力发电学报》2011年第6期133-137,共5页Journal of Hydroelectric Engineering

基　　金：水利部公益性行业科研专项(200901054)

摘　　要：混凝土重力坝抗震分析多针对典型坝段采用二维模型进行。但对于较窄河谷、地震烈度较高等情况,坝段间的动力相互作用对重力坝的地震影响不可忽视。本文采用全坝段三维有限元模型、计入地基辐射阻尼、坝段间动态接触等影响混凝土重力坝地震响应的关键因素,研究分析高烈度区混凝土重力坝地震响应,并与坝段三维模型、无质量地基模型、无横缝整体坝模型的分析结果进行对比,揭示各种因素对混凝土重力坝地震响应的影响,并提出提高坝体抗震能力的工程措施。Seismic analyses of concrete gravity dams are usually idealized as two-dimensional structures.For gravity dams built in narrow valleys or on sites of high seismicity,however,interaction between adjacent dam blocks may influence their seismic responses significantly.In this paper,a three-dimensional full-dam FEM model are adopted to analyze the seismic responses of a concrete gravity dam,with consideration of the dynamic interaction between dam-foundation,dam-water,energy radiation and dynamic contact of monoliths,etc.Comparison are made between the numerical results of single-monolith model,massless-foundation full-dam model and full-dam model with or without contraction joints.The influences of various factors are discussed and engineering measures for improvement of aseismic ability of gravity dams are suggested.

关 键 词：水工结构 地震响应 三维动力有限元法 混凝土重力坝 全坝段 

分 类 号：TV312[水利工程—水工结构工程]