核电站取水结构动力反应及抗震性能分析  

Seismic responses and capacity analyses of water-intaking structure in a nuclear power station

作　　者：张轶群[1] 方火浪[1] 郭婧[1] 曾泽斌[2] 

机构地区：[1]浙江大学防灾工程研究所,浙江杭州310058 [2]浙江理工大学机械与自动控制学院,浙江杭州310018

出　　处：《地震工程与工程振动》2015年第3期1-7,共7页Earthquake Engineering and Engineering Dynamics

基　　金：国际合作项目

摘　　要：利用基于考虑钢筋和混凝土材料非线性的纤维单元模型及土体动力弹塑性模型的有限元程序Open Sees,建立土-结构二维平面应变有限元模型,对强震作用下国外某核电站取水结构进行弹塑性动力时程分析。研究取水结构以及地基土的地震动力反应特性,并对取水结构的变形性能和承载能力进行评估。结果表明,在设计基准地震作用下,取水结构与周围土体的变形呈现出较大的非线性,土体变形以剪切为主,其值随深度的增加逐渐减小。受土-结构动力相互作用的影响,取水结构周围土体的加速度反应较大。取水结构的最大内力和最大抗剪需求能力比分别发生在下层侧壁与底板相交的角点处和靠近侧壁的底板端部。取水结构的层间位移角和抗剪承载力均满足规范规定的抗震安全性要求,并且具有一定的安全裕度。By use of the finite element program OpenSees with a fiber model for nonlinear reinforced concrete materials and a dynamic elasto-plastic model for soils, a two dimensional soil-structure plane strain finite element model is built for the water-intaking structure and its surrounding soils of a nuclear power station abroad. Based on the model, the dynamic elasto-plastic time history analysis is carried out and the seismic response and capacity of the water-intaking structure is investigated under the strong earthquake. The results show that the water-intaking structure and its surrounding soils exhibit large nonlinear deformations under the design basis earthquake. The soil deformation is mainly induced by shearing and its value decreases with the increase of the depth of the position. The strong acceleration responses happen in surrounding soils of the structure due to the soil-structure dynamic interac- tion. The maximum internal force and the maximum shear demand capacity ratio occur at corners of the side wall and the bottom slab and at ends of the bottom slab, respectively. The inter-story displacement angle and the shear capacity of the structure can meet the requirement of seismic safety according to the seismic fortification criteria for nuclear power station. Moreover, there is an enough safety margin in the deformation and shear capacity of the structure.

关 键 词：取水结构 地震 动力反应 纤维模型 

分 类 号：TL48[核科学技术—核技术及应用] TU317.1[建筑科学—结构工程]