桩-土-结构相互作用对非基岩核电站安全厂房地震响应的影响  

Infulence of pile-soil-structure interaction on seismic response of non-bedrock nuclear power plant building

作　　者：董瑞 景立平[1,2,3] 单振东 齐文浩[1,2] DONG Rui;JING Liping;SHAN Zhendong;QI Wenhao(Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China;Key Laboratory of Earthquake Disaster Mitigation,Ministry of Emergency Management,Harbin 150080,China;Institute of Disaster Prevention,Langfang 065201,China)

机构地区：[1]中国地震局工程力学研究所地震工程与工程振动重点实验室,黑龙江哈尔滨150080 [2]地震灾害防治应急管理部重点实验室,黑龙江哈尔滨,150080 [3]防灾科技学院,河北廊坊065201

出　　处：《地震工程与工程振动》2022年第4期229-238,共10页Earthquake Engineering and Engineering Dynamics

基　　金：中国地震局工程力学研究所基本科研业务费专项资助项目(2021B05,2019B10);国家自然科学基金项目(51808515);黑龙江省自然科学基金项目(LH2020E020)。

摘　　要：针对我国某核电站,建立土质地基条件地基-基础-核岛结构的整体有限元模型。分别针对核岛结构、土-桩-核岛结构、土-箱形基础-核岛结构进行模态分析,获取非基岩核电结构的振动模态;采用显示动力时程分析方法对地基-基础-核岛结构整体模型进行反应分析。研究结果表明:桩基础可以明显增强地基的竖向刚度和上部结构的抗倾覆能力;与箱形基础相比,桩基础减小了上部结构的摇摆响应和竖向响应,但是会增大上部结构对水平向加速度的放大效应及楼板反应谱高频(3~6 Hz)响应;核岛结构受到惯性作用会在桩头产生较大的弯矩和剪力,设计时不可忽略桩头受到的弯剪作用;当核岛埋置深度较大且设置了箱形基础时,桩头被约束在一个较刚性的平面内,桩基荷载再分配效应减弱,角桩的地震危险性最大、边桩次之、中心桩最小。The whole finite element model of soil-foundation-nuclear power plant under soil foundation condition is established for nuclear power plant of China.Modal analysis of nuclear power plant,soil-pile-nuclear power plant model and soil-box foundation-nuclear power plant model is carried out to obtain the vibration modes of non-bedrock nuclear power plant.The response analysis of the whole soil-foundation-nuclear power plant model is carried out by explicit dynamic time-history analysis method.Research shows:The pile foundation can obviously enhance the vertical stiffness of the foundation and the anti-overturning ability of the superstructure.Comparing with the box foundation,the pile foundation reduces the sway and vertical response of the superstructure,but increases the amplification effect of the superstructure to the horizontal acceleration and the high-frequency response of the floor response spectrum(3~6 Hz).The inertia action of nuclear power plant will produce large bending moment and shear force at pile head,so the bending and shear action of pile head should not be ignored in design.When the depth of the nuclear island is large and the box foundation is set,the pile head is constrained in a relatively rigid plane,the load redistribution effect of pile foundation is weakened,and the seismic risk of the angle pile is the largest,the side pile is the second,and the central pile is the smallest.

关 键 词：非基岩核电站 桩-土-结构相互作用 有限单元法 地震反应分析 

分 类 号：TU470.3[建筑科学—结构工程]