考虑提离-滑移效应的核电结构-界面-地基相互作用模型研究  

Nuclear structure-interface-soil interaction model in consideration of uplift-slip effects

作　　者：胡哲文 李建波[1,2] 李志远 HU Zhewen;LI Jianbo;LI Zhiyuan(State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116024,China;Institute of Earthquake Engineering,Faculty of Infrastructure Engineering,Dalian University of Technology,Dalian 116024,China;Earthquake Engineering Research Center,China Institute of Water Resources and Hydropower Research,Beijing 100048,China)

机构地区：[1]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116024 [2]大连理工大学建设工程学部,辽宁大连116024 [3]中国水利水电科学研究院工程抗震研究中心,北京100048

出　　处：《振动与冲击》2023年第6期126-133,201,共9页Journal of Vibration and Shock

基　　金：国家自然科学基金(52178460,51779222)。

摘　　要：强震作用下,核岛公共筏基可能发生的提离-滑移对结构受力影响明显,精细模拟建基面的接触状态并将结构-界面-地基作为整体分析,有助于明确提离-滑移效应对结构地震反应的影响机理。采用罚函数法接触模型模拟筏基-地基间的接触力学行为,等价线性法描述地基土的动力非线性,黏弹性人工边界模拟半无限地基的辐射阻尼条件,建立考虑提离-滑移效应的结构-界面-地基相互作用模型。进而,以AP1000核岛厂房为例,考虑静-动力综合作用,对比筏基-地基绑定简化模型,结构加速度响应峰值及楼层谱的峰值和形状均发生了明显变化,表明强震作用下筏基提离-滑移对抗震安全性造成不利影响,在核电结构抗震设防时应加以考虑。Under strong earthquake,the possible uplift-slip of the nuclear island common raft has a significant impact on the structural stress state.Refinedly simulating the contact state on the raft-soil interface and analyzing the dynamic behaviors of the structure-interface-soil as a whole are helpful to clarify the influence mechanism of uplift-slip effects on the seismic response of the structure.By applying the penalty function method to simulate the contact mechanical behavior between the raft and the soil,the equivalent linear method for describing dynamic nonlinearity of the soil,and the viscoelastic boundary method for simulating radiation damping condition,a structure-interface-soil interaction model in consideration of uplift-slip effects was established.Furthermore,by applying the proposed model to evaluate the response of AP1000 nuclear island plant,the comparison with the simplified model of the raft-soil binding was achieved in consideration of the combined static and dynamic effects.The results show that the peak of the structure acceleration response and the peak and the shape of the floor response spectrum have an obvious change when considering uplift-slip effects,which indicates that under strong earthquake,uplift-slip of the raft has an adverse effect on the anti-seismic safety.It can be seen that uplift-slip effects should be considered in the seismic fortification of nuclear power structures.

关 键 词：提离-滑移 接触算法 核电结构 土-结构相互作用 强震 

分 类 号：TU.1[建筑科学]