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

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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，粘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。

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	胡哲文1
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	李建波1
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关键词 ：提离-滑移, 接触算法, 核电结构, 土-结构相互作用, 强震

Abstract：Under strong earthquake, the possible uplift-slip of the nuclear island common raft has a significant impact on the structural stress state. Refined simulation of the contact state on raft-soil interface and analyzing 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 contact model named 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 of the simplified model of the raft-soil binding was achieved in consideration of the combined static and dynamic effects. The results showed that the peak of the structure acceleration response and the peak and the shape of the floor response spectrum changed obviously, which indicated that under strong earthquake uplift-slip of the raft had 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.

Key words： uplift-slip contact algorithm nuclear power structure soil-structure interaction strong earthquake

收稿日期: 2021-11-01 出版日期: 2023-03-28

引用本文:

胡哲文1,2，李建波1,2，李志远1,2. 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[J]. 振动与冲击, 2023, 42(6): 126-133.
HU Zhewen1,2，LI Jianbo1,2，LI Zhiyuan1,2. Nuclear structure-interface-soil interaction model in consideration of uplift-slip effects. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(6): 126-133.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2023/V42/I6/126

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