复杂非均质场地条件下核电厂联合泵房抗震安全性评价分析  

Seismic safety evaluation analysis of pumping station of nuclear power plant under complex heterogeneous site condition

作　　者：尹训强 孙华跃 YIN Xunqiang;SUN Huayue(College of Civil Engineering and Architecture,Dalian University,Dalian 116622,China)

机构地区：[1]大连大学建筑工程学院,辽宁大连116622

出　　处：《地震工程与工程振动》2023年第4期226-234,共9页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(52108437,U1839202);大连市青年科技之星项目(2020RQ057)。

摘　　要：鉴于核电厂选址的愈发复杂多样性,合理有效地模拟复杂非均质地基条件下抗震I类物项结构的静动力耦合响应是进行抗震安全性评价的关键技术问题。以某核电厂联合泵房的实际厂址地基为背景,针对静动力分析中的边界处理问题,基于Newmark隐式积分特点和黏弹性人工边界理论,提出了一种适于静动力耦合分析求解的人工边界模型,并通过创建无厚度紧支黏弹性人工边界单元实现了所开发模型在ANSYS平台的嵌入。进而,通过联合泵房结构静力分析与极大初始时间步分析的对比,验证所提出模型的合理可靠性。最后,从结构应力、响应及地基稳定性等方面对联合泵房进行了综合评价,并就地基局部非均质的影响进行探讨。研究结果表明:实际厂址中局部捕虏体的存在对联合泵房结构的地震响应及地基安全性影响较小,且所建立模型具有较好地解决非线性动力相互作用问题的潜力。Considering the increasing complexity and diversity of nuclear power plant(NPP)site selection,the reasonable and effective simulation of the static-dynamic coupling response of seismic I item structures under complex heterogeneous site conditions is a key technical issue for seismic safety evaluation.Taking the actual complex heterogeneous foundation of pumping station of a NPP as the background,a viscoelastic artificial boundary model suitable for static-dynamic coupling analysis is proposed by the theory of viscoelastic artificial boundary and the characteristics of Newmark implicit integration for solving the boundary problem in static-dynamic coupling analysis.And the developed model is embedded in the ANSYS platform by creating a non-thickness compact viscoelastic artificial boundary element.Furthermore,the reasonable applicability of the developed model was verified through the comparison of the static analysis and the maximum initial time step analysis of the pumping station structure.Finally,the pumping station was comprehensively evaluated from the discussion of structural stress,response and foundation stability,and the influence of local non-homogeneity in ground was discussed.The results show that the measured underground xenolith may have a slight influence on the seismic response and foundation safety of pumping station structure,and the proposed model has the potential to solve the nonlinear dynamic interaction problem.

关 键 词：联合泵房 Newmark隐式算法 复杂非均质地基 黏弹性人工边界 

分 类 号：TU473[建筑科学—结构工程]