非基岩场地基础隔震核岛厂房抗震性能分析  

Seismic performance analysis of base-isolated nuclear island building in nonrocky soils

作　　者：刘宇 李建波[1,2] 丁志新[3] 林皋 LIU Yu;LI Jianbo;DING Zhixin;LIN Gao(State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116024,China;Institute of Earthquake Engineering,School of Infrastructure Engineering,Dalian University of Technology,Dalian 116024,China;State Key Laboratory of Nuclear Power Safety Monitoring Technology and Equipment,China Nuclear Power Engineering Co.,Ltd.,Shenzhen 518172,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院工程抗震研究所,辽宁大连116024 [3]中广核工程有限公司核电安全监控技术与装备国家重点实验室,广东深圳518172

出　　处：《哈尔滨工程大学学报》2024年第9期1679-1686,共8页Journal of Harbin Engineering University

基　　金：国家自然科学基金项目(52178460).

摘　　要：为了研究非基岩场地条件下基础隔震核电工程结构的抗震性能,本文依据外源波动理论提出了考虑土-结构相互作用效应的基础隔震核电工程结构抗震分析方法,该方法实现了地震动的高精度输入以及整体系统的直接求解,通过与传统封闭体系振动法计算结果的对比验证了其有效性。建立了基础隔震核岛厂房-地基整体有限元模型,开展了核岛厂房地震响应分析,讨论了不同剪切波速场地条件下核岛厂房的基础隔震性能。研究结果表明:非基岩场地条件下基础隔震核岛厂房表现出良好的隔震效果;随着场地剪切波速的降低,基础隔震的隔震能力逐渐下降,与剪切波速为1067 m/s的场地相比,当场地的剪切波速为305 m/s时,核岛厂房结构顶部的楼层反应谱、加速度放大系数和层间位移角的隔震率分别减小了14.30%、13.50%和23.41%。为了保证核电工程结构的安全性,在基础隔震设计中应充分考虑非基岩场地条件下的SSI效应。To investigate the seismic performance of base-isolated nuclear power plants in nonrocky soils,a seismic soil-structure interaction(SSI)analysis method for nuclear power engineering structures based on the theory of ex-ternal source wave motion is proposed.This method achieves high-precision input of seismic motion and direct solu-tion of the overall system,with its efficacy confirmed by comparison with the traditional vibration method of a closed system.Furthermore,a comprehensive finite element model of a base-isolated nuclear island building-soil system was established.Seismic response analysis was conducted,and the seismic isolation performance of the nuclear is-land building in nonrocky soils with different shear wave velocities was discussed.The research findings indicated that in nonrocky soils,the base-isolated nuclear island building exhibited remarkable seismic isolation effects.As the shear wave velocity of the site decreased,the seismic isolation capacity of the base isolation gradually de-creased.Compared with a site with a shear wave velocity of 1067 m/s,when the shear wave velocity of the site was 305 m/s,the seismic isolation rates of the floor response spectra,acceleration amplification factor,and inter-story displacement angle at the top of the nuclear island building structure decreased by 14.30%,13.50%,and 23.41%,respectively.To ensure the safety of nuclear power plants,SSI effects on nonrocky soils should be fully considered in base isolation designs.

关 键 词：基础隔震 核岛厂房 非基岩场地 土-结构相互作用 外源波动 振动法 剪切波速 地震响应 

分 类 号：TU352.1[建筑科学—结构工程]