摘要
针对含有硬夹层的土层场地,考虑地基与结构之间动力相互作用的情况下,采用频域分析方法分析场地土层中的硬夹层对某核电厂结构地震响应的影响,计算了不同硬夹层场地情况下核电厂结构的地震动峰值加速度和加速度反应谱响应值,探讨了硬夹层场地上核电厂结构的地震响应特征.计算结果表明:核岛结构地震响应的峰值加速度和加速度反应谱受场地中硬夹层厚度影响而改变,其影响不可忽视.场地中存在硬夹层总体上会减小核岛结构的水平向响应而增大竖直向响应,对较高频段谱和峰值加速度值的影响更为显著,但硬夹层厚度很大时,其影响趋势出现相反的结果,会增大结构的水平向响应而减小其竖直向响应;场地中硬夹层对核岛结构响应的影响特征较为复杂,尤其会改变核电结构响应的频谱特性,其影响程度与覆盖土层厚度、硬夹层厚度以及输入地震动特性、核电厂结构特性等均有密切关系.核电厂选址在有硬夹层的场地时,应特别关注其对核电厂结构地震响应的不利影响,为实际核电工程选址及结构抗震能力评估提供合理的地震动输入.
In view of the dynamic interaction between the foundation and the structure,the influence of hard interlayers on the structural seismic response of a nuclear power plant was analyzed by the frequency-domain analysis method.The peak acceleration and the response spectrum of the seismic response of the nuclear power plant on the soil sites with different types of hard interlayers were calculated,and the seismic response characteristics of the structure on the soil site with hard interlayers were explored.The results show that the peak acceleration and acceleration response spectrum of the seismic response of the nuclear power plant structure are affected by the thickness of the hard interlayers in the site,and the effect is not negligible.The hard interlayers in the site generally reduces the horizontal response of the nuclear power plant structure,and increases the vertical response,and it has a more significant impact on the higher frequency band spectrum and the peak acceleration value,but when the thickness of the hard interlayers is large enough,the effect trend has the opposite result,the horizontal direction response of the structure is increased and the vertical response is reduced.The influence characteristic of the hard interlayers in the site on the structure response is more complex,especially the spectral characteristics of structure response will be changed.The influence degree is closely related to the thickness of the covering soil,the thickness of the hard interlayers,the characteristics of the input ground motion and the structural characteristics of the nuclear power plant.When the nuclear power plant is located in a site with a hard interlayers,special attention should be paid to its adverse effects on the seismic response of the structure,so as to provide reasonable ground motion input for the site selection of actual nuclear power projects and the evaluation of structural seismic capacity.
作者
戴志军
李小军
侯春林
DAI Zhijun;LI Xiaojun;HOU Chunlin(Institute of Geophysics,China Earthquake Administration,Beijing 100081,China;College of Architecture and Civil Engineering,Beijing University of Technology,Beijing 100124,China;Nuclear and Radiation Safety Centre,Ministry of Ecology and Environment of China,Beijing 100082,China)
出处
《应用基础与工程科学学报》
EI
CSCD
北大核心
2019年第6期1285-1293,共9页
Journal of Basic Science and Engineering
基金
国家自然科学基金项目(51738001)
国家重点研发计划项目(2017YFC1500400).
关键词
核电厂
土-结相互作用
硬夹层
地震响应
nuclear power plant
soil-structure interaction
hard interlayer
seismic response
作者简介
戴志军(1981—),男,博士,副研究员.E-mail:dai.zhijun@gmail.com;通信作者:李小军(1965—),男,研究员,博士生导师.E-mail:beerli@vip.sina.com
