摘要
核岛厂房通常采用厚墙、厚板的钢筋混凝土结构,相比较柔的民用结构,存在自振频率大于刚性反应频率f_(ZPA)的重要振型。采用模态叠加时程分析法计算地震楼层反应谱时,没必要也不可能包含结构的所有模态,这就不可避免忽略了高阶振型对应的贡献(残余刚性反应)。本文基于结构振型参与系数的性质,结合美国核管会(NRC)2006年发布的导则RG1.92-R2,介绍了核岛厂房地震楼层反应谱分析中考虑残余刚性反应的丢失质量法。并以实例形式分析了残余刚性反应对核岛厂房地震楼层反应谱的影响,验证了在核岛厂房地震楼层反应谱计算中考虑丢失质量产生的残余刚性反应的必要性。
The nuclear island building usually adopts reinforced concrete structure with thick walls and slabs.Unlike relatively flexible civil structures,nuclear power plant structures may have important natural vibration modes at frequencies higher than the ZPA frequency f_(zpa).It is not practical to accurately calculate all modes when calculating the floor response spectrum using the modal superposition time history analysis.If only modes with frequencies below.f_(zpa)are included in the dynamic analysis,the contribution of modes with frequencies higher than f_(zpa) named residual rigid response are inevitably ignored.Based on the nature of modal participation factor,combined with the improved modal response combination method including the modal rigid response components specified in the regulatory guide RG1.92-R2 issued by 2006 Nuclear Regulatory Commission,the loss of mass method for calculating the residual rigid response in the floor response spectrum analysis is introduced in this paper.The influence consideringthe residual rigid response on the floor response spectrum are analyzed by an example,and the necessity of considering the residual rigid response associated with loss of mass was verified.
作者
吕锦权
白明鑫
丁志新
LYU Jinquan;BAI Mingxin;DING Zhixin(State Key Laboratory of Nuclear Power Safety Monitoring Technology and Equipment,Shenzhen of Guangdong Prov.518026,China)
出处
《核科学与工程》
CAS
CSCD
北大核心
2023年第6期1387-1393,共7页
Nuclear Science and Engineering
关键词
核岛厂房
地震楼层反应谱分析
残余刚性反应
丢失质量法
Nuclear power plant structures
Seismic floor response spectrum
Residual rigid response
Loss of mass method
