大悬挑对核电厂转运-清洗间结构的地震反应影响

Effects of large cantilever on seismic response of transfer-cleaning room structure in nuclear power plant

以核电厂转运-清洗间结构为原型,建立无悬挑的转运-清洗间结构和带悬挑的转运-清洗间结构有限元模型。通过对两个模型展开模态分析和动力时程分析,分析大悬挑对转运-清洗间结构抗震性能的影响,探讨转运-清洗间结构的动力特征和抗震性能。结果表明:转运-清洗间的结构刚度大、自振周期短,在超设计基准地震动作用下的地震反应较小,结构整体仍处于弹性工作状态;大悬挑显著降低了转运-清洗间结构的刚度,延长结构的自振周期,同时结构也增大了整体地震反应,但这种增幅并不大,带悬挑的转运-清洗间完全满足抗震性能要求。

Here,taking transfer and cleaning room structure of nuclear power plant as a prototype,finite element models of transfer-cleaning room structures without and with cantilever,respectively were established.Through modal analysis and dynamic time history analysis of the two models,effects of large cantilever on aseismic performance of transfer-cleaning room structure were analyzed,and its dynamic characteristics and aseismic performance were explored.The results showed that because structural stiffness of transfer-cleaning room structure is large and its natural vibration period is short,its seismic response is smaller under action of ground motion exceeding the design basis,and the overall structure is still in elastic working state;large cantilever significantly reduces stiffness of transfer-cleaning room structure,prolongs its natural vibration period,and also increases the overall structure’s seismic response,but this increase is not large;transfer-cleaning room structure with cantilever fully satisfies aseismic performance requirements.