【摘要】 地震动的空间变化可能引起结构物特殊的地震响应,因此大尺寸结构物或核电站厂房等重要构筑物的抗震分析中应考虑地震动的空间变化。以国内某核电站反应堆厂房为例,分别进行考虑地震动非相干效应和不考虑该效应的结构抗震分析,并选取主要标高处地震响应谱进行对比,研究5种地基条件下地震动非相干效应对结构响应的影响。研究结果表明,非相干效应对结构水平向和竖向地震响应均有显著影响,表现为考虑非相干效应后,结构水平向和竖向地震响应在高频区域均明显降低;在较软地基条件下,非相干效应对结构高标高处水平地震响应的影响程度大于低标高处,对竖向响应的影响则随着标高增加而减小;在高频区域,考虑地震动非相干效应后,结构水平向和竖向响应的降幅随着地基刚度增加而增加。更多还原

【Abstract】 The seismic analysis for large-dimensional structures or important structures like nuclear power plant buildings should consider the spatial variation of the input ground motion.Taking the reactor building of a nuclear power plant as example,the seismic analysis with or without considering the incoherence effect of seismic motion respectively were performed in this paper under five site conditions.In the analysis,the floor response spectra of two key elevations in the building were chosen for studying the effect of incoherency on structural seismic response.The results show that incoherence effect has a significant effect on both horizontal and vertical responses.Due to the seismic motion incoherency,both the horizontal and vertical responses in high frequency region decrease.For softer foundation,the effect of incoherency on the horizontal response at higher elevation is larger than that at lower elevation,and the effect of incoherency on the vertical response decreases with the increase of elevation.Considering the incoherence effect in analysis,the decreasing amplitude of the seismic response in high frequency region becomes larger as the foundation stiffness increases.更多还原