考虑SSI效应的核电站泵房结构楼层反应谱分析

FRS Analysis for Pumping Station Structure of NPP Considering SSI Effect

采用SuperSAP和CLASSI程序对某在建核电站泵房结构进行了极限安全地震震动和运行安全地震震动情况下的土壤-结构相互作用(SSI)的地震分析,揭示了结构在时域内的特性;通过傅立叶变换(FFT)分析了结构在频域内的特性,求得建筑结构中各楼层反应谱,结合核电厂设计规范分别给出了在较硬地基岩土条件下,结构考虑和不考虑SSI时各楼层反应谱,并对其进行了比较分析。结果表明,SSI效应对结构楼层反应谱的谱形、谱值以及零周期平台高度有一定的影响。

In this paper, a dynamic analysis for pumping station structure of NPP is carried out using Super SAP and CLASSI program under the condition of ultimate safety ground motion and operation safety ground motion .The series of seismic response were transformed by FFT （Fast Fourier Transform） after the time-history analysis and in turn the Floor Response Spectra （FRS） of structure is achieved .The calculation results under the two conditions are compared in detail. Based on the comparison made between the two results（considering SSI and fixed base） under-mentioned, it indicates that this method and program is practical. It also clearly shows there are significant effects of SSI on the FRS peak value, FRS shape and the response spectrum value in the high frequency domain.