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选取AP1000核岛结构标准设计地基的5种场地参数,开展了场地非线性地震反应的计算分析。计算分析中,以不同的地震动输入界面作为计算基底,并分别以不同持时的人工地震动加速度时程作为输入地震动。计算结果显示:对于硬岩和软岩场地,计算基底输入地震动持时对场地地表峰值加速度和加速度反应谱的影响可忽略不计;对于土层场地,长持时输入地震动的场地地表峰值加速度和高频段的(约大于10 Hz)加速度反应谱明显大于短持时的计算结果,考虑到地震动持时也可能对非基岩核电厂抗震设防产生一定影响,进一步开展研究十分必要。
Five kinds of site parameters of AP1000 nuclear island structure standard design ground were selected to carry out the calculation and analysis of the nonlinear seismic response of the site. In the calculation and analysis, different ground motion input interfaces are used as the calculation basement, and ground motion with different durations of artificial ground motion acceleration time respectively is taken as input ground motion. The calculated results show that for the hard rock and soft rock sites, the influence of input ground motions on the ground surface peak acceleration and acceleration response spectrum can be neglected. For the site of the soil layer, the surface peak ground acceleration And high-frequency (> 10 Hz) acceleration response spectra are obviously larger than those of short-term holding. Considering that the timing of ground motion may also affect the seismic fortification of non-base rock nuclear power plant, further research is necessary.