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以某核电站工程为背景，建立了地基土－核电站辅助厂房结构相互作用体系的运动方程，并求出其频率响应函数．将随机临界地震响应分析法引入多自由度相互作用体系中，分析在单向地震输入下，体系的随机临界地震响应，并和相同能量（输入方差相同）单向地震输入下体系的随机地震响应相比较，从而对随机临界地震响应分析法的实用性作一定量评估．
Based on the background of a nuclear power plant project, the equation of motion of the structural interaction system of the auxiliary building of the foundation soil-nuclear power plant is established and its frequency response function is obtained. The random critical seismic response analysis method was introduced into the multi-degree-of-freedom interaction system to analyze the stochastic critical seismic response of the system under one-way seismic input, and with the same energy (the same input variance), the random seismic response of the system under one-way seismic input In comparison, a certain amount of evaluation is made on the practicality of the random critical seismic response analysis method.