利用功率谱与反应谱的转换关系，建立了均匀调制过程输入功率谱密度函数表达式，提出了分析土与结构相互作用体系均匀调制过程的反应谱分析方法。该方法利用新规范中的加速度反应谱作为目标谱，计算与之相对的功率谱并按该功率谱作为地震输入谱进行土与结构相互作用体系随机地震反应分析，研究表明该方法反映了地震动和相互作用体系的动力特性，是进行土与结构相互作用体系随机地震反应分析的一种有效方法。

Based on the relationship between power spectral density function and response spectrum, an expression describing an uniform modulation process input power spectral density function was established. The response spectrum method for the uniform modulation process was proposed for non － stationary response of soil － structure system under seismic excitation. The new code acceleration response spectrum was used as the object spectrum, corresponding power spectral density function used as inputspectral density function and the random seismic response of soil － structure interaction system was analyzed. The research result showed that the proposed method can describe the dynamic characteristics of earthquake motions and interaction system, and is an effective approach for soil － structure interaction system analysis. 