对结构所受的地震作用既考虑了地面运动的非平稳性，又计及了行波效应及激励点之间相干性的部分损失，给出了计算结构响应时变功率谱的虚拟激励算法。该法不仅计及了振型间的耦合项及激励间的耦合项，而且简便高效。 The seismic effects on the structure take into account not only the non-stationarity of the ground motion, but also the traveling wave effect and the partial loss of the coherence between the excitation points. A virtual excitation algorithm for calculating the time-varying power spectrum of the structure response is given. This method not only takes into account the coupling terms between the mode shapes and the coupling terms between the excitations, but also is simple and efficient.