为寻求大跨度结构分析所需的合理地震动输入，给出了一种基于已知地震记录的多点地震动合成法，该方法使用AR模型估计谱函数，利用多元线性预测对未知输入点地震动进行预测，通过高斯随机抽样来反应地震动的随机因素，并采用分窗叠加的办法反应时变特性。通过比较合成地震动与该处真实地震记录说明了该合成方法具有准确性和合理性，可以为大跨度结构抗震计算提供参考。

A record based approach has been developed for the simulation of spatially correlated ground motion. This procedure uses autoregressive model to establish a power spectrum, and uses the multivariate linear prediction to simulate the parameter of unknown position. The random factor of earthquake is relected by Gaussian distribution random number, and the known records are subdivided into a sequence of time windows to account for its temporal variation. Compare of the simulated record and the true record show that this procedure is accurate and reasonable, and it is applicable for the design of discretely supported systems.

国家自然科学基金资助项目（90815011）；教育部新世纪人才计划资助项目（06-0765）