中文摘要：

在这篇论文，地震地面运动的一个新空间连贯模型被一个恰当的过程建议。形式的联合(关联) 的分析表情结构的反应的系数为多支持被开发地震刺激。从数字集成和分析答案的系数与相比验证答案的精确性。数字形式的联合系数的分析表情精确性高，这被显示出。分析形式的联合系数在这篇论文开发了的例子桥表演的随机的回答的结果是足够精确的满足在实践需要的要求。另外，形式的联合系数的分析答案的计算效率被例子桥的反应计算表明。使用分析形式的联合系数为结构的反应分析要求的时间用数字不可分的方法是那的不到 1/20，这被发现。

英文摘要：

In this paper, a new spatial coherence model of seismic ground motions is proposed by a fitting procedure. The analytical expressions of modal combination （correlation） coefficients of structural response are developed for multi-support seismic excitations. The coefficients from both the numerical integration and analytical solutions are compared to verify the accuracy of the solutions. It is shown that the analytical expressions of numerical modal combination coefficients are of high accuracy. The results of random responses of an example bridge show that the analytical modal combination coefficients developed in this paper are accurate enough to meet the requirements needed in practice. In addition, the computational efficiency of the analytical solutions of the modal combination coefficients is demonstrated by the response computation of the example bridge. It is found that the time required for the structural response analysis by using the analytical modal combination coefficients is less than 1/20 of that using numerical integral methods.