地震动传播至结构场地时具有空间相关性和相干性，考虑地震动空间相关性和相干性的多点输入比一致输入更符合实际。空间网格结构因其重量轻易于建造等优点获得了广泛应用，并且跨度不断增加。空间相干性对结构地震反应的影响已有研究，但空间相关性和相干性对大跨空间网格结构地震反应的影响还没有系统研究过。为此，申请者拟对大跨空间网格结构的地震动空间效应展开深入系统的研究，主要内容包括：（1）研究实际地震动场特性，模拟三维空间相干相关地震动记录；（2）通过数值模拟和理论分析等手段对大跨空间网格结构地震动空间效应展开研究，探索地震动空间相干性和相关性对结构的影响程度和机理；（3）提出合理高效的三维空间相干相关激励下大跨空间网格结构的抗震设计方法。通过本项目的研究建立起可应用于工程实践的大跨空间网格结构抗震理论，为大跨空间网格结构的发展提供理论基础和技术保障。

Seismic ground motions at a structural site are spatially correlated and coherent. It is more realistic to consider that the ground motions at multiple supports of a structure are spatially correlated and coherent than to assume that they are spatially uniform. The large-span space latticed structures has often used because of its light weight and relative ease to construct. The span of space latticed structures has increaseds gradually in recent years. The influence of the coherency on the seismic responses of structure has been investigated but the effect of the spatial correlation and coherency on the responses for the large-span space latticed structures has not been systematically investigated. As a matter of fast, on the basis of previous studies, the effects of spatial seismic excitations on large-span space latticed structures are investigated in detail. The main content of this study includes: (1) study characteristics of actual seismic ground motion, simulation of three-dimensional spatially correlated and coherent multiple-support excitations. (2) the seismic response of large-span space latticed structures under uniform and spatially correlated and coherent three-directional excitations will be investigated through the theoretical and numerical study, influence of spatially correlated and coherent on seismic response of large-span space latticed structures is studied. (3)The reasonable and effective seismic design method of large-span space latticed structures to consider the spatial variation effects by multi-support excitations will be developed. Through these studies, the useful seismic design method will be established to solve the actual engineering design problems, which will provide the reliable theoretical foundation and technical support for the engineering applications of the large-span space latticed structures.