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地震传播至结构场地时会存在空间上的变化,考虑地震空间变化性的多点输入比一致输入更符合实际.为研究地震空间变化性对单层球壳反应的影响,以行波效应为例建立地震动场,对单层球面网壳结构进行了地震多点输入与一致输入时程响应分析,分析了地震视波速、PGA和结构跨度三个因素对单层球面网壳结构地震空间相关性效应的影响程度.系统分析结果表明:地震空间变化性对结构的影响程度与结构和地震两方面因素密切相关,是否考虑地震空间变化性须由这两方面因素综合确定,当地震动场视波速较小、PGA较大时,较大跨度结构受地震空间变化性影响较大.
When the earthquake propagates to the structural field, there will be spatial changes, and it is more realistic to consider multi-point input of the spatial variability of the earthquake than consistent input.In order to study the influence of spatial variability of the earthquake on the single-layer spherical shell reaction, taking the traveling wave effect as an example The establishment of ground motion field, multi-layer single-layer reticular shell structure input and consistent input time-history analysis of seismic response analysis of seismic velocity, PGA and structural span of three single-layer spherical reticulated shell structure of the spatial correlation The degree of influence of the earthquake.The results of the system analysis show that the degree of influence of the spatial variability of the earthquake on the structure is closely related to the structure and the factors of the earthquake. Whether the spatial variability of the earthquake is taken into account should be determined synthetically by the two factors. Small, larger PGA, the larger span structure is more affected by the spatial variability of the earthquake.