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选择合适的地震动强度参数可减小其与结构响应相关分析结果的离散性。以Kiewitt-8型单层球面网壳结构为研究对象,对算例结构进行谐响应分析,确定结构三个方向的敏感频率;提出基于三向敏感频率的地震动强度参数加速度谱Sa,3d。采用有限元软件ABAQUS对算例结构进行三向地震动作用下的增量动力分析,并对分析结果进行统计分析,从相关性和有效性两个方面对Sa,3d进行评价。结果表明:Sa,3d与单层球面网壳结构的地震响应具有更好的相关性,且具有较好的有效性,建议对单层球面网壳结构,采用Sa,3d作为地震动强度参数进行增量动力分析。
Choosing a suitable ground motion intensity parameter can reduce the discreteness of the analytical results associated with the structural response. Taking the Kiewitt-8 type single-layer spherical lattice shell as the research object, the harmonic response analysis of the example structure was performed to determine the sensitive frequency of the three directions of the structure. The acceleration spectrum Sa, 3d of the ground motion intensity parameters based on the three-direction sensitive frequency was proposed. The finite element software ABAQUS was used to analyze the incremental structural dynamics under three-way ground motions. The analysis results were statistically analyzed, and Sa and 3d were evaluated from the aspects of correlation and validity. The results show that the seismic response of Sa, 3d and single-layer spherical reticulated shells has better correlation and good effectiveness. It is suggested that for single-layer spherical reticulated shell structures, Sa and 3d are used as the seismic intensity parameters. Incremental dynamic analysis.