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首页> 外文期刊>International journal of steel structures >A mode contribution ratio method for seismic analysis of large-span spatial structures
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A mode contribution ratio method for seismic analysis of large-span spatial structures

机译:大跨度空间结构地震分析的模式贡献率法

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摘要

The structural forms of large-span spatial structures can be characterized by the dense distribution of their natural frequencies, and their vibration subjected to seismic loads is three-dimensional. There are many modes that contribute to the seismic response. The high-order modes typically dominate. The mode superposition dynamic analysis method used for seismic design of spatial structures requires a criterion to determine the dominant modes. The criterion for tall buildings is not applicable for spatial structures; instead, we have proposed the mode contribution ratio method for the selection of the dominant modes of spatial structures subjected to seismic loads. A set of 18 typical cases of different single-layer spherical lattice shells was used to verify the validity of this method. The following conclusions can be drawn: First, the method for combining the first thirty modes to calculate the seismic responses specified in the Technical Specification for Space Frame Structures is not accurate and is not applicable to spatial structures. Second, the mode contribution ratio method can be used to choose the dominant modes of spatial structures. Third, the mode contribution ratio is physically different from the effective mass ratio. Especially when the structural mass distribution is uneven, the two ratios are different, and the mode contribution ratio is more precise in calculation of the seismic responses of spatial structures.
机译:大跨度空间结构的结构形式可以通过其固有频率的密集分布来表征,其承受地震载荷的振动是三维的。有多种模式可引起地震响应。高阶模式通常占主导地位。用于空间结构抗震设计的模式叠加动力分析方法需要确定主导模式的准则。高层建筑的标准不适用于空间结构;取而代之的是,我们提出了模式贡献率法来选择地震荷载作用下的空间结构的主导模态。一组18个不同的单层球形格子壳的典型案例用于验证该方法的有效性。可以得出以下结论:首先,结合前三十种模式来计算空间框架结构技术规范中指定的地震响应的方法不准确,并且不适用于空间结构。其次,可以使用模式贡献率法来选择空间结构的主导模式。第三,模式贡献率在物理上不同于有效质量比。特别是当结构质量分布不均匀时,这两个比率是不同的,并且在计算空间结构的地震响应时,模式贡献率更加精确。

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