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首页> 外文期刊>Earthquake Engineering & Structural Dynamics >Modal-based ground motion selection procedure for nonlinear response time history analysis of high-rise buildings
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Modal-based ground motion selection procedure for nonlinear response time history analysis of high-rise buildings

机译：基于模态的地震动选择程序用于高层建筑非线性响应时程分析

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摘要

The selection of representative input ground motions (IGMs) is important for a proper nonlinear response time history analysis (NLRHA) of modern structures. The prevailing IGM selection procedure requires that the response spectra of selected ground motions are matched with the code-specified design spectra, while the effect of the frequency contents combination in the time domain on the multimode interactions is not considered. Ignoring the effect of the frequency contents combination in the time domain of IGMs may cause significant variations in the analysis results for selected IGMs, although they are matched to the same design spectrum. In this paper, a modal-based ground motion selection (MGMS) procedure is proposed as a supplement to spectrum matching-based IGM selection procedures for selecting proper IGMs that can sufficiently induce the multimode interactions. In the proposed procedure, three equivalent single-degree-of-freedom (ESDOF) systems are developed by pushover analysis. NLRHA is then conducted for these ESDOF systems with a set of 20 seed IGMs chosen by the spectrum-matching-based selection procedure. Finally, seven IGMs are selected from the seed IGMs for NLRHA in the full structural model. To verify MGMS, seismic demands of high-rise buildings were computed by NLRHA with seven MGMS-selected IGMs, seven IGMs with closest spectrum matching, and groups of seven randomly selected IGMs derived from three different sets of 20 seed IGMs. The computed seismic demands with MGMS-IGMs show very good agreement with the mean demands determined using the whole set of seed IGMs, while the deviation is much lesser compared with those groups of randomly selected IGMs.
机译：代表性输入地面运动（IGM）的选择对于现代结构的正确非线性响应时程分析（NLRHA）很重要。通用的IGM选择程序要求选定的地面运动的响应谱与代码指定的设计谱相匹配，而时域中的频率内容组合对多模相互作用的影响则不予考虑。忽略IGM时域中频率内容组合的影响可能会导致所选IGM的分析结果发生重大变化，尽管它们与相同的设计频谱匹配。在本文中，提出了一种基于模式的地面运动选择（MGMS）程序，作为基于频谱匹配的IGM选择程序的补充，用于选择可以充分诱发多模相互作用的适当IGM。在提出的程序中，通过推覆分析开发了三个等效的单自由度（ESDOF）系统。然后，针对这些ESDOF系统使用一组20个种子IGM进行NLRHA，这些IGM由基于频谱匹配的选择程序选择。最后，在完整结构模型中，从种子IGM中为NLRHA选择了七个IGM。为了验证MGMS，NLRHA用7个MGMS选择的IGM，7个具有最接近光谱匹配的IGM，以及7个从20个种子IGM的不同集合中随机选择的IGM组成的组，计算了高层建筑的地震需求。用MGMS-IGM计算的地震需求与使用整套种子IGM确定的平均需求非常吻合，而与那些随机选择的IGM组相比，偏差要小得多。

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