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Seismic response predictions of multi-span steel bridges through pushover analysis

机译：基于推覆分析的多跨钢桥地震响应预测

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In the new trend of seismic design methodology, the static pushover analysis is recommended for simple or regular structures whilst the time-history analysis is recommended for complex structures. To this end, the applicable range of the pushover analysis has to be clarified. This study aims at investigating the applicability of pushover analysis to multi-span continuous bridge systems with thin-walled steel piers. The focus is concentrated on the response demand predictions in longitudinal or transverse directions. The pushover analysis procedure for such structures is firstly summarized and then parametric studies are carried out on bridges with different types of superstructure-pier bearing connections. The considered parameters, such as piers' stiffness distribution and pier-deck stiffness ratio, are varied to cover both regular and irregular structures. Finally, the relation of the applicability of pushover analysis to different structural formats is demonstrated and a criterion based on the higher modal contribution is proposed to quantitatively specify the applicable range.
机译：在地震设计方法的新趋势中，建议将静力推覆分析用于简单或规则结构，而将时程分析建议用于复杂结构。为此，必须阐明下推分析的适用范围。这项研究旨在调查推覆分析在具有薄壁钢墩的多跨连续桥梁系统中的适用性。重点集中在纵向或横向的响应需求预测上。首先总结了此类结构的推覆分析程序，然后对具有不同类型的上层结构-承重连接的桥梁进行了参数研究。考虑到的参数（例如墩的刚度分布和墩-甲板刚度比）会变化，以覆盖规则和不规则结构。最后，论证了推覆分析适用性与不同结构形式之间的关系，并提出了一种基于较高模态贡献的准则来定量确定适用范围。

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