地震作用下超大跨斜拉桥地震损伤与破坏模式研究

发布时间：2018-07-05 08:53

本文选题：超大跨斜拉桥 + 破坏模式　；参考：《地震工程与工程振动》2014年06期

【摘要】：本文以一座试设计的主跨1 400 m斜拉桥为例,采用弹塑性分析方法并以Park损伤指数作为评价指标,研究了斜拉桥典型结构体系顺桥向和横桥向的地震损伤与破坏模式;在此基础上,进一步研究了不同频率成分地震动对其地震损伤与破坏模式的影响。结果表明:地震作用下主塔和桥墩属于易损构件,需重点关注;主塔顺桥向、桥墩顺桥向和横桥向发生典型的单塑性铰破坏模式,而主塔横桥向则发生双塑性铰破坏模式;主塔和桥墩的地震损伤受输入地震频率成分的影响非常显著,且低频成分越丰富,其地震损伤越严重,但不会改变其破坏模式。
[Abstract]:Taking an example of a main span 1400 m cable-stayed bridge designed by a trial, this paper uses the elastoplastic analysis method and takes the Park damage index as the evaluation index, and studies the seismic damage and failure modes of the CIS bridge direction and the transverse bridge direction of the typical structural system of the cable-stayed bridge, and on this basis further studies the seismic damage and breaking of different frequency components to the earthquake. The results show that the main tower and pier under earthquake are vulnerable components, and it is necessary to focus attention on the failure mode of the main tower along the bridge direction, the pier bridge direction and the transverse bridge, and the double plastic hinge failure mode of the main tower's transverse bridge direction; the earthquake damage of the main tower and the pier is influenced by the input seismic frequency components. Very significant, and the more abundant low-frequency components, the more serious seismic damage, but will not change its failure mode.
【作者单位】：宁波大学建筑工程与环境学院;同济大学土木工程防灾国家重点实验室;
【基金】：国家自然科学基金项目(91315301) 宁波大学人才工程项目(ZX2014000207)
【分类号】：U442.55;U448.27

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