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地震作用下超大跨斜拉桥地震损伤与破坏模式研究

DOI: 10.13197/j.eeev.2014.06.127.xiew.017, PP. 127-135

Keywords: 超大跨斜拉桥,破坏模式,极端地震输入,地震损伤,地震损伤准则,纤维有限元模型

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Abstract:

本文以一座试设计的主跨1400m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.

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