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大跨度钢桁梁斜拉桥拉索抖振疲劳损伤分析

DOI: 10.3969/j.issn.1674-0696.2013.sup.1.06, PP. 752-755

Keywords: 钢桁梁斜拉桥,斜拉索,风场,抖振响应,疲劳损伤,steeltrusscable-stayedbridge,stayedcable,windfield,buffeting-inducedresponse,fatiguedamage

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Abstract:

:?以南广铁路郁江钢桁梁斜拉桥为例,基于有限元软件ANSYS,提出一种考虑拉索的几何非线性的抖振疲劳分析方法。该方法首先采用谐波合成法模拟大桥的脉动风场;然后计算大桥典型拉索的抖振时程响应;再根据钢丝的S-N曲线及Miner准则估算了斜拉索的疲劳损伤。研究表明:斜拉索的抖振疲劳损伤非常小,风速较风偏角对拉索的应力及疲劳损伤影响大。

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