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CFRP索的风致瞬态动力响应数值模拟与试验

, PP. 54-61

Keywords: 桥梁工程,CFRP索,动力响应,流固耦合,风场,瞬态分析

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Abstract:

?为了对CFRP索在强风作用下的瞬态动力响应进行研究,以50m长CFRP索及其所在风场为耦合模型,采用流固耦合数值方法,分析了多种工况下CFRP索与钢索的风致瞬态响应和风场参数;通过两者响应结果的对比分析获得了CFRP拉索不同于钢索的风致响应特征,并基于现场实桥测试对模拟结果进行了验证。结果表明:在强风作用下,CFRP索与钢索的瞬态响应均较为强烈,跨中节点位移和最大应力均较大;钢索的节点位移时程曲线和应力时程曲线均呈现较显著的非线性,而CFRP索的响应曲线接近线性;斜拉索的倾角对周围流场有重要影响,且同等条件下CFRP索与钢索周围流场不一致,说明风与索之间具有不可忽视的耦合作用。

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