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三塔双主跨悬索桥动力特性精细化分析

, PP. 70-76

Keywords: 桥梁工程,悬索桥,数值分析,动力特性,频率,模态

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Abstract:

?为深入了解双主跨悬索桥的动力特性,建立该桥型与单主跨悬索桥在动力特性上的定性或量化关系,以马鞍山大桥为工程背景和结构原型,分别构造出1座同跨径和1座双倍跨径的单主跨悬索桥,在主要振型、自振频率、等效质量、等效质量惯性矩、模态相似性、模态密集性和构件对刚度的贡献等方面进行了精细化对比分析。研究结果表明:双主跨悬索桥的自振频率总体上介于同跨径和双倍跨径的单主跨悬索桥之间;对于双主跨悬索桥的所有一阶模态和单主跨悬索桥的对称模态,可采用直接叠加法方便地估算等效质量和质量惯性矩;双主跨悬索桥的模态密集性比单主跨悬索桥大;双主跨悬索桥弯扭模态在全桥和单跨具有很好的相似性;单主跨悬索桥的桥塔对竖弯和扭转刚度的贡献很小,而双主跨悬索桥的桥塔(中塔)对竖弯刚度和扭转刚度贡献较大。

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