三塔双主跨悬索桥动力特性精细化分析

发布时间：2018-02-04 09:49

本文关键词： 桥梁工程悬索桥数值分析动力特性频率模态　出处：《中国公路学报》2014年02期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:In order to deeply understand the dynamic characteristics of the two-span suspension bridge, the qualitative or quantitative relationship between the bridge type and the single-span suspension bridge is established. The Ma'anshan Bridge is taken as the engineering background and the structure prototype. A single main span suspension bridge with the same span and a double span is constructed, which is similar in the main mode, natural frequency, equivalent mass, equivalent mass moment of inertia and modal similarity. The modal density and the contribution of members to stiffness are compared and analyzed in detail. The results show that the natural vibration frequency of double span suspension bridge is between the same span and double span single main span suspension bridge. For all the first-order modes of the two-main-span suspension bridge and the symmetrical mode of the single-main-span suspension bridge, the direct superposition method can be used to estimate the equivalent mass and the mass moment of inertia conveniently. The modal density of double main span suspension bridge is greater than that of single main span suspension bridge. The bending and torsional modes of double main span suspension bridge are similar to that of single span bridge. The tower of single main span suspension bridge has little contribution to vertical bending and torsional stiffness, while the tower (middle tower) of double main span suspension bridge has great contribution to vertical bending stiffness and torsional stiffness.
【作者单位】：东南大学混凝土及预应力混凝土结构教育部重点实验室;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(51208104,50908046) 江苏省自然科学基金项目(BK2012344) 教育部高等学校博士学科点专项科研基金项目(20120092120018) 江苏省高校优势学科建设工程项目(PAPD)
【分类号】：U448.25
【正文快照】： 0引言多主跨悬索桥作为一种新兴桥型已崭露头角,中国已揭开了建设大跨度多主跨悬索桥的序幕,而且多主跨悬索桥凭借其良好的经济性和巨大的跨越能力在世界范围内的跨海连岛工程中有着广阔应用前景[1-2]。动力特性是抗风、抗震、车桥耦合振动等动力分析和振动控制的基础。关于

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