【作者】 苏茂材；

【导师】 李永乐；

【作者基本信息】 西南交通大学 ， 桥梁与隧道工程， 2011， 硕士

【摘要】 正交异性整体钢桥面板与桁架组合体系桥梁具有刚度大、整体性好、动力性能好、噪声小等优点,是高速铁路大跨度钢桥较为合适的结构形式之一。本文针对大跨度铁路板桁斜拉桥,对其实用建模方法及结构刚度展开研究。首先对板桁斜拉桥的发展历史做了系统的回顾,概括了板桁组合体系的结构形式及力学特点,总结了计算分析方法的研究现状。其次基于有限元分析方法,详细介绍了板桁斜拉桥的建模方法,建立了该桥的全桥空间有限元模型,并基于此模型对该桥受力行为展开分析。然后,对板壳单元模型进行了动力特性分析,提出了大跨度板桁斜拉桥的实用简化模型,并从整体受力、桥面系受力及结构动力特性等方面对其进行了评价。最后,针对桁宽、桁高、桥面系、斜拉索、辅助墩、道砟板等主要参数,分别从结构动力特性、车桥系统响应等方面来探讨各参数对桥梁的静动力影响,同时调研了国内外已有斜拉桥的刚度参数取值实例,并对部分刚度参数作了总结。更多还原

【Abstract】 Truss with orthotropic steel bridge deck is one of the relatively reasonable structural types for long-span bridges of high-speed railways, due to its great rigidty, good integrity, excellent dynamic behavior, making low noise, etc.Firstly, the thesis reviews the development of rail-road steel truss bridge systematically and summarizes the structural and the mechanical properties of plate-truss composite. Also the research status of calculation method was summarized.Secondly, on the basis of finite element method, the thesis introduces the modeling method for plate-truss cable-stayed bridges, and establishs spacial finite element model, and then The analysis is made in detail for mechanical behavior of this model.Then, the thesis makes a dynamic analysis for the plate-shell element model, and put forward a pratically simplified model, and evaluates this model from three aspects including overall stress, bridge floor system stress and dynamic property.Finally, according to these parameters such as beam width, beam depth, bridge floor system, cables, auxiliary pier and concrete slab, the thesis discusses the static and dynamic influence on the structural dynamic property and vehicles-bridge system response. At last, investigating the relevant examples about stiffness parameters value domestic and overseas, partial stiffness parameters are summarizd.更多还原