【作者】 罗剑；

【导师】 钱振东；

【作者基本信息】 东南大学 ， 道路与铁道工程， 2004， 硕士

【摘要】 桥面铺装是大跨径桥梁建设中的一个热点和难点。桥面铺装的工作条件较普通路面要严酷,在自然环境影响以及交通负荷作用下,铺装层易出现种种病害,这些病害将直接影响到行车的安全和桥梁耐久性。到目前为止,世界各国至今还没有形成一套成熟的桥面铺装结构形式和设计方法。因此,为了适应我国桥梁建设需要,从力学的角度对桥面铺装进行研究,寻求铺装层受力规律,为铺装层设计及进一步研究铺装层破坏提供理论基础,具有重要的理论意义和应用价值。论文采用整体到局部的层次分析法,研究大跨径混合桥梁整体变形对其桥面铺装层受力的影响,研究的主要问题和相关结论如下:第一,以主梁轴力作为铺装层破坏的控制指标,对大跨径斜拉桥进行二维整桥受力分析,得到车队荷载沿桥纵向最不利作用位置。通过研究发现,整桥温度变化对铺装层受力影响很小;第二,从大跨径斜拉桥三维模型出发,采用层次分析法,逐步逼近正交异性板模型,分析整桥变形对桥面铺装受力的影响,通过计算模拟和实桥测试发现,仅在竖向荷载作用下,整桥变形对铺装层受力影响很小,采用简化约束的正交异性板桥面模型可以反映桥面铺装实际工作状态;第三,利用正交异性板模型研究水平和竖直荷载综合作用下正交异性钢桥面板铺装层的受力规律发现:铺装层各项力学指标对水平荷载的敏感性有较大差别;最后,利用正交异性板模型对比研究不同荷载接地形式(单轮和双轮)对铺装层受力的影响,确定铺装层的横向最不利位置,通过研究发现当以铺装表面最大拉应力作为铺装破坏控制指标时,单轮荷载的计算结果大于双轮荷载,当以铺装最大剪应力作为设计指标时,双轮荷载的计算结果大于单轮荷载。更多还原

【Abstract】 Deck surfacing is a technical difficult point in the construction of long span steel bridges. The working conditions and requirements of the application of surfacing are far more stringent than these of ordinary road pavements. With the influence of natural environment and traffic load, it is easy for deck to be damaged. To recent, there have not a design method for common use. In order to get up with the fast development of long span bridges in China, making extensive study of the paving structures and do some researches about mechanics analysis will have important theoretical meaning and application value.Using the hierarchical analytical method, the paper makes the mechanics analysis of the pave. The main researches included the following aspects and got the correlative results:Firstly, using the axial force of the principal beam as the control index, the paper make the mechanics analysis of the two dimensions FEA model, least favorable positions was found. Thought the research we find that the influence of the temperature stress is little.Secondly, from integral to part, the influence of bridge deform was studied. Using the compute simulate and the practice testing, we find that orthotropic steel bridge deck can reflect the real working condition of bridge deckThirdly, using the orthotropic steel bridge deck model, regularity of pave under the horizontal and the vertical load was found.Finally, using the orthotropic steel bridge deck model, the difference influence of the single-wheel and double-wheel was studied and the least favorable positions was found. We think that single-wheel is safety when use the max tensile stress as the control index and should choose double-wheel when the shear destroy of deck be studied.更多还原