全无缝化桥梁接线路面温度效应与锚固地梁研究

发布时间：2018-04-06 01:24

本文选题：无缝桥梁　切入点：接线路面　出处：《湖南大学》2015年硕士论文

【摘要】：桥梁伸缩装置容易受到结构集中变形、外部环境侵蚀和汽车荷载的反复冲击作用,成为桥梁结构中最易遭到破坏的部位。伸缩缝损坏引起的桥头跳车、长期维修、定期更换的问题,一直受到是国内外公路桥梁建设者的关注。为解决伸缩缝易损难维护的问题,在量大面广的中小桥中,采用新型全无缝桥梁结构设计,即完全取消桥面伸缩缝装置,将主梁、搭板、接线路面以及锚固结构整体联接。在环境温度循环作用下,桥梁的变形主要依靠接线路面来吸纳和末端锚固地梁加以限制。本文主要以全无缝化桥梁配筋接线路面为研究对象,在理论分析的基础上,提出新的优化配筋方式和锚固地梁设计内容,并结合试验桥的实测数据验证理论分析。主要研究内容如下:(1)通过分析接线路面板温度作用下应力、变形的特点,在现有的路面配筋设计的基础上加以改进,提出一种新的配筋方式,即分段配筋设计。变配筋设计将充分发挥钢筋的受拉作用,更有利于路面裂缝的开展以吸纳桥梁变形。建立了温升状况下接线路面板的力学计算模型,推导了接线路面的应力与位移解析解。(2)开展了无缝化桥梁接线路面设计参数敏感性分析,进一步得到了接线路面长度预估模型与接线路面板应力预估模型。(3)锚固结构用来约束温度变化引起的接线路面端部位移。选择合适锚固端的类型、分析锚固端的受力机理,引入矩阵位移法得到地梁位移与端部力大小的关系;分析锚固端设计参数影响因素,得到了地梁的设计方法。(4)提出了接线路面长度及分段配筋设计、锚固地梁设计方法。采用VB语言编制程序,实现了接线路面长度及配筋设计,锚固地梁设计的自动化计算。与依托试验桥的实测数据对比,解析法计算与实桥监测数据较为接近,验证了理论推导结果的可行性。
[Abstract]:Bridge expansion devices are easily subjected to concentrated deformation of the structure, external environmental erosion and repeated impact of vehicle loads, which are the most vulnerable parts of the bridge structure.The problems of bridge head jump, long-term maintenance and regular replacement caused by damage of expansion joint have always been concerned by highway and bridge builders at home and abroad.In order to solve the problem that the expansion joint is easy to be damaged and difficult to maintain, a new type of fully seamless bridge structure design is adopted in the middle and small bridge with a wide range of quantities, that is, the bridge deck expansion joint device is completely eliminated, and the main beam, slabs, connection pavement and anchoring structure are connected as a whole.Under the action of ambient temperature cycle, the deformation of bridge is mainly limited by connecting road to absorb and anchoring the ground beam at the end.Based on the theoretical analysis, a new optimized reinforcement method and the design content of anchoring ground beam are put forward in this paper, and the theoretical analysis is combined with the measured data of the experimental bridge.The main research contents are as follows: (1) by analyzing the characteristics of stress and deformation under the action of the temperature of the connecting line panel and improving the existing pavement reinforcement design, a new reinforcement method, namely, the segmented reinforcement design, is put forward.The variable reinforcement design will give full play to the tensile action of steel bar, which is more conducive to the development of pavement cracks to absorb the bridge deformation.In this paper, the mechanical calculation model of the connection line panel under the condition of temperature rise is established, and the analytical solution of stress and displacement of the connecting road surface is derived. (2) the sensitivity analysis of the design parameters of the jointless bridge connection pavement is carried out.Furthermore, the prediction model of the length of the connection pavement and the stress prediction model of the connecting line panel are obtained. The Anchorage structure is used to restrain the end displacement of the connection pavement caused by the change of temperature.Choosing the appropriate type of anchoring end, analyzing the stress mechanism of anchoring end, introducing matrix displacement method to obtain the relationship between the displacement of the ground beam and the end force, analyzing the influencing factors of the design parameters of the anchor end,The design method of ground beam is obtained. (4) the design method of connecting road surface length, section reinforcement and anchoring ground beam is put forward.The automatic calculation of the length of connection pavement, reinforcement design and Anchorage beam design are realized by using VB language.Compared with the measured data of the experimental bridge, the analytical method and the real bridge monitoring data are close to each other, which verifies the feasibility of the theoretical derivation.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U443.31

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