【作者】 石华；

【导师】 李嘉；

【作者基本信息】 湖南大学 ， 交通运输工程， 2013， 硕士

【摘要】 无缝桥梁接线路面采用连续配筋混凝土路面或连续配筋混凝土与沥青混凝土复合式路面结构形式，利用连续配筋混凝土路面容许带缝工作的特性，进一步取消了路桥伸缩缝。接线路面通过路面板中横向裂缝的张开来吸纳梁体的温降变形，在设计时需控制路面产生的裂缝宽度及间距，使其在设计规范容许范围内。此方案将主桥、搭板和路面联接成整体，实现了无缝桥梁的“全无缝化”。接线路面受力情况复杂，除了受到行车、温度等荷载作用外，还会受到无缝桥梁温缩变形产生的影响。本文以接线路面为研究对象，针对其结构特点结合现有研究成果，运用有限元法对接线路面的受力情况进行了研究，主要做了如下研究工作：（1）介绍了目前国内外CRC及CRC+AC复合式路面的发展和研究概况，对已有的关于全无缝桥梁结构体系的研究成果进行了总结；（2）建立了带地梁的无缝桥梁接线路面的三维有限元模型，对接线路面结构在温降效应的受力性能进行了分析，确定了主梁温度变形是CRC层钢筋应力最主要影响因素。研究了厚度、模量和配筋率等因素变化下，接线路面CRC层钢筋应力及板底应力的变化规律；（3）确定了在主梁温度变形、车辆荷载和温度荷载综合作用下，车辆荷载骑缝对称布置于第一条预锯缝处为接线路面的最不利荷位。研究路面结构参数如AC层的厚度及模量、CRC层模量与厚度及纵向配筋率变化时，对接线路面CRC层钢筋应力及板底应力的影响规律；（4）对接线路面承载性能进行了分析，研究了在车辆荷载及温度荷载作用下，接线路面板底应力对于路面结构参数的敏感性，提出了接线路面结构CRC层厚度设计方法。该设计方法结合了连续配筋混凝土的设计方法，也考虑了接线路面自身的受力特点。研究成果为接线路面的合理设计提供了理论依据。更多还原

【Abstract】 The approach pavement of jointless bridge uses CRC or CRC+AC composite pavement structure. With the characteristics of continuously reinforced concrete pavement allow jointless work, so the jointless bridge further cancels the expansion joints of the road and bridge. By the transverse cracks open, the approach pavement absorbs the deformation of the beam caused by temperature drop. The design of approach pavement should control crack width and spacing in the design specification range. The bridge, approach slab and approach pavement will be integrated into a whole in this design, which can realize jointless.The stress state of approach pavement is very complicated, and approach pavement is affected by not only vehicle load and temperature load, but also the shrinkage deformation of jointless bridges influenced by the temperature. This paper focus on the structure characteristics combining with the existing research results and takes the approach pavement for the research object. The finite element method was applied to study the stress condition. The main research works are done as follow:(1) Introducing the current CRC and CRC+AC composite pavement research situation at home and abroad, summarizing the research results of the total jointless bridge structural system.(2) Approach pavement with transverse trench lugs finite element models is established. This paper analyzes the mechanical performance of approach pavements under the effect of temperature drop effect and leads to the conclusion that the distortion of the main beam is the main influencing factors of CRC layer stress of reinforcement. The change rule of stress of reinforcement and slab stress are analyzed under thickness, variable modulus and steel ratio.(3) This paper proves that the first pre-cut crack symmetrically arranged is the critical load position of the approach pavement under the effect of the contraction distortion of the main beam, vehicle load and temperature load. The influence rule of stress of reinforcement and slab stress are analyzed with the change of pavement structure parameters such as the thickness and modulus of AC layer, the thickness and modulus of CRC layer and longitudinal steel ratio.(4) This paper analyzed the bearing capacity performance of approach pavement. Under the effect of vehicle load and temperature load, this paper studied the sensitivity of the slab stress of approach pavement with the change of pavement structure parameters. And this paper put forward the thickness design method of the CRC layer of approach pavement. The design method combines the design method of continuously reinforced concrete with the mechanical characteristics of approach pavement itself. The results offered a theoretical basis of structural design of approach pavement.更多还原