【作者】 王勇；

【导师】 李国芬；

【作者基本信息】 南京林业大学 ， 道路与铁道工程， 2014， 硕士

【摘要】 桥面铺装作为桥梁行车体系的重要组成部分，因较一般路面使用要求高，使用条件苛刻而日益受到研究人员重视。钢桥面铺装的车辙是一种永久变形，是铺装层主要病害之一。为得到大跨度复合浇注式沥青混凝土钢桥面铺装车辙发展规律，本文在分析了车辙形成机理和发展规律的基础上，采用了修正Burgers模型模拟铺装层的粘弹塑性，通过单轴蠕变试验回归沥青铺装层的材料参数，利用有限元软件建立模型，分析了各因素对车辙的影响并预估了车辙深度。首先，搜集了国内外大跨度钢箱梁桥车辙现场调查资料，结合南京长江四桥浇注式沥青混凝土+高弹改性沥青混凝土的铺装形式，选用单轴蠕变试验确定了预估模型中的材料参数。然后，针对上述铺装结构，利用ABAQUS有限元软件建立钢桥面铺装局部梁段模型，考虑了荷位、超载、铺装厚度组合形式和环境温度等影响因素，计算并分析了车辙深度随各因素的变化情况。最后，用有限元模型预估了2013年南京长江第四大桥最大总车辙量为13.4mm，与实测值误差为5.51%。研究表明，对于浇注式沥青混凝土+高弹改性沥青铺装结构，车辙主要发生在浇注式沥青混凝土层，该层车辙深度占总车辙深度的63%。车辙深度随铺装层厚度增加而迅速增大；随轴载加大而增大；随荷位的变化尤其是横向荷位变化而有一定改变。车辙病害总体上随着环境温度升高而增大，但两者呈现出突变的非线性关系。本研究对于同种类型沥青钢桥面的抗车辙设计、车辙预估、寿命预测具有一定指导意义。更多还原

【Abstract】 As one of the most important part of bridge crane system,bridge deck pavementis highly regarded by the researchers for higher requirement than general pavementand more harsh conditions of use. The steel bridge deck pavement rutting is apermanent deformation and also one of the main diseases of pavement layer. In orderto get the rules of rutting of Long-span steel bridge deck compound Gussasphaltpavement,these steps are used: Firstly,rutting formation mechanism anddevelopment rules is analyzed.Secondly, the modified Burgers model is used tosimulate viscoelastic plasticity of pavement.Thirdly, The material parameters ofasphalt pavement is regressed through uniaxial creep test.Fourthly, a model isestablished through finite element software to predict rutting depth.Finally, therutting depth is predicted and the influence of various factors on rutting is analyzed.First of all, the domestic and foreign large span steel box girder bridgepavement rut spot survey data is collected. The uniaxial creep test is used todetermine the material parameters in the prediction model combine with thepavement forms of Gussasphalt+high elastic modified asphalt on Nanjing fourthYangtze River Bridge.Then, in the light of the pavement structure above,a steel bridge deck pavementlocal beam segment model is established through a finite element software calledABAQUS.The changes of rut depth with the factors as follow: load position,overload,pavement thickness combinations and environment temperature.Finally, combine with the accumulative equivalent axle, the maximum totalrutting amount of Nanjing fourth Yangtze River Bridge is estimated as13.4mmthrough the finite element model has been established,and the measured value erroris5.51%.The researches show that, for Gussasphalt+high elastic modified asphaltconcrete structure, The rut mainly occures in the Gussasphal concrete layer, reaching63%of the total.The rut increases rapidly with the increase of the thickness ofpavement layer.It also increses along with the increase of axial load.And it increasesalong with the change of load position; especially the transverse load change. Thestudy is of great significance in the design of anti rutting, rutting predition and lifeprediction for the same type of steel bridge deck pavement.更多还原