大跨度复合浇注式沥青混凝土钢桥面铺装车辙预估研究

发布时间：2018-05-27 01:07

本文选题：钢桥面铺装 + 车辙　；参考：《南京林业大学》2014年硕士论文

【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。
[Abstract]:As an important part of bridge driving system, bridge deck pavement is paid more attention to by researchers because of its higher requirement and harsh use conditions. Rutting of steel bridge deck pavement is a kind of permanent deformation and one of the main diseases of pavement. In order to get the rutting development law of large-span composite pouring asphalt concrete steel deck pavement, this paper analyzes the rutting formation mechanism and development law, and uses the modified Burgers model to simulate the viscoelastic plasticity of pavement. The material parameters of asphalt pavement were regressed by uniaxial creep test and the model was established by using finite element software. The influence of various factors on rutting was analyzed and the rut depth was estimated. First of all, the field investigation data of rutting of large-span steel box girder bridges at home and abroad are collected, combined with the paving form of high elastic modified asphalt concrete of pouring type asphalt concrete of Nanjing Yangtze River fourth Bridge. The material parameters in the prediction model were determined by uniaxial creep test. Then, the local beam segment model of steel bridge deck pavement is established by using ABAQUS finite element software, and the influence factors such as load position, overload, pavement thickness combination form and environment temperature are considered. The variation of rutting depth with various factors is calculated and analyzed. Finally, the maximum total rutting capacity of Nanjing Yangtze River fourth Bridge in 2013 is estimated by finite element model to be 13.4 mm, and the error from the measured value is 5.51 mm. The results show that rutting occurs mainly in the pouring asphalt concrete layer, and the rutting depth of this layer accounts for 63% of the total rut depth. The rutting depth increases rapidly with the increase of pavement thickness, increases with the increase of axial load, and changes with the change of load position, especially the change of transverse load position. The rut disease increases with the increase of ambient temperature, but the relationship between them is nonlinear. This study has certain guiding significance for rutting resistance design, rut prediction and life prediction of the same type of asphalt steel deck.
【学位授予单位】：南京林业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U418.68;U443.33

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