导　　师： 陈拴发

学科专业： 082301

授予学位： 硕士

作　　者： ;

机构地区： 长安大学

摘　　要： 水泥混凝土路面具有强度高、刚度大、稳定性和耐久性好以及日常养护工作量小的优点,因而得到了广泛应用。然而,现行水泥混凝土路面设计标准,在计算过程中采用四边自由矩形板为计算基础,与实际使用中的路面形式存在明显的差距。因此,建立更接近于实际的水泥混凝土路面模型,分析水泥混凝土路面的受力情况,对保证水泥混凝土路面结构设计的可靠性具有重要的意义。 本文利用有限元分析软件ANSYS建立水泥混凝土路面多块板模型。分析模型板块数量对面层板底最大拉应力的影响,得到随板块数量增加,荷载应力减小,温度应力增大的规律。确定了三种模型用于应力计算,即3块板,6块板,9块板模型。其中9块板模型为四周均受杆件约束的全约束路面模型。 分析不同参数对面层荷载应力的影响规律。通过模型计算值与《公路水泥混凝土路面设计规范/(JTG D40-2002/)》公式解之间的对比,得到在最不利条件下,设置拉杆是减小面层荷载应力的有效措施。在此基础上,采用均匀设计的方法进行参数组合,对计算结果进行回归分析,从而修正规范公式中的应力折减系数。分析不同参数对面层温度应力的影响规律,发现杆件对面层温度应力的影响很小。拟合计算结果,对规范公式进行修正。通过对荷载应力和温度应力两个方面的修正,得到更接近于实际使用状态的半刚性基层和刚性基层水泥混凝土路面设计标准。 The Portland cement concrete pavements has got the extensive application all over the world, with the advantage of high strength, strong stiffness, good stability, great durability and little work in conventionality maintenance.However, there is a big difference between the actual situation and traditional design standards, which based on the calculation of rectangular plate with four free edges.Doing researching on new kinds of concrete pavement models and stress analysis, therefore, has great importance in assuring pavements'reliability. This paper adopts ANSYS to build road models.After analyzing the relationship between plates and stress, it comes to the results of that, the number of plate increases, the lode stress reduces and temperature stress increases. There are three models are determined to apply to calculating:three plates, six plates and nine plates model.Nine plates model is the model of all constraints. First, analyses the influence law of different parameters to the load stress of road. Compared the calculation of models with specification,it is found that, at the wors-case, setting draw bars can reduce load stress a lot. Based on this result, using the methods of uniform design and regression analysis, make modification of stress reduction coefficient in specification.Then analyses the influence law of different parameters to the temperature stress of road. It is found that draw bars do little influences on the temperature stress.After regression analysis,make modification of stress reduction coefficient in specification.At last, it comes to the design standards of semi-rigid and rigid base.

关 键 词： 水泥混凝土路面 全约束 板块模型 荷载应力 温度应力 应力折减系数

领　　域： [交通运输工程]