考虑板底脱空的水泥混凝土路面计算分析

发布时间：2018-04-10 11:00

本文选题：水泥混凝土路面 + 板底脱空　；参考：《大连理工大学》2014年硕士论文

【摘要】：脱空是水泥混凝土路面常见的破坏形式之一。当路面板底部出现脱空现象时,水泥混凝土路面受力模式发生改变,特别是当路面板角处底部发生脱空时,处于脱空位置的路面板近似于悬臂板,在车辆荷载的作用下脱空位置的边缘处会产生较大的应力,而板角处则会产生过大的挠度,严重影响路面的使用性能。我国现行水泥混凝土路面的设计方法尚未考虑路面板底脱空的影响,导致路面板底部发生脱空现象后,路面很容易发生破坏,因此,需要有一套考虑板底部脱空的路面设计方法来完善现有的设计理论,而对板底部脱空路面荷载应力和挠度的计算,可以为考虑板底部脱空的路面设计方法提供理论分析依据。本文介绍了两种求解板底部脱空路面挠度和荷载应力的方法——解析法和数值法,并重点用数值法对板底部脱空路面进行了计算分析。利用有限元程序ABAQUS建立了板底部脱空路面三维有限元模型,分析了在车辆荷载作用下板底脱空路面的受力情况,计算表明当路面板角处底部发生脱空时,路面挠度随脱空面边长的增大显著增加,其对应关系可用指数函数表征。当路面板边纵缝底部发生脱空时,路面挠度与脱空面边长也呈指数对应关系。本文通过对不同脱空尺寸路面有限元计算结果的统计分析,得出了板角处和板边纵缝处底部脱空路面挠度和脱空面边长的关系式；通过对不同面层厚度的板底脱空路面挠度的计算分析,给出了脱空路面挠度和路面板厚度的关系式；通过对不同基层弹性模量路面应力的计算分析,得到了板的荷载应力和基层弹性模量的关系式。最后,本文对解析法和数值法进行了简要阐述,并对比分析了两种计算方法的优缺点。本文通过对板底脱空水泥路面的计算分析得到了有意义的结论,对板底脱空水泥路面设计理论的提出有一定的参考作用。
[Abstract]:Void is one of the common failure forms of cement concrete pavement.When the void phenomenon appears at the bottom of the road slab, the stress mode of cement concrete pavement changes, especially when the bottom of the road slab corner occurs void, the road slab in the void position is similar to the cantilever slab.Under the action of vehicle load, the edge of the void position will produce greater stress, while the deflection of the plate corner will be too large, which will seriously affect the performance of the pavement.The present design method of cement concrete pavement in our country has not considered the influence of the void on the floor of the pavement slab, which leads to the phenomenon of void at the bottom of the pavement slab, and the pavement is liable to be destroyed.It is necessary to have a set of pavement design methods considering the void at the bottom of the slab to perfect the existing design theory, and the calculation of the load stress and deflection of the empty pavement at the bottom of the slab can provide a theoretical analysis basis for the design method of the pavement considering the void at the bottom of the slab.In this paper, two methods to solve deflection and load stress of slab bottom voids pavement are introduced, which are analytic method and numerical method, and the numerical method is used to calculate and analyze the empty pavement at the bottom of slab.Using finite element program ABAQUS, the three-dimensional finite element model of slab bottom empty pavement is established, and the stress situation of slab bottom empty pavement under vehicle load is analyzed. The calculation shows that when the bottom of the road slab corner occurs void,The deflection of pavement increases significantly with the increase of the side length of the clearance surface, and the corresponding relation can be expressed by exponential function.When the bottom of the longitudinal joint of the slab edge is empty, the deflection of the pavement is exponentially related to the side length of the clearance surface.Based on the statistical analysis of the finite element calculation results of pavement with different void sizes, the relationship between deflection and side length of the empty pavement at the bottom of the plate corner and the longitudinal joint of the plate edge is obtained in this paper.Through the calculation and analysis of the deflection of the pavement with different surface thickness, the relationship between the deflection of the defected pavement and the thickness of the pavement slab is given, and the stress of the pavement with different elastic modulus of the base is calculated and analyzed.The relationship between the load stress and the elastic modulus of the base is obtained.Finally, the analytical method and the numerical method are briefly described, and the advantages and disadvantages of the two methods are compared and analyzed.In this paper, a meaningful conclusion is obtained through the calculation and analysis of the slab bottom voids cement pavement, which can be used as a reference for the design theory of the slab bottom empty cement pavement.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.216

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