Research on Mechanical Performance of Dowels for Cement Concrete Pavement under Heavy-duty Traffic in Wumeng Mountain Area
In view of the heavy traffic,frequent rainfall and fog,as well as large temperature difference between day and night in the Wumeng Mountain area of Northeast Yunnan Province,in the paper relying on the study of the dowels system of concrete pavement in the under-construction Zhaoyang West Ring Expressway in Zhaotong City,and based on the ABAQUS finite element platform,the mechanical responses of concrete materials and joint structures around dowels under common pavement defects such as void at beneath slab caused by high axle loads and large temperature differences are analyzed through three-dimensional numerical simulations.It is found that as the axle load and width of void increase,the maximum stress of concrete around the bars continuously rises,and under severe overload,the maximum tensile stress of the concrete reaches 8.416 MPa,close to the ultimate tensile strength of the concrete.Under the positive temperature gradient,the increase of axial load will reduce the deflection ratio on both sides of the joint,and the cavitation size has little effect on the deflection ratio.Under negative temperature gradient,shaft load size and void size have minor influence on the deflection ratio of both sides of the joint.Based on the above analysis results,the optimal design suggestions and construction and maintenance countermeasures for the transverse joint force transfer rod device of ordinary cement concrete pavement in this area are put forward.
road engineeringconcrete pavementheavy-duty trafficvoid at bottom slabdowelsmechanical performance
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