The Mechanical Analysis of Cement Concrete Surface Layer With Load - transfer Bar for Joints Based on Computer

Abstract

To establish a joint dowel bar and dowel bar set of cement concrete pavement structure in three dimensional finite element model, using the method of numerical analysis, analysis of the joint of cement concrete road surface of the load stress, deflection and deflection difference, to study the foundation modulus, dowel bar diameter on the load stress and the influence law of deflection is poor, and the condition of the same calculation results are analyzed in comparison. The results show that the principal stress, shear stress, deflection value and deflection difference decrease with the increase of the diameter of the rod. When the diameter of the transmission rod is greater than 35mm, the effect of increasing the diameter of the transmission rod on reducing the stress value at the calculated point in the cement concrete surface layer is not obvious. The calculated point load stress and deflection difference of cement concrete surface layer are obviously less than the calculated results when no load rod is installed in joints. When the foundation modulus is not greater than 800MPa, it is suggested to estimate the joint load transfer efficiency based on shear stress: when the foundation modulus is greater than 800MPa, it is suggested to estimate the joint load transfer efficiency based on the bending and sinking value or the principal stress[1-2].