The Study Of Thermal Stress And Early Crack For Continuously Reinforcement Concrete Pavement

CRCP(continuously reinforced concrete pavement) has already been applied widely in many countries due to its multitudinous fine performance. Systematic research has also been carried out in this field in our country.The paper based on the linear bond-slip relation and the nonlinear bond-slip relation between reinforced steel bar and concrete, the calculation model compared with free deformation and the equilibrium differential equations are established for the analysis of the thermal stress in CRCP, the stiffness matrix is also derived based on the contact theory. The analytic solution and the numerical solution are obtained based on the linear bond-slip relation. The distribution law of stress and deformation in CRCP and calculation parameters for crack spacing are analyzed under the thermal load. And it is contrasted with the solution from linear relation. It indicates that the FEM numerical solution is reliable. The nonlinear numerical solution is also obtained of the bar system and the bond stress solution is derived. It is not found the right contact FEM numerical solution to analyze the bond-slip between the reinforced steel bar and the concrete. The contact FEM is clear for calculation and the formula provided is easy to analyze the thermal stress in CRCP, it can provide theory for design and research in the future.Simultaneity based on the linear and nonlinear bond-slip relation between reinforced steel bar and concrete, the calculation model are established under thermal stress and the stiff matrix are deduced based on the contact theory for the analysis of CRCP. The FEM numerical solution is obtained。The main affecting factors of the early crack development of CRCP is studied, the variation law of max space between cracks and the max width of crack with age are obtained. The early crack development is stable when the age exceeds 90 days. The reinforced ratio and the reinforced type are important parameters for max crack space and the maxwidth of early crack in CRCP when curing time is 90 days. It indicates that it is important to select reasonable reinforced ratio and reinforced type for the early-crack development control of CRCP. It provides theory gist for design and research in the future.