Study On Bond Slip Behavior Of Tie Bar And Dowel Bar Of Cement Concrete Pavement Joints

Cement concrete pavement due to stiffness and lack of deformability, so in the longitudinal and transverse are provided with joints, joint the dowel bar or tie bar is arranged improperly, will also affect the joint transmission bearing capacity and the edge of the pavement slab under too much stress, when the dowel bar or tie bar corrosion, will also affect the pavement durability and service life, accelerated pavement damage. On the joint of cement concrete pavement with different diameters the dowel bar and tie bar in the smear antirust coating interface and Study on the bond slip properties in concrete, cement concrete pavement joint the dowel bar and tie bar reasonable design and finite element simulation calculation parameters are provided.Combined with test requirements and specifications, The concrete flexural strength is set to 4.5MPa,5.0 MPa,5.5 MPa, and the tie bar diameter is 14 mm and 16 mm, dowel bar adopts the diameter of 28 mm,32 mm,36 mm, and iron oxide antirust paint and anti rust painted as coating reinforced asphaltThrough of reinforcing bar and concrete of bond slip curve and degradation rate analysis found that peak bond strength with concrete flexural strength is proportional to, with reinforcing bar diameter is inversely proportional, while the degradation rate and the peak bond strength instead. Bond stress distribution uniform degree with cement concrete flexural strength is proportional to, and reinforced diameter is inversely proportional to the, and in the smear anti-rust paint in, the bond stress distribution curve and wipe antirust paint specimens compared to more uniform, indicating that the bond stress in the Monolithic Reinforced transmission pass faster.In the calculation of steel bond stress distribution data, establish three line position function bond stiffness distribution ψ(x) model. Then, the bond slip constitutive model is simplified to six segment line type relationship, and the key parameters to determine the theoretical model are proposed, and the corresponding key parameters are calculated, and the curve of bond slip constitutive relation is fitted. Finally, the bond slip constitutive relation of the tension rod and the force transfer rod is obtained by the product of the basic constitutive relation and the internal bond stiffness distribution function.