Abstract:The complicated deformation effects in bilayer beams are then decomposed to three types of basic deformation effects including uniaxial tensioncompression effect induced by shrinkage deformation in bottom layered beam regardless of bilayer beams’ bending effect, bending effect caused by horizontal interlayer friction neglecting uniaxial tensioncompression deformation in bottom layered beam, and bending effect created by curling deformation in bottom layered beam, the analytical solutions to the above three basic deformation effects in bilayer beams are obtained accordingly. Furthermore, the combinations and influences among those three basic deformations while shrinkage and curling deformation occurs in bottom layered beam are discussed; a group of concise formulas for sectional internal forces in asphalt overlay, interface reaction force and interface shearing stress is provided, and the concise formulas for calculating internal forces in asphalt overlay also prove to be precise enough.