Thermal Stresses in Asphalt Overlay Paved on Existing Cement Concrete Pavements (Ⅱ):Approximate Solutions to Section Internal Forces and Interface Forces

Abstract:

The complicated deformation effects in bilayer beams are then decomposed to three types of basic deformation effects including uniaxial tensioncompression effect induced by shrinkage deformation in bottom layered beam regardless of bilayer beams’ bending effect, bending effect caused by horizontal interlayer friction neglecting uniaxial tensioncompression 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 bilayer 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.

Key words:road engineering; asphalt overlay; thermal stress; deformation effect; decomposition and combination; bilayer beams model