EFFECT OF NONLINEAR TEMPERATURE GRADIENT ON CURLING STRESS IN CONCRETE PAVEMENTS

摘要: Temperature and moisture gradients can lead to significant tensile stresses at the slab top bottom. Current techniques for assessing internal due such are based on assumption that temperature distributions through thickness linear. However, actual of have been found be highly nonlinear. A new closed form solution technique calculating in a pavement nonlinear is introduced. The analysis separated into two parts. In first, an expression presented self-equilibrated within cross section restraint (i.e., satisfying equilibrium conditions continuity strain field section). These independent dimensions boundary conditions. second, external self-weight subgrade reaction) calculated using equivalent linear gradient obtained from first part existing solutions by Westergaard or Bradbury. this step includes length Total superposition principle. methodology has applied data studies which profiles were recorded throughout 24-hr period. Linear methods cannot accurately predict curling concrete pavements. This especially pronounced during nighttime early morning hours, predicts stress both bottom before application any traffic loading.