沥青路面结构层弯拉应力与应变的近似计算

研究了各种条件下沥青路面结构弯拉应力和应变规律,引入曲面系数修正竖向压应力和剪应力的影响,引入面层弯曲中性轴下移量参数修正层间光滑与连续之间的差异,引入面层与基层弯矩分配系数反映面层、基层弯曲曲率不同的影响;对于模量不均匀面层,提出了弯曲刚度等效原则换算式;最后,讨论了各种条件下的沥青面层层底弯拉应变、半刚性或刚性基层层底弯拉应力的计算精度,其误差均不超过5%.

Approximate Calculation of Flexural Stresses and Tensile Strains in Asphalt Pavements

The flexural stresses and tensile strains in asphalt pavement layers were studied. The hood face coefficient was proposed to characterize the influences of vertical compression stresses and shear stresses on the flexural stresses and tensile strains; the neutral axis moving coefficient was introduced to describe the differences between smooth contact and full friction contact in layers; the flexure torque distribution coefficient was put forward to show the influences of different bend curvature on asphalt layer and base. As to asphalt pavement with nonuniform modulus, the surface equivalent modulus was deduced by bending rigidity equivalent principle, and then the errors of the approximate calculation methods for the tensile strains at the bottom of surface and the flexural stresses at the bottom of base in asphalt pavement whit nonuniform modulus were discussed. Usually, the approximate calculation errors are less than 5%.