沥青面层的截面弯曲刚度当量模量计算

Calculation of Sectional Flexural Stiffness Equivalent Modulus of Asphalt Pavement

讨论了各种结构和层间接触条件下等截面弯曲刚度的换算方法,并给出了计算式,当温度沿面层层厚线性分布时,给出了沥青面层当量模量简便的代数计算式,对比分析了几种不同面层当量模量的弯沉计算误差。结果表明:采用所提出的等截面弯曲刚度当量模量所得到的弯沉精度较高,相对误差一般不超过5%;采用面层中点温度所对应的当量模量,在沥青面层与下卧层层间连续,以及温度沿面层层厚分布变化比较剧烈时,其弯沉计算相对误差有可能超过15%;采用面层平均温度所对应的当量模量计算得到的弯沉相对误差有可能超过10%。

The methods for sectional flexural stiffness equivalent conversion of asphalt pavement in different structures with different interlayer contact conditions were discussed and the modulus formulas were presented especially when temperature changed linearly along the depth of the asphalt pavement. The deflection errors in different temperatures were contrasted. The results show that the deflection based on sectional flexural stiffness equivalent modulus has the relative error less than 5%, which is of the best precision. However, when asphalt pavement is in full contact with the subjacent bed or the temperature changes intensely along the depth of asphalt pavement, the relative deflection error based on the mid-depth temperature of asphalt pavement will exceed 15%, and the relative deflection error based on the average temperature of asphalt pavement will also exceed 10 %