动荷载作用下纤维沥青路面的黏弹性响应

目的为了分析动荷载作用下纤维的加入对路面黏弹性响应的影响.方法以Burgers模型模拟纤维沥青混凝土的黏弹性性质,基于黏弹性理论,应用有限元方法分析单周期动荷载作用下,不同荷载作用时间对不同纤维沥青路面的路表各点最大竖向位移和卸载后加载中心点竖向位移的影响规律.结果纤维加入到沥青路面后,减小了路面的竖向位移;对于不同纤维沥青路面结构,在荷载作用时间较短时,路面结构的流变性质不显著;荷载作用时间较长时,卸载后还有部分残余变形不能恢复,但路面响应规律基本相同.结论纤维的加入提高了路面的整体变形能力,但没有明显改变沥青混凝土的黏弹性性质;在单周期动荷载作用下,若荷载作用时间很短时,可以忽略纤维沥青混凝土的黏弹性特征.

Viscoelastic Response of Fiber Reinforced Asphalt Pavement Subjected to Dynamic Load

The primary goal of this research is to analyze the influence of inclusion of fiber on viscoelastic response of polyester fiber reinforced asphalt pavement subjected to dynamic load,the Burgers model was used to describe the viscoelastic behaviors of fiber reinforced asphalt concrete.The effect of load period on the maximum deflection of road surface,and vertical displacement of center point of load for different fiber reinforced pavements subjected to single period dynamic load was analyzed by finite element method based on viscoelastic mechanics.The results indicate the vertical displacement of pavement decreased after adding fiber into the pavement.The viscoelastic response of fiber reinforced asphalt pavement was weak for short load period.There was residual deformation after unload when load period was long,however,the response was similar to different fiber reinforced pavements.The research we have done suggests the antideformation of fiber reinforced asphalt pavement is improved and the viscoelasticity of asphalt concrete is not evidently changed for inclusion of fiber.The viscoelasticity of fiber reinforced concrete subjected to single period dynamic load may be neglected for short load period.