单周期荷载作用下纤维沥青路面的动态响应

为了研究动荷载作用下纤维沥青路面的响应,基于弹性理论,应用有限元方法分析单周期动荷载作用下,不同的荷载作用时间、路面体阻尼比、土基模量和加载方式对不同纤维沥青路面结构的路表最大弯沉的影响规律.对于不同纤维沥青路面结构:不同荷载作用时间下,路面的动静态弯沉差值基本接近;随着路面体阻尼比的逐渐增加,路面的动态弯沉逐渐减小,但减小率和到达最大动弯沉对应的时间基本接近;随着土基模量的逐渐增加,路面的动态弯沉逐渐减小,但减小率基本接近;半矩形波荷载比半正弦荷载作用下的路面动态弯沉大,而弯沉差值基本接近.分析表明,在单周期动荷载作用下,纤维的加入提高了路面的整体抗变形能力,但对路面的动态弯沉影响规律基本相同.

Dynamic response of fiber reinforced asphalt pavement subjected to single period load

A finite element method based on elastic mechanics was used to investigate the response of polyester fiber reinforced asphalt pavement subjected to dynamic load.The effects of loading period,damp ratio of pavement structure,subgrade modulus and loading mode on the maximum deflection of different fiber reinforced asphalt pavements subjected to single period load were analyzed.For different pavements,the difference between dynamic deflection and static deflection is uniform basically for different loading period.The dynamic deflection decrease with the increase of the damp ratio of pavement,whereas the decreasing rate and the time responding to the maximum deflection are consistent ultimately,moreover the dynamic deflection decrease with increasing subgrade modulus,but the decreasing rate is very close,and the dynamic deflection of pavement subjected to a half rectangle wave load is bigger than that subjected to a half sine wave load,whereas the difference of the deflection is uniform basically.The results show that the resistance to the deformation of asphalt pavement is improved by adding fiber to asphalt concrete,nevertheless the influence on the dynamic deflection for fiber reinforced asphalt pavements subjected to single period load is uniform.