基于粘弹性沥青路面疲劳性能的数值模拟研究
发布时间：2018-08-30 14:35
【摘要】：沥青混凝土路面主要破坏形式为疲劳破坏。分析了沥青胶浆粘弹性疲劳损伤原理,建立了粘弹性连续损伤力学模型,根据ANSYS9.0软件模拟计算得出以下几点结论:相同粉胶比下SBS改性沥青损伤速率小于高粘高弹沥青;材料损伤速率越低疲劳寿命越长,胶浆疲劳性能受粘弹性影响较大。在温度为15℃1 000次疲劳荷载作用不同级配沥青混合料情况下,当粘弹比从8增大到9.5过程中沥青竖向变形从2 mm增大到6 mm翻了三倍,在实际工程中可适当降低粘弹比以减弱沥青路面竖向变形;在疲劳荷载为4 000次情况下AC-5级配类型竖向变形约为AC-13级配类型竖向变形的两倍,前者存储模量大于后者导致变形积累速率小于后者。
[Abstract]:The main failure form of asphalt concrete pavement is fatigue failure. The viscoelastic fatigue damage principle of asphalt paste is analyzed, and the viscoelastic continuous damage mechanics model is established. According to the simulation calculation of ANSYS9.0 software, the following conclusions are drawn: the damage rate of SBS modified asphalt is lower than that of high viscosity and high elastic asphalt under the same powder / binder ratio; The lower the damage rate, the longer the fatigue life, the fatigue property of the paste is greatly affected by viscoelasticity. When the temperature is 15 鈩，
本文编号：2213366
[Abstract]:The main failure form of asphalt concrete pavement is fatigue failure. The viscoelastic fatigue damage principle of asphalt paste is analyzed, and the viscoelastic continuous damage mechanics model is established. According to the simulation calculation of ANSYS9.0 software, the following conclusions are drawn: the damage rate of SBS modified asphalt is lower than that of high viscosity and high elastic asphalt under the same powder / binder ratio; The lower the damage rate, the longer the fatigue life, the fatigue property of the paste is greatly affected by viscoelasticity. When the temperature is 15 鈩，
本文编号：2213366
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