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。
The main form of failure of asphalt concrete pavement is fatigue failure. Analysis of the principle of fatigue damage of asphalt mortar viscoelastic continuum d a m a g e mechanics model is es-tablished , viscoelastic, according to the A N S Y S 9. 0 software simulation results are as follows the s a m e powder binder ratio of SBS modified asphalt d a m a g e rate is less than the G a o Niangaoterial damage rate is low; the longer fatigue life, fatigue performance is influenced by the visco elasticmortar effect. At the temperature of 15 DEG 1 000 times fatigue loads of different asphalt mixtures under the condition, when the viscoelastic asphalt ratio increased from 8 to 9. 5 in the process of vertical d e-formation increases from 2mm to 6mm over three times , in the actual project m a y be the viscoelastic than to weaken the vertical deformation of asphalt pave m e n t for vertical A C - 5 and A C - 13; two kinds of gradation type deformation calculation in fatigue load is 4000 times of A C - 5 vertical deformation is about two times of AC - 13 vertical deformation,so the storage modulus is greater than the latter , because the storage leads to m o r e elastic deformation accumulation rate is smaller.
出处
《公路工程》
北大核心
2017年第5期312-315,326,共5页
Highway Engineering
基金
浙江省交通运输厅科研计划项目(2014T16)
关键词
疲劳破坏
数值模拟
竖向变形
存储模量
fatigue failure
numerical simulation
vertical deformation
storage modulus
