摘要
文中基于Schapery伪变量理论与广义弹性-黏弹性对应原理,将沥青混合料在半正矢循环加载试验下的应力-应变曲线转换为应力-伪应变曲线,利用变化模量定义损伤变量,利用改进的Miner线性疲劳损伤模型拟合对1000次循环加载下的损伤变量,得到损伤模型参数,利用上述模型对2000次循环加载下的损伤变量进行预测.结果表明:应力-伪应变曲线可以消除沥青混合料应力-应变的滞后效应并呈现出简单的线性关系.改进的Miner线性疲劳损伤模型对损伤变量的预测结果良好,通过应力-伪应变的变化模量定义的损伤变量能够有效地表征沥青混合料的疲劳损伤.
Based on Schapery pseudo-variable theory and generalized elastic-viscoelastic correspondence principle,the stress-strain curve of asphalt mixture under semi-normal cyclic loading test was transformed into stress-pseudo-strain curve.The damage variable was defined by changing modulus,and then the damage variable under 1000 cyclic loading was fitted by using the improved Miner linear fatigue damage model.The parameters of the damage model were obtained,and the damage variable under 2000 cyclic loading was predicted by using the above model.The results show that the stress-pseudo strain curve can eliminate the lag effect of stress-strain of asphalt mixture and present a simple linear relationship.The improved Miner linear fatigue damage model can predict the damage variables well,and the damage variables defined by the modulus of change of stress-pseudo-strain can effectively characterize the fatigue damage of asphalt mixture.
作者
杨龙
朱云升
王先镕
YANG Long;ZHU Yunsheng;WANG Xianrong(Hunan Provincial Communications,Survey&Design Institute Co.Ltd.,Changsha 410000,China;School of Transportation and Logistics Engineering,Wuhan University of Technology,Wuhan 430063,China;College of Civil Engineering and Architecture,Nanchang Hangkong University,Nanchang 330063,China)
出处
《武汉理工大学学报（交通科学与工程版）》
2023年第4期710-715,共6页
Journal of Wuhan University of Technology（Transportation Science & Engineering）
关键词
道路工程
沥青混合料
伪变量理论
疲劳损伤
应力-伪应变曲线
road engineering
asphalt mixture
pseudo variable theory
fatigue damage
stress vs.pseudo-strain curves
