摘要
基于损伤-断裂力学理论和Miner线性累计损伤理论,分别建立铺装新体系的疲劳寿命预估模型,并通过室内抗弯疲劳试验验证了两种模型的差异。研究结果表明:预测实际钢桥面-超薄UHPC-TPO铺装体系的疲劳寿命时,相比Miner理论,采用损伤-断裂力学模型得到的结果更为合理,预估疲劳寿命为1 446.57万次。同时,疲劳试验结果表明,两个试件分别经历390.7万次和430.1万次疲劳循环后的刚度平均下降11.4%,剩余强度平均下降13%,抗弯疲劳性能良好。
Based on damage-fracture mechanics theory and Miner linear cumulative damage theory,the fatigue life prediction models of new pavement system were established,and the differences between two models were verified by the indoor flexural fatigue tests.The results show that when the fatigue life of actual steel deck-ultra thin UHPC-TPO bridge deck system is predicted,comparing with the Miner theory,the results obtained from the damage-fracture mechanics model are more reasonable and the estimated fatigue life is 14 465 700 times.At the same time,the fatigue test results show that after 3.907 million times and 4.301 million times of fatigue cycles respectively,the stiffness of two specimens decreases by 11.4％on average,and the residual strength decreases by 13％on average,while the bend fatigue resistance is fairly good.
出处
《重庆交通大学学报（自然科学版）》
CAS
北大核心
2017年第4期1-6,11,共7页
Journal of Chongqing Jiaotong University(Natural Science)
基金
国家自然科学基金项目(51178177)
关键词
桥梁工程
钢桥面
超薄UHPC层
疲劳寿命预估模型
抗弯疲劳
bridge engineering
steel bridge deck
ultra-thin UHPC layer
fatigue life prediction method
bend fatigue
