摘要
采用分布式光纤传感技术BOTDA研究钢桥面环氧沥青混凝土铺装层裂缝的疲劳扩展规律。通过由铺装层和钢板组成的带切口复合梁的室内三点弯曲疲劳试验,采用BOTDA监测铺装层裂缝疲劳扩展过程,得到铺装层启裂、裂缝扩展直至破坏的各级疲劳荷载作用次数以及埋设于各层的光纤应变值,给出以光纤应变ε为变量的铺装层裂缝扩展模型公式和铺装层裂缝的疲劳扩展规律,本研究成果为钢桥面环氧沥青混凝土铺装层的抗裂设计和抗疲劳设计提供理论基础。
The fatigue propagation of cracking in epoxy asphalt concrete surfacing of steel decks was studied by using BOTDA sensing technology. Based on indoor three-point bending tests of composite beams composed of pavement and steel plate with cuts, the propagation process of cracking was monitored. The number of times of fatigue load action and the optical fiber strain values in each layer at various levels, including initial pavement cracking and cracking propagation till failure, were obtained. The formulas of crack fatigue propagation model with optical fiber strain s as the variable and the fatigue propagation patterns of cracking in pavement were presented. The results may serve as the base for the fatigue resistant and cracking resistant design of steel decks with epoxy asphalt concrete surfacing.
出处
《土木工程学报》
EI
CSCD
北大核心
2009年第10期132-136,共5页
China Civil Engineering Journal
基金
国家自然科学基金(50578038
50658001)
