摘要
为研究材料粘弹性对钢桥面浇注式沥青混凝土铺装结构疲劳寿命预估结果的影响,建立粘弹性有限元模型,分析不同荷载作用次数下铺装结构表面拉应变的变化规律,并基于应变控制的铺装面层混凝土疲劳方程预估铺装的使用寿命。结果表明:由于受材料粘弹性特性影响,随着荷载作用次数增加,钢桥面铺装表面拉应变也随之增大,铺装疲劳寿命降低;荷载作用20 000次前变化更为明显,其后则趋于平缓。
In order to research influences of viscoelasticity of materials on estimate of fatigue life of pavement structure of asphalt concrete steel deck, this paper establishes a viscoelasticity finite element model and analyzes change rules of tensile strain on the surface of pavement structure at different action times of load, and estimates the service life of pavement based on strain controlled fatigue equation of surface concrete of pavement. The results show that the tensile strain on the surface of steel deck pavement increases with more action times of load due to influence of viscous and elastic properties, and fatigue life of pavement decreases; the change before 20 000 action times of load is more significant, and then becomes flat.
出处
《公路交通技术》
2015年第5期80-82,88,共4页
Technology of Highway and Transport
基金
国家科技支撑计划项目(2011BAJ09B04)
重庆市交通科技计划项目(KJXM2012-0389)
关键词
桥梁工程
钢桥面铺装
理论分析
粘弹性
浇注式沥青混凝土铺装
疲劳寿命
bridge project
steel deck pavement
theoretical analysis
viscoelasticity
pouring typeasphalt concrete pavement
fatigue life
