摘要
为解决水泥混凝土路面传统钢质传力杆易锈蚀且表面硬度过大的问题,文中采用玻璃纤维聚合物(GFRP)筋作为路用传力杆,通过道路整体结构三维有限元分析,研究了GFRP传力杆在车辆轴载作用于缩缝板边时的荷载传递能力;开发了传力杆的路用性能试验设备,开展了传力杆试件的静力极限试验与拟静力加速加载疲劳试验,研究了GFRP传力杆的抗剪能力与耐疲劳性能。研究发现:为保证水泥混凝土路面缩缝结构的荷载传递能力,GFRP筋的直径需要比传统钢质传力杆增加25%~30%才较为合理,不但满足重载交通条件对传力杆装置的抗剪与抗疲劳性能要求,还可缓解缩缝最不利位置的应力集中状态,降低传力杆周边混凝土承载材料在道路交通环境下的开裂风险。
Glass fibre-reinforced polymers(GFRP)bar has been used as dowels in order to solve the issues of corrosion and hardness caused by traditional steel bar.Focused on the load transfer capacity of GFRP dowels,the three-dimensional finite element model of cement concrete pavement is established,mechanical characteristics of GFRP bar are studied.On this basis,pavement performance testing system of dowel is developed.By using the testing system,limited bearing capacity test and fatigue test are separately conducted to test the shear-bearing capacity and anti-fatigue performance of GFRP dowel.It is found that the diameter of GFRP dowels shall be 25%~30% larger than the common steel bar in order to guarantee the load transfer capacity of the cement concrete pavement contraction joints structure,which can not only meet the shearing and anti-fatigue performance for dowel under heavy traffic load but mitigate the stress concentration state of contraction joint at the most unfavorable position and reduce cracking risk of concrete bearing materials around the dowel.
出处
《公路》
北大核心
2017年第10期11-16,共6页
Highway
基金
国家自然科学基金项目
项目编号50808058
云南省人才培养基金项目
项目编号KKSY201306093
关键词
道路工程
GFRP传力杆
数值模拟
子结构试验
传荷能力
路用性能
road engineering
GFRP dowel
numerical simulation
substructure testl load transferefficiency
pavement performance