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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。
In order to solve the problem of easy rusting and excessive surface hardness of traditional steel dowel bar on cement concrete pavement, fiber reinforced polymer (GFRP) bars are used as force bar in the article. Through the three-dimensional finite element analysis of the overall structure of the road, GFRP The load transfer capability of the dowel bar when the axle load of the vehicle acts on the side of the shrink plate is developed. The road performance test equipment of the dowel bar is developed and the static limit test and quasi-static acceleration loading fatigue of the dowel bar test are carried out Experimental study of the shear strength and fatigue resistance of GFRP dowel bar. The results show that it is reasonable to increase the diameter of GFRP tendons by 25% ~ 30% compared with that of traditional steel dowel bars in order to ensure the load transfer capacity of the shrinkage structure of cement concrete pavement. Shear and anti-fatigue performance requirements, but also ease the most unfavorable position shrinkage stress concentration state, reducing the force around the concrete load-bearing material in the road traffic environment cracking risk.