Rostami Michael, Sennah Khaled, Hedjazi Saman
Civil Engineering Department, Ryerson University, Toronto, ON M5B 2K3, Canada.
Civil Engineering and Construction Department, Georgia Southern University, 201 COBA Drive, Statesboro, GA 30460, USA.
Materials (Basel). 2019 Aug 5;12(15):2485. doi: 10.3390/ma12152485.
In the present paper, experimental and numerical investigations were conducted on concrete bridge barriers utilizing glass fiber reinforced polymer (GFRP) bars with a hook at their ends. Implementation of these hooked bars instead of the bent bars or headed-end bars in the bridge barriers presented in the Canadian Highway Bridge Design Code (CHBDC) was investigated on American Association for State Highway and Transportation Officials (AASHTO) test level 5 (TL-5) concrete bridge barriers. This research aimed to reach a cost effective and safe anchorage method for GFRP bars at the barrier-deck junction, compared to the conventional bend bars or headed-end bars. Therefore, an experimental program was developed and performed to qualify the use of the recently-developed, small radius hooked bars at the barrier-deck junction. The experimental findings were compared with the design factored applied transverse load specified in CHBDC for the design of the barrier-deck junction as well as factored applied bending moment obtained at the barrier-deck junction using a recently-conducted finite-element modeling. Satisfactory behavior for the developed hooked GFRP bars as well as their anchorage resistance was established and a reasonable factor of safety in design of barrier-deck joint was achieved.
在本文中，对端部带有弯钩的玻璃纤维增强聚合物（GFRP）筋混凝土桥梁护栏进行了试验和数值研究。在美国州公路和运输官员协会（AASHTO）试验等级5（TL - 5）混凝土桥梁护栏中，研究了在加拿大公路桥梁设计规范（CHBDC）中提出的桥梁护栏中使用这些带弯钩的钢筋代替弯筋或带帽端钢筋的情况。本研究旨在找到一种与传统弯筋或带帽端钢筋相比，在护栏 - 桥面连接处对GFRP筋具有成本效益且安全的锚固方法。因此，制定并实施了一个试验计划，以验证最近开发的小半径带弯钩钢筋在护栏 - 桥面连接处的使用情况。将试验结果与CHBDC中规定的用于护栏 - 桥面连接处设计的设计荷载分项横向荷载以及使用最近进行的有限元建模在护栏 - 桥面连接处获得的荷载分项弯矩进行了比较。已确定所开发的带弯钩GFRP筋的良好性能及其锚固抗力，并在护栏 - 桥面连接设计中实现了合理的安全系数。
