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Experimental investigation on the bond performance of a hybrid lap-spliced connection of GFRP and stainless steel bars in concrete
Cement and Concrete Composites ( IF 10.8 ) Pub Date : 2025-01-25 , DOI: 10.1016/j.cemconcomp.2025.105952
Jiafeng Zhou, Jitong Zhao, Mengyan Peng, Marco Liebscher, Viktor Mechtcherine, Steffen Marx, Chongjie Kang
Cement and Concrete Composites ( IF 10.8 ) Pub Date : 2025-01-25 , DOI: 10.1016/j.cemconcomp.2025.105952
Jiafeng Zhou, Jitong Zhao, Mengyan Peng, Marco Liebscher, Viktor Mechtcherine, Steffen Marx, Chongjie Kang
This paper investigates the bond performance of a hybrid lap-spliced connection of glass fiber reinforced polymer (GFRP) bars and stainless steel bars in concrete. To gain a comprehensive understanding, micro-level and macro-level mechanical studies are conducted. First, the microstructural characterization of GFRP bars is performed to comprehend the specific material features. Then, cantilever tests are conducted to identify the optimal direction of bar grooves, which is pre-cut by a machine, and to place the distributed fiber optical sensor (DFOS). Subsequently, four-point flexural tests are carried out on eight large-scale specimens to investigate the influence of lap-spliced length and type on the specimen responses. The DFOSs are employed in the grooves of lap-spliced GFRP and stainless steel bars to characterize their bond behaviors. The findings indicate a significant enhancement in load capacity, with an increase of approximately 10 kN for every 100 mm increase in the lap-spliced length. Furthermore, the incorporation of a hybrid connection, combining GFRP and stainless steel bars, demonstrates a slight improvement of 5 kN in load capacity over the pure lap-spliced connection of stainless steel bars. Additionally, detailed investigations are conducted on the strain distributions in the lap-spliced bars.
中文翻译:
GFRP 与不锈钢筋混合搭接连接在混凝土中的粘接性能试验研究
本文研究了玻璃纤维增强聚合物 (GFRP) 筋和不锈钢筋在混凝土中的混合搭接连接的粘合性能。为了获得全面的理解,进行了微观和宏观层面的机械研究。首先,对 GFRP 棒材进行微观结构表征,以了解特定的材料特性。然后,进行悬臂测试以确定棒材槽的最佳方向,该槽由机器预先切割,并放置分布式光纤传感器 (DFOS)。随后,对 8 个大型试样进行了四点弯曲试验,以研究搭接长度和类型对试样响应的影响。DFOS 用于搭接 GFRP 和不锈钢棒的凹槽中,以表征它们的粘合行为。研究结果表明,负载能力显著提高,搭接长度每增加 100 毫米,负载能力就会增加约 10 kN。此外,结合 GFRP 和不锈钢棒的混合连接,与不锈钢棒的纯搭接连接相比,负载能力略微提高了 5 kN。此外,还对搭接棒材中的应变分布进行了详细研究。
更新日期:2025-01-28
中文翻译:
GFRP 与不锈钢筋混合搭接连接在混凝土中的粘接性能试验研究
本文研究了玻璃纤维增强聚合物 (GFRP) 筋和不锈钢筋在混凝土中的混合搭接连接的粘合性能。为了获得全面的理解,进行了微观和宏观层面的机械研究。首先,对 GFRP 棒材进行微观结构表征,以了解特定的材料特性。然后,进行悬臂测试以确定棒材槽的最佳方向,该槽由机器预先切割,并放置分布式光纤传感器 (DFOS)。随后,对 8 个大型试样进行了四点弯曲试验,以研究搭接长度和类型对试样响应的影响。DFOS 用于搭接 GFRP 和不锈钢棒的凹槽中,以表征它们的粘合行为。研究结果表明,负载能力显著提高,搭接长度每增加 100 毫米,负载能力就会增加约 10 kN。此外,结合 GFRP 和不锈钢棒的混合连接,与不锈钢棒的纯搭接连接相比,负载能力略微提高了 5 kN。此外,还对搭接棒材中的应变分布进行了详细研究。