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Effect of Harsh Environmental Conditions on the Bond-Dependent Coefficient of GFRP Bars in Concrete Beams

机译：恶劣环境条件对混凝土梁中GFRP筋粘结相关系数的影响

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Fiber-reinforced polymer bars are considered a viable alternative to steel reinforcing bars in reinforced concrete structures due to their non-corrosive properties, higher tensile strength, light weight and high fatigue endurance. In this study, the bond-dependent coefficient of glass fiber-reinforced polymer bars (GFRP) in reinforced concrete beams, exposed to harsh environmental conditions, is investigated. A set of GFRP bars were exposed for a period of 6 months to harsh conditions of direct sunlight and seawater, and another set of GFRP bars were exposed to sunlight only. After the exposure period, a total of six beams were cast and tested, with three beams reinforced with GFRP bars exposed to sunlight only, and three beams reinforced with GFRP bars exposed to sunlight and seawater. Three different GFRP bar diameters of 11.2 mm, 17.2 mm and 24.2 mm, were used. Tensile tests were conducted on the GFRP bars after the exposure period to determine the tensile strength and elastic modulus of the bars. The crack widths of the beams were measured and recorded, and the bond-dependent coefficient values were evaluated at crack widths of 0.7 mm. The average value of the bond-dependent coefficient ranged between 0.7 and 1.0, which is within the range of values reported for bond-dependent coefficient for GFRP bars in the literature. This shows that the harsh exposure conditions had no significant effect on the bond between the GFRP bars and concrete.
机译：纤维增强的聚合物棒由于其无腐蚀性，较高的拉伸强度，重量轻和高耐疲劳性，因此被认为是钢筋混凝土结构中钢增强棒的可行替代品。在这项研究中，研究了暴露在恶劣环境条件下的钢筋混凝土梁中玻璃纤维增​​强聚合物棒（GFRP）的粘结依赖性系数。一组GFRP钢筋暴露在阳光直射和海水的恶劣条件下6个月，而另一组GFRP钢筋仅暴露在阳光下。暴露期过后，总共浇铸和测试了六根梁，其中三根仅用GFRP筋加固的梁暴露在阳光下，三根用GFRP筋加固的梁暴露在阳光和海水下。使用了三种不同的GFRP棒直径，分别为11.2 mm，17.2 mm和24.2 mm。暴露时间后，对GFRP钢筋进行拉伸试验，以确定钢筋的拉伸强度和弹性模量。测量并记录梁的裂缝宽度，并在裂缝宽度为0.7 mm的情况下评估与粘结有关的系数值。键依赖性系数的平均值在0.7至1.0之间，这在文献中所报道的GFRP棒的键依赖性系数的值的范围内。这表明苛刻的暴露条件对GFRP筋和混凝土之间的粘结没有显着影响。

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