Experimental investigation of bond behaviour of two common GFRP bar types in high - Strength concrete
Experimental investigation of bond behaviour of two common GFRP bar types in high - Strength concrete
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DOI：
10.1016/j.conbuildmat.2018.12.175
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发表时间：
2019-03-20
影响因子：
7.4
通讯作者：
Sheehan, Therese
中科院分区：
文献类型：
--
作者：
Saleh, Najia;Ashour, Ashraf;Sheehan, Therese
虽然已经进行了几项研究，调查粘结应力-滑移性能的玻璃纤维增强聚合物（GFRP）钢筋嵌入高强混凝土（HSC）使用拔出法，有没有发表的工作，粘结性能的GFRP钢筋嵌入高强混凝土使用铰接梁。本文介绍了由28根按RILEM规范制备的铰接梁组成的试验工作。通过分析以下参数对高强混凝土中GFRP筋粘结性能的影响进行了研究：筋直径（9.5、12.7和15.9 mm）、埋置长度（5和10倍筋直径）、表面结构（螺旋缠绕轻微覆砂（HW-SC）和覆砂（SC））和筋位置（顶部和底部）。四个铰接梁加固16毫米钢筋也进行了比较的目的。大多数梁标本失败的拔出。对试件的外观检查表明，GFRP（HW-SC）筋的粘结破坏主要是由于筋的表面损伤，而GFRP（SC）筋的粘结破坏主要是由于覆砂层脱落。螺旋缠绕和表面覆砂的GFRP筋表现出不同的粘结性能，发现表面覆砂的粘结性能优于螺旋缠绕。粘结强度随埋置长度和钢筋直径的增加而降低。还观察到底部钢筋的粘结强度高于顶部钢筋的粘结强度。结合强度与ACI-440.1R、CSA-S806和CSA-S6规范中给出的预测方法进行了比较。所有的设计准则都低估了嵌入高强混凝土中的两种GFRP钢筋的粘结强度。(C)2018爱思唯尔有限公司版权所有
Although several research studies have been conducted on investigating the bond stress - slip behaviour of Glass-Fibre Reinforced Polymer (GFRP) bars embedded in high strength concrete (HSC) using a pull-out method, there is no published work on the bond behaviour of GFRP bars embedded in high strength concrete using a hinged beam. This paper presents the experimental work consisted of testing 28 hinged beams prepared according to RILEM specifications. The investigation of bond performance of GFRP bars in HSC was carried out by analysing the effect of the following parameters: bar diameter (9.5, 12.7 and 15.9 mm), embedment length (5 and 10 times bar diameter), surface configuration (helical wrapping with slight sand coating (HW-SC) and sand coating (SC)) and bar location (top and bottom). Four hinged beams reinforced with 16 mm steel bar were also tested for comparison purposes.The majority of beam specimens failed by pull-out. Visual inspection of the test specimens showed that the bond failure of GFRP (HW-SC) bars usually occurred owing to the bar surface damage, while the bond failure of GFRP (SC) bars was caused due to the detachment of sand coating. The GFRP bars with helical wrapping and sand coated surface configurations showed different bond behaviour and it was found that the bond performance of the sand coated surface was better than that of the helically wrapped surface. Bond strength reduced as the embedment length and bar diameter increased. It was also observed that the bond strength for the bottom bars was higher than that of the top bars. The bond strength was compared against the prediction methods given in ACI-440.1R, CSA-S806 and CSA-S6 codes. All design guidelines underestimated the bond strength of both GFRP re-bars embedded in high strength concrete. (C) 2018 Elsevier Ltd. All rights reserved.