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Inclusion of CFRP - epoxy composite for end anchorage in NSM-epoxy strengthened beams

机译:包含CFRP-环氧复合材料用于NSM-环氧加固梁的端锚

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摘要

Nowadays, the use of near surface mounted (NSM) technique strengthening reinforced concrete (RC) structural members is going very popular. The failure modes of NSM strengthened reinforced concrete (RC) beams have been shown to be largely due to premature failure such as concrete cover separation. In this study, CFRP U-wrap end anchorage with CFRP fabrics was used to eliminate the concrete cover separation failure. A total of eight RC rectangular beam specimens of 125 mm width, 250 mm depth, and 2300 mm length were tested. One specimen was kept unstrengthened as a reference; three specimens were strengthened with NSM steel bars and the remaining four specimens were strengthened with NSM steel bars together with the U-wrap end anchorage. The experimental results showed that wrapped strengthened beams had higher flexural strength and superior ductility performance. The results also show that these beams had less deflection, strain, crack width, and spacing.
机译:如今,使用近表面安装(NSM)技术来增强钢筋混凝土(RC)结构构件正变得非常流行。 NSM增强钢筋混凝土(RC)梁的破坏模式已被证明很大程度上是由于过早破坏,例如混凝土覆盖层分离。在这项研究中,使用CFRP纤维将CFRP U型包裹端部锚固用于消除混凝土表层分离失败。总共测试了八个宽度为125 mm,深度为250 mm,长度为2300 mm的RC矩形梁样本。保留一个标本作为参考的强度。 NSM钢筋加固了三个样本,NSM钢筋以及U型包裹端锚固加固了其余四个样本。实验结果表明,包裹增强梁具有较高的抗弯强度和延展性。结果还表明,这些梁的挠度,应变,裂缝宽度和间距较小。

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