Shear behavior of concrete beams reinforced with closed-type winding glass fiber-reinforced polymer stirrups
Shear behavior of concrete beams reinforced with closed-type winding glass fiber-reinforced polymer stirrups
复制标题
闭式缠绕玻璃纤维增强聚合物箍筋混凝土梁的抗剪性能
DOI：
10.1177/13694332221104280
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发表时间：
2022-05
影响因子：
2.6
通讯作者：
Daiyu Wang
中科院分区：
文献类型：
--
作者：
Ye Yuan;Zhenyu Wang;Daiyu Wang
传统的拉挤纤维增强聚合物(FRP)杆箍筋容易发生弯角过早断裂和搭接腿的粘结滑移破坏。本研究提出了一种新型的FRP抗剪加固--闭合式缠绕GFRP箍筋(CW-GFRP)，其特点是具有全封闭的矩形截面。CW-GFRP箍筋完全避免了滑移，显著提高了箍筋受弯部分的强度。为了探讨CW-GFRP箍筋作为受剪钢筋的可行性，进行了8根普通拉挤箍筋和CW-GFRP箍筋加固混凝土梁的抗剪试验。梁深300 mm，宽150 mm，剪跨比为2.07。研究了箍筋材料、箍筋间距、箍筋宽度对加固效果的影响。试验结果表明，拉挤箍筋出现粘结滑移破坏，而CW-GFRP箍筋加固梁防止了粘结滑移破坏，并表现出较大的刚度、较窄的剪切裂缝宽度和1.09~1.12倍的抗剪承载力。报道了CW-GFRP箍筋典型的劈裂破坏，较小的箍筋宽度有望避免劈裂并最终产生较大的应变。结果表明，新型CW-GFRP箍筋是替代传统拉挤箍筋的FRP抗剪加固的优化形式。基于ACI318-19和CSAS806-14的压杆-拉杆模型用于预测抗剪强度，得到了安全但相对准确的预测。
Conventional pultruded fiber-reinforced polymer (FRP) rod stirrups are susceptible to premature bent corner rupture and bond slip failure of overlapping legs. This research proposed a new type FRP shear reinforcement, closed-type winding GFRP (CW-GFRP) stirrups, featuring a fully closed rectangular cross-section. CW-GFRP stirrups completely avoided slip and significantly improved the strength of bent portion of stirrups. To investigate the feasibility of using CW-GFRP stirrups as shear reinforcement, shear test of 8 concrete beams reinforced with conventional pultruded stirrups and CW-GFRP stirrups was conducted. The beams were 300 mm deep and 150 mm wide, and their shear span ratio were 2.07. The effect of the material of stirrups, the spacing of stirrups, and the width of CW-GFRP stirrups were investigated. The test results showed that pultruded stirrups exhibited bond slip failure, in contrast, CW-GFRP stirrups reinforced beams prevented this failure and showed enhanced stiffness, narrower shear crack width and 1.09–1.12 times higher shear capacity. The splitting failure typical of CW-GFRP stirrups was reported, and a smaller stirrups width is expected to avoid splitting and generate greater strain at ultimate. It can be concluded that the new type of CW-GFRP stirrups is an optimized form of FRP shear reinforcement to supersede conventional pultruded stirrups. Strut-and-tie models based on ACI 318-19 and CSA S806-14 were used to predict the shear strength and produced a safe but relatively accurate prediction.
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影响因子：
3
作者：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
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