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首页> 外文期刊>Journal of Composites for Construction >Mechanism of Bond Behavior of Concrete Beams Strengthened with Near-Surface-Mounted CFRP Rods
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Mechanism of Bond Behavior of Concrete Beams Strengthened with Near-Surface-Mounted CFRP Rods

机译：CFRP棒加固混凝土梁粘结性能的机理。

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摘要

Bond tests were conducted on concrete beams strengthened with near-surface-mounted (NSM) nonprestressed and prestressed carbon fiber-reinforced polymer (CFRP) rods under static loading. In the NSM technique, the CFRP rods are placed inside precut grooves and bonded to the concrete with epoxy adhesive. Six concrete beams were tested. The test variables included presence of internal tension steel reinforcement (unreinforced and reinforced), use of NSM CFRP strengthening (nonprestressed and prestressed), and type of CFRP rod (spirally wound and sand blasted). The beams were tested statically in four-point bending. Based on the test results, the transfer length for the prestressed CFRP rod in epoxied groove was 150 and 210 mm for the sand blasted and spirally wound rods, respectively. The main failure mode was debonding between the CFRP rod and the epoxy that starts at sections close to the midspan then, as the load increases, it propagates toward the supports. At failure, the beams strengthened with a given rod type showed the same CFRP strain at sections close to the support (29% of ultimate strain for spirally wound bars and 39% of ultimate strain for sand blasted bars). A cracked section analysis was carried out and compared well with the measured results.
机译：在静态载荷下，对用近表面安装（NSM）非预应力和预应力碳纤维增强聚合物（CFRP）杆加固的混凝土梁进行了粘结试验。在NSM技术中，将CFRP杆放置在预切槽内，并用环氧胶将其粘结到混凝土上。测试了六个混凝土梁。测试变量包括内部受拉钢筋的存在（未增强和增强），使用NSM CFRP增强（未预应力和预应力）以及CFRP杆的类型（螺旋缠绕和喷砂）。在四点弯曲中对梁进行了静态测试。根据测试结果，喷砂和螺旋缠绕杆的预应力CFRP杆在环氧槽中的传输长度分别为150和210 mm。主要的破坏模式是CFRP杆和环氧树脂之间的剥离，该剥离从靠近中跨的部分开始，然后，随着载荷的增加，它会向支撑处传播。破坏时，用给定杆类型加固的梁在靠近支撑的截面处显示相同的CFRP应变（螺旋缠绕钢筋为29％极限应变，喷砂钢筋为39％极限应变）。进行了裂纹断面分析，并将其与测量结果进行了很好的比较。

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