玻璃纤维增强聚合物(GFRP)锚杆是一种新型的高性能非金属锚杆,更轻的重量,更好的耐腐蚀性,和一个比钢筋更低的成本。因此,探索GFRP锚固系统的耐久性和粘结性能对防护工程的结构设计具有重要意义,尤其是在沿海环境中。然而,对GFRP树脂螺栓在海水条件下的耐久性研究不足,对GFRP螺栓的拔出测试没有通用标准。为研究GFRP树脂螺栓的耐久性和粘结性能,在这项工作中,使用人工海水进行了耐久性实验,拉拔试验是使用具有不同抗压强度(21.2、40.8和61.3MPa)的大型混凝土平台进行的。耐久性实验结果表明,GFRP棒和环氧树脂材料在人工海水环境中的强度变化小于5%。随后,使用填充有环氧树脂的钢管进行室内拉拔试验,测试结果表明了一个临界锚长度值。还对嵌入大型混凝土砌块中的GFRP树脂螺栓进行了不同强度的拉拔试验。根据测试结果,嵌入三个抗压强度不同的混凝土砌块中的所有GFRP树脂螺栓均表现出杆状断裂破坏。由于树脂和杆之间的高结合强度,破坏模式不受混凝土块抗压强度的控制。以及树脂和混凝土之间。因此,这种GFRP树脂锚固系统可以充分利用GFRP杆的抗拉强度。这项研究对验证GFRP树脂螺栓在腐蚀性海洋环境中的安全性和可靠性具有重要的实用价值,促进了GFRP材料在工程领域的应用和发展,为GFRP螺栓的结构设计和进一步研究提供了有价值的参考。
Glass fiber-reinforced polymer (GFRP) anchor bolts are a new type of high-performance nonmetallic anchor with significantly higher tensile strength, a lighter weight, better corrosion resistance, and a lower cost than steel bars. Therefore, exploring the durability and bonding performance of GFRP anchor systems is of great importance for the structural design of protective engineering, especially in coastal environments. However, insufficient research has been conducted on the durability of GFRP resin bolts in
seawater conditions, with no universal standard on the pullout testing of GFRP bolts. To
study the durability and bonding performance of GFRP resin bolts, durability experiments were conducted in this work using artificial
seawater, and the pullout tests were conducted using a large-scale concrete platform with different compressive strengths (21.2, 40.8, and 61.3 MPa). The results of the durability experiments indicated that the strength variations of the GFRP rods and epoxy resin materials in artificial
seawater environments were less than 5%. Subsequently, indoor pullout tests using steel tubes filled with epoxy resin were conducted, and the test results indicated a critical anchor length value. Pullout tests of the GFRP resin bolts embedded in large-scale concrete blocks were also conducted with different strengths. According to the test results, all GFRP resin bolts embedded in the three concrete blocks with different compressive strengths exhibited rod fracture failure. The failure mode was not controlled via the compressive strength of the concrete blocks due to the high bonding strength between the resin and the rod, as well as between the resin and the concrete. Therefore, this GFRP resin anchor system could fully utilize the tensile strength of GFRP rods. This research offers significant practical value in verifying the safety and reliability of GFRP resin bolts in corrosive marine service environments, and it contributes to the application and development of GFRP materials in the engineering field, serving as a valuable reference for the structural design and further
study of GFRP bolts.