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为了改善FRP与混凝土之间的黏结效果,一种新型的表面黏贴FRP与机械锚固联合加固技术,即FRP-螺栓联合加固技术被提出,结合在役钢筋混凝土桥梁的损伤特点,分别采用传统的表面黏贴FRP桥梁加固技术与FRP-螺栓联合加固技术对试验梁的抗弯性能进行了详细的室内对比试验研究,对两种加固方式下的完整试验梁和预裂试验梁的试验结果进行了比较,分析了预裂度对加固效果的影响.结果表明:FRP-螺栓联合加固技术是一种更加可靠的桥梁加固方法,能够提高正截面的抗弯承载能力40%;螺栓预紧锚固FRP能够很好地抑制FRP在混凝土表面的剥离,有效提高FRP与混凝土表面之间黏结力.
In order to improve the bonding between FRP and concrete, a new type of surface-bonded FRP and mechanical anchoring combined reinforcement technology, namely FRP-bolt joint reinforcement technology, is proposed. Combined with the damage characteristics of existing reinforced concrete bridges, The surface-bonded FRP bridge reinforcement technology and the FRP-bolt joint reinforcement technology are used to conduct a detailed indoor comparison study on the flexural behavior of the test beam. The test results of the complete test beam and the pre-cracked test beam under two reinforcement methods The results show that FRP-bolt combined reinforcement technology is a more reliable bridge reinforcement method, which can improve the flexural capacity of normal section by 40%. The bolt pre-tensioned FRP can be It can effectively prevent the FRP peeling on the concrete surface and effectively improve the adhesion between the FRP and the concrete surface.