钢丝绳与碳纤维布加固钢筋混凝土梁的抗剪性能

Shear performance of reinforced concrete beams reinforced by the wire ropes and CFRP sheets

目前,我国的交通运输和建筑工程事业发展迅速,对既有钢筋混凝土梁的抗剪性能加固是旧桥加固与改造、既有建筑结构维修领域的重要研究课题,对改善在役结构的受力性能和减少安全事故具有重要意义。近年来,采用纤维增强高分子复合材料(FRP)对既有结构的加固,成为研究的热点,其加固方式主要有粘贴与锚固方式。与被动加固方式不同,钢丝绳加固技术是一种新的体外预应力加固方法,是利用钢丝绳主动施加预应力,对结构实施主动的加固。基于钢丝绳与碳纤维布加固两种方式,研究了影响两种加固方式的主要因素,对比了钢筋混凝土梁的抗剪加固效果,分别分析了钢丝绳的布置间距和布置方式,以及碳纤维布的层数和粘贴方式对抗剪加固效果的影响规律,并提出相应的工程建议。

At present, the transportation and contruction of china are developing rapidly, the shear performance re- inforcements of the existing reinforced concrete beams are the main research issue for the reinforcement and recon- struction of the old bridge, the maintenance of the building structure. After that, it could improve the labor force performance of the structures, reduce the accidents significantly. In recent years, the use of fiber reinforced poly- mer （FRP） composites to reinforce the existing structures become a focal point to research. The main methods of FRP reinforcement are divided the pasting and anchoring mode. The difference with passive reinforcement is that the wire ropes reinforcement technology is a new method, which used the vitro prestressed reinforcement to improve the shear capacity of the structures. Based on the wire ropes and carbon fibers reinforced polymer （CFRP） sheets reinforcement technology, the main factors effected the reinforcement are researched and ~ompared, such as the rope arrangement spacing, the layers and paste method of CFRP sheets. Finally, some proposals for the structure construction are put forward.