淡水环境中水工钢闸门与碳纤维布黏结性能研究

Bonding performance of hydraulic steel gate and carbon fiber cloth in freshwater environment

水工钢闸门长期频繁处在干湿交替状态,易发生金属腐蚀并降低结构的稳定性和承载性,碳纤维复合增强材料(CFRP)具有良好的抗腐蚀能力和抗拉能力,用作加固材料能延长闸门使用寿命,施工时保证CFRP与闸门之间的有效黏结是重难点。设计了9组CFRP与钢板黏结剪切试验,基于CFRP与钢板的黏结剪切破坏分析CFRP的黏结长度、钢板腐蚀程度以及黏结宽度等对有效黏结长度的影响。数据表明,CFRP与钢板的有效黏结长度是80 mm,且长度随钢板腐蚀程度加深而递减,与CFRP的粘贴宽度无关;CFRP与钢板的极限黏结力之间是线性增大关系,且当有效黏结长度低于实际粘贴长度时,极限黏结力不再动态变化。另外,试件所展现出黏结破坏的延性得到了一定的改善。

Hydraulic steel gate is in wet and dry alternation frequently and chronically, which can easily cause corrosion ofsteel and reduce the stability and load-carrying properties of steel gate. Carbon fiber reinforced composite （CFRP） can beused as reinforcing material to extend the service life of the gate due to its good corrosion resistance and tensile strength. It isimportant and difficult to guarantee the effective bonding between the carbon fiber cloth and the gate during construction. Wedesigned 9 groups of CFRP and steel plate bonding shear tests, studied the effect of the bond length of CFRP, the degree ofcorrosion of the steel plate, and the bond width on the effective length of the bond based on the bond shear failure of CFRP andsteel plate. The results show that the effective bond length between CFRP and steel plate is 80 mm, which decreases with theincrease of the corrosion degree of the steel plate, and is independent of the width of CFRP. The relationship between CFRP andthe ultimate bond force of steel plate is linear increase, and when the effective bonding length is lower than the actual bondinglength, the ultimate bonding force no longer changes dynamically. Moreover, the ductility of the bond failure shown by thespecimen could be improved.