CFRP在水工钢闸门修复中的应用研究

Application of CFRP in repairing hydraulic steel gate

为解决水利工程中常用水工钢闸门的锈蚀问题,针对粘钢加固技术存在的闸门加固部位更易锈蚀、加固部位易产生应力集中等问题,充分发挥纤维增强复合材料(FRP)比强度高、耐腐蚀性好、不改变母材特性等优点,提出采用CFRP修复的方法。首先采用与试验结果对比的方式验证数值方法分析CFRP修复的可行性和正确性,然后采用数值方法对某水工钢闸门在未锈蚀、锈蚀和CFRP修复三种状态下的强度和刚度进行分析。分别采用改变单元厚度法和共结点重单元法对锈蚀和CFRP修复的闸门模型进行数值模拟。结果表明:以未锈蚀闸门的计算结果为基值,主横梁腹板、支臂腹板和面板中下部发生2 mm锈蚀时,主梁、支臂、面板的强度和刚度分别降低25.95%和23.73%、25.52%和24.24%、24.43%和25.00%。采用单层厚0.167 mm的CFRP修复后,主梁、支臂、面板的强度和刚度分别提高30.28%和26.43%、29.46%和24.53%、28.47%和29.87%。采用CFRP修复加固水工钢闸门具有明显的效果,研究成果可为闸门规范的修订完善和实际工程中采用CFRP修复提供理论依据。

In view of the problems existing in the reinforcement technology of glued steel, such as the gate reinforcement part is easy to rust, and the reinforcement part is easy to produce stress concentration, etc., aiming at solving the corrosion problem of hydraulic steel gates, CFRP repair method is proposed fully exerting the advantages of fiber reinforced composite(FRP) such as high specific strength, good corrosion resistance, and not changing the characteristics of the base metal. Firstly, the feasibility and correctness of CFRP repair are validated by comparing the numerical method with the experimental results. Then, the strength and stiffness of a hydraulic steel gate under three states of non-rust, rust and CFRP repair are analyzed by numerical method. The gate models of corrosion and CFRP repair were simulated by changing element thickness method and common node coincidence element method respectively. The results show that the strength and stiffness of the girder, the arm and the plate are reduced by 25.95%、23.73%, 25.52%、24.24%, 24.43%、25.00% respectively when the web of the main girder, the web of the gate arm and the middle and lower part of the plate are corroded by 2 mm based on the calculation results of the non-rusted gate. After repairing with CFRP with a single layer thickness of 0.167 mm, the strength and stiffness of the main girder, the gate arm and the plate increased by 30.28%、26.43%, 29.46%、24.53%, 28.47%、 29.87% respectively. It can be seen that CFRP has obvious effect in repairing and reinforcing hydraulic steel gates, which can provide theoretical basis for revising and perfecting gate codes and applying CFRP in practical projects.