碳纤维布加固线杆稳定性与机理研究

Study on Stability and Mechanism of Reinforced Wire Rod with Carbon Fiber Cloth

针对大峡水电站开关站内线杆经过长时间的服役,承载能力有所降低这一情况,对站内线杆进行整体加固具有重要的现实意义。文章选用站内220kV的直线杆作为研究对象,通过PFC软件模拟对线杆在未加固与碳纤维复合材料(FRP)加固后的承压性能进行了系统研究。结果表明,相较于未加固线杆,FRP加固线杆的强度提高了1.69至2.50倍,FRP加固线杆在承压过程中的应变分布更加均匀,而未加固线杆的应变最大值出现在线杆中上部,其稳定性明显弱于FRP加固线杆。此外文章对不同FRP加固层数进行研究,结果表明,单层加固下的线杆强度增加量最大,而随着加固层数的增加,对线杆强度的提升效果并不明显。该研究可为相关线杆加固工程提供参考。

In view of the situation that the bearing capacity of the inner pole of Daxia Hydropower station has been reduced after a long time of service,it is of great practical significance to strengthen the whole inner pole of the station.In this paper,the 220 kV linear rod in the station is selected as the research object,and the pressure bearing performance of the rod without reinforcement and reinforced with carbon fiber composite material(FRP)is systematically studied by using PFC software.The results show that the strength of FRP reinforced wire rod is increased by 1.69 to 2.50 times compared with unreinforced wire rod.The strain distribution of FRP reinforced wire rod is more uniform in the process of bearing pressure,while the maximum strain of unreinforced wire rod appears in the middle and upper part of the wire rod,and its stability is obviously weaker than that of FRP reinforced wire rod.In addition,this paper studies the number of different FRP reinforced layers,and the results show that the strength of the pole under single-layer reinforcement increases the most,but with the increase of the number of reinforced layers,the effect on the strength of the pole is not obvious.The research can provide some reference value for the related pole reinforcement project.