摘要
为实现大体积桥梁主缆体系的精确断丝无损检测,采用COMSOL有限元软件建立了漏磁仿真模型,基于自发漏磁效应进行了试验研究,并分析了不同断丝宽度和断丝数目的磁场变化规律。通过分析可知,有限元仿真结果与试验结果基本一致,除去背景场后磁通密度信号明显增强,证明了主缆断丝检测方法的有效性和灵敏性;断丝信号峰谷值随着断丝数目的增加而增大,同时信号的波谷间距也随着断丝宽度的增大而增加。基于自发漏磁效应的主缆断丝检测方法可以较好地发现缆索的细微断丝情况,为桥梁主缆体系无损检测提供了参考。
In order to realize accurate non-destructive detection of broken wire of main cable system of large bridge,the magnetic leakage simulation model was established by finite element software of COMSOL to analyze magnetic field variation law with different broken wire widths and numbers.The results show that results by the finite element simulation are basically in agreement with the experiment ones.And the magnetic flux signal is significantly enhanced after removing the background field,which proves the effectiveness and sensitivity of the broken wire detection method of the main cable;The peak-valley value increase with the increase of broken wire numbers.The valley distance of broken strand increases with the increase of broken wire widths;Therefore,the broken wire detection method of the main cable based on the spontaneous magnetic leakage effect can effectively find the microbreak,which provide reference for the nondestructive testing of the bridge main cable system.
作者
马帅飞
林阳子
江东
梅雪菲
Ma Shuaifeil;Lin Yangzi;Jiang Dong;Mei Xuefei(Beijing CCCC Qiaoyu Science and Technology Co.,Ltd.,Beijing 100000,China;Guangzhou Cable Bridge Engineering Co.,Ltd.,Guangzhou 518000,China)
出处
《市政技术》
2023年第6期76-81,共6页
Journal of Municipal Technology
关键词
主缆
断丝检测
自发漏磁效应
有限元仿真
main cable
broken wire detection
spontaneous magnetic leakage effect
finite element simulation
