钢箱梁受弯屈曲的磁记忆参数表征

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振动与冲击 ›› 2022, Vol. 41 ›› Issue (16) : 142-148.

论文

钢箱梁受弯屈曲的磁记忆参数表征

韦璐茜1，苏三庆2，王威2，严敏嘉1

作者信息 +

Characterization of buckling of a steel box girder under bending using parameter of magnetic memory

WEI Luxi1,SU Sanqing2,WANG Wei2,YAN Minjia1

Author information +

文章历史 +

摘要

为了探究金属磁记忆检测技术对桥梁钢构件屈曲部位的损伤预测，采用金属磁记忆技术检测了Q345qC四点受弯波纹腹板钢箱梁表面的磁场强度法向分量，提取磁表征量并对其与荷载之间的关系进行了分析。研究结果表明：金属磁记忆检测技术可用于对施工阶段桥梁钢构件表面的失稳监测，易屈曲位置可以通过磁表征量的变化规律反映。研究分析认为，易屈曲位置的磁表征量随荷载的变化呈现先上升，临近构件屈服时下降的规律。通过变化的规律性可以判别易屈曲位置，通过开始下降的时间可以对屈曲进行预警，防范灾害的发生。该研究为施工阶段钢结构的失稳监测提供了一种有效方法。
关键词：结构健康监测；屈曲参数表征；金属磁记忆；波纹腹板钢箱梁；无损检测

Abstract

To predict the buckling position of the bridge steel members, the metal magnetic memory technology (MMMT) was used. The normal component of magnetic field of steel box girder with corrugated web made of Q345qC was detected using MMMT. The magnetic characteristic was extracted, and the relation between the and load was analyzed. The results show that: MMMT can be used to monitor the surface of bridge steel members that are prone to buckling in construction stage，and the buckling position can be reflected by the change rule of . Analysis suggests that the of the vulnerable position rises first with the change of load and then drops before the component yields. The easy buckling position can be distinguished by the regularity of change, and by the time of the beginning of the descent, the buckling can be warned to prevent the occurrence of disasters. This study provides an effective method for the instability monitoring of steel structures during construction.
Keywords: Structural health monitoring; parameterized characterization of buckling; metal magnetic memory; steel box girder with corrugated web; nondestructive testing

导出引用

韦璐茜1，苏三庆2，王威2，严敏嘉1. 钢箱梁受弯屈曲的磁记忆参数表征[J]. 振动与冲击, 2022, 41(16): 142-148

WEI Luxi1,SU Sanqing2,WANG Wei2,YAN Minjia1. Characterization of buckling of a steel box girder under bending using parameter of magnetic memory[J]. Journal of Vibration and Shock, 2022, 41(16): 142-148

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