The cable force in arch bridge hangers is a critical indicator of structural safety. However, due to the structural characteristics of grouted steel-sleeved hangers, conventional monitoring methods such as the frequency-based method, pressure sensor method, and fiber Bragg grating (FBG) method are often inadequate for accurate measurement on such bridge structures. To address this challenge, a detection solution based on magnetoelastic effect sensors was proposed and validated for applying the magnetoelastic effect to these complex structures. The effectiveness of the magnetoelastic method was investigated through theoretical analysis of sensor measurement, magnetic simulations, and laboratory calibration. For the first time, the attenuation effect of steel sleeve thickness on the internal magnetic field was quantitatively revealed. Through laboratory static load tests, it was found that the presence of steel sheaths can reduce the full-scale error of the designed magnetic flux cable force sensor from 2.12% to 4.48%, but still within the engineering standard range of 5%. In engineering applications, the magnetic flux sensor has good measurement repeatability, with a measurement standard deviation range of 11.94~31.3 kN. The measured cable force of the suspension rod shows an increasing trend from the edge to the inside, which is consistent with the normal distribution law of cable force of the arch bridge suspension rod. The results verified the effectiveness and advantages of the magnetic flux method in detecting the tension of large-diameter steel sheathed suspension rods, providing engineering practice reference for health monitoring of similar bridges.
LIN Ju-feng, WANG Xiao-lin, ZHU Mao-hua, ZHOU Ji, YIN Chao-neng, ZHAO Jing-zhao, FANG Yan-qiang.
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Science Technology and Engineering, 2026, 26(17): 7334-7343 DOI:10.12404/j.issn.1671-1815.2504698
在吊杆桥梁体系中,由于长吊杆的弹性变形能力大于短吊杆,在交变荷载的长期作用下,受力较大的短吊杆将先于长吊杆达到疲劳极限,这使得出现断裂的往往是边缘两侧的短吊杆,所以短吊杆的受力情况更应该被密切关注[25]。此次测量选取主桥行车系外侧六组短吊杆作为关键监测对象,短吊杆钢护套外径为219 mm, 长度最短为4.14 m,最高为9.73 m。是典型的高刚度短吊杆。由于待测短吊杆是在役吊杆,需要将设计好的传感器结构在线绕制在吊杆上,通过信号传输线路将传感器的输出接入上位机机箱内,对吊杆索力进行实时监测,如图9所示。
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