|Table of Contents|

Wire breakage monitoring method for cable-stayed bridge cable using magnetic gradient tensor(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2022年4期
Page:
52-62
Research Field:
桥梁与隧道工程
Publishing date:

Info

Title:
Wire breakage monitoring method for cable-stayed bridge cable using magnetic gradient tensor
Author(s):
JIANG Sheng-hua1;  SUN Wei-he1;  WANG Hao1;  LIU Xiao-chun2
(1. College of Engineering and Technology, Southwest University, Chongqing 400715, China; 2. School of Civil Engineering, Central South University, Changsha 410075, Hunan, China)
Keywords:
bridge engineering;  cable-stayed bridge;  wire breakage;  monitoring;  magnetic gradient tensor;  location of wire breakage;  number of broken wires
PACS:
U448.27
DOI:
10.19721/j.cnki.1671-8879.2022.04.006
Abstract:
In order to study the monitoring method of location and number of cable wire breakage for cable-stayed bridge and eliminate the interference of environmental magnetic field, the monitoring method of wire breakage based on magnetic gradient tensor was proposed. The monitoring device for wire breakage was developed, including magnetic field sensing system and motion control system. The motion control device was assembled with non-magnetic materials such as aluminum alloy and copper connector, so as to eliminate magnetic interference in the experimental device to a great extent. The magnetic field intensity, magnetic gradient and partial modulus were analyzed for a single cable wire and a bundle of cable wire before and after wire breakage. The relationship between the magnetic gradient, partial modulus and the number of broken wires was studied. The results show that the ratio of environmental magnetic field intensity to single cable wire's magnetic field intensity is 98.47% to 157.76%, so the influence of environmental magnetic field intensity cannot be ignored. The ratio of environmental magnetic gradient(partial modulus)to single cable wire's is 3.34% to 6.67%, so it can be ignored. The environmental magnetic gradient and partial modulus are far less than those of the cable wire. When a single wire and a whole bundle of cable wire are broken, the magnetic gradient and partial modulus curves change suddenly at the broken region, including crest or trough, etc. The number of broken wires in the whole bundle of cables is related to the magnetic characteristic parameters such as the depth and width of curve crest(or trough)and the area surrounded by abrupt changes. Location of wire breakage measured by magnetic characteristic parameters is 300.75 mm, and the error is 0.25% compared with the actual location of wire breakage of 300 mm. Compared two broken wires with one broken wire, the ratio of crest or trough's average depth is 1.82, the ratio of crest or trough's average width is 1.07, the ratio of average area surrounded by the mutation is 1.95. The area surrounded by the mutation is more effective as an evaluation index for the number of broken wires.6 tabs, 14 figs, 27 refs.

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Last Update: 2022-07-20