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Structural Monitoring and Maintenance
  Volume 10, Number 3, September 2023 , pages 261-281
DOI: https://doi.org/10.12989/smm.2023.10.3.261
 

Force monitoring of Galfan cables in a long-span cable-truss string-support system based on the magnetic flux method
Yuxin Zhang, Xiang Tian, Juwei Xia and Hexin Zhang

 
Abstract
    Magnetic flux sensors are commonly used in monitoring the cable force, but the application of the sensors in large diameter non-closed Galfan cables, as those adopted in Yueqing Gymnasium which is located in Yueqing City, Zhejiang Province, China and is the largest span hybrid space structure in the world, is seldom done in engineering. Based on the construction of Yueqing Gymnasium, this paper studies the cable tension monitoring using the magnetic flux method across two stages, namely, the pre-calibration stage before the cable leaves the rigging factory and the field tension formation stage of the cable system. In the pre-calibration stage in the cable factory, a series of 1:1 full-scale comparative tests were carried out to study the feasibility and relability of this kind of monitoring method, and the influence on the monitoring results of charging and discharging voltage, sensor location, cable diameter and fitting method were also studied. Some meaningful conclusions were obtained. On this basis, the real-time cable tension monitoring system of the structure based on the magnetic flux method is established. During the construction process, the monitoring results of the cables are in good agreement with the data of the on-site pressure gauge. The work of this paper will provide a useful reference for cable force monitoring in the construction process of long-span spatial structures.
 
Key Words
    cable tension monitoring; cable-truss string-support system; Galfan cable; long-span spatial structures; magnetic flux sensor
 
Address
Yuxin Zhang and Xiang Tian: School of Civil Engineering, Shanghai Normal University, Shanghai 201418, China
Juwei Xia: Space Structures Research Center, Zhejiang University, Hangzhou 310027, China
Hexin Zhang: School of Computing, Engineering and the Built Environment, Edinburgh Napier University, Edinburgh EH10 5DT, Scotland, UK
 

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