Investigating the Mechanical Properties and Temperature Compensation of a Spot-Welded Strain Sensor within an Intelligent Steel Strand Cable
Nianchun Deng, Lehai Hu, Xin Liu, Zhiyu Tang
TL;DR
This paper introduces a new strain sensor for steel cables that can be spot-welded without damaging the structure and works well for long-term tension monitoring.
Contribution
A novel chip-based spot-welded strain sensor for intelligent steel strand cables with high strain transfer efficiency and low temperature sensitivity.
Findings
The strain transfer efficiency of the sensor exceeded 96% in simulations.
Experimental load-strain fitting reached a degree of 0.999 with tension errors under 1.26%.
Temperature-induced tension errors were within 1.0%, and sensor accuracy improved after relaxation.
Abstract
According to current regulations, welding is strictly prohibited for prestressed and tension cables. In response, this article proposes the use of a portable spot-welding machine to spot weld steel strands. This method generates a small current during spot welding, with a voltage of only 3 V to 5 V, and does not damage the internal structure of the steel strand. To effectively monitor cable tension in cable-supported structures, a novel approach utilizing a chip-based, encapsulated spot-welded strain sensor was investigated. The strain sensing capability, temperature sensitivity, stress relaxation, and static load responses were investigated on the proposed smart steel strand cables with spot-welded strain sensors. The theoretical analyses and finite element simulations revealed that the strain transfer efficiency of the spot-welded strain sensor exceeded 96%. The experimental results…
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Taxonomy
TopicsStructural Health Monitoring Techniques · Mechanical stress and fatigue analysis · Concrete Corrosion and Durability