A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Smart cables for cable-stayed bridge
Despite of the increasing popularity of cable-stayed bridges, no accurate or simple method is available for directly measuring the stresses (forces) in the cable stays. The measurement of cable forces is important for monitoring excessive wind or traffic loadings, gauging the redistribution forces present after seismic events, and detecting corrosion via loss of the cross section. Magnetoelastic (EM) stress sensors function by utilizing the direct dependence of the magnetic properties of structural steels on the state of stress. These properties are measured by subjecting the steel to a pulsed or periodic magnetic field, which can be accomplished without any contact. Changes in magnetic flux in the steel allow those magnetic properties to be sensed and deduced through Faradays law. EM sensors can be designed for all sizes of prestressing steel cables and tendons. They are suitable for measuring quasi-static loads under any environmental conditions. The sensors can be embedded in concrete or fabricated in situ for exposed cables. The sensors are entirely suitable for sheathed cables and require no physical contact with the cable itself. The major contribution of this research is the development of a comprehensive testing procedure which can measure the stress in cable with a diameter of up to 250 (mm) from laboratory characterization of 7 (mm) wires or 0.6 (inch) strands. By installation of small number of 0.6 (inch) EM sensors inside the anchor of a cable in cable-stayed bridge, average cable stress and the stress in individual strand mounted with sensor are measured at will. Cable forces are known during construction and after construction has completed.
Smart cables for cable-stayed bridge
Despite of the increasing popularity of cable-stayed bridges, no accurate or simple method is available for directly measuring the stresses (forces) in the cable stays. The measurement of cable forces is important for monitoring excessive wind or traffic loadings, gauging the redistribution forces present after seismic events, and detecting corrosion via loss of the cross section. Magnetoelastic (EM) stress sensors function by utilizing the direct dependence of the magnetic properties of structural steels on the state of stress. These properties are measured by subjecting the steel to a pulsed or periodic magnetic field, which can be accomplished without any contact. Changes in magnetic flux in the steel allow those magnetic properties to be sensed and deduced through Faradays law. EM sensors can be designed for all sizes of prestressing steel cables and tendons. They are suitable for measuring quasi-static loads under any environmental conditions. The sensors can be embedded in concrete or fabricated in situ for exposed cables. The sensors are entirely suitable for sheathed cables and require no physical contact with the cable itself. The major contribution of this research is the development of a comprehensive testing procedure which can measure the stress in cable with a diameter of up to 250 (mm) from laboratory characterization of 7 (mm) wires or 0.6 (inch) strands. By installation of small number of 0.6 (inch) EM sensors inside the anchor of a cable in cable-stayed bridge, average cable stress and the stress in individual strand mounted with sensor are measured at will. Cable forces are known during construction and after construction has completed.
Smart cables for cable-stayed bridge
Intelligente Drahtseile für Drahtseilbrücken
Wang, M.L. (author) / Wang, G. (author) / Yim, J. (author)
2006
8 Seiten, 5 Bilder, 15 Quellen
Conference paper
Storage medium
English
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