Abstract
Condition assessment of cables has gained considerable attention for the bridge safety. A magnetic flux leakage and magnetostrictive guided wave hybrid transducer is provided to inspect bridge cables. The similarities and differences between the two methods are investigated. The hybrid transducer for bridge cables consists of an aluminum framework, climbing modules, embedded magnetizers and a ribbon coil. The static axial magnetic field provided by the magnetizers meets the needs of the magnetic flux leakage testing and the magnetostrictive guided wave testing. The magnetizers also provide the attraction for the climbing modules. In the magnetic flux leakage testing for the free length of cable, the coil induces the axial leakage magnetic field. In the magnetostrictive guided wave testing for the anchorage zone, the coil provides a pulse high power variational magnetic field for generating guided waves; the coil induces the magnetic field variation for receiving guided waves. The experimental results show that the transducer with the corresponding inspection system could be applied to detect the broken wires in the free length and in the anchorage zone of bridge cables.
Highlights
The common aspect of many long span bridges, such as suspension bridges, cable-stayed bridges and steel arch bridges, is that the cables are the primary load-carrying members [1]
Based on the requirement of the cable testing and the principles of magnetic flux leakage (MFL) and magnetostrictive guided wave (MGW) testing, a hybrid transducer for detecting bridge cables is provided in this study
The basic principle of MFL testing is that the flux lines pass through the steel wires when a magnetic field is applied to the cable
Summary
The common aspect of many long span bridges, such as suspension bridges, cable-stayed bridges and steel arch bridges, is that the cables are the primary load-carrying members [1]. The anchorage zone has more severe corrosion problems than the free length [2]. Another reason for deterioration of cables is fatigue. Only the flawed cables need to be replaced based on testing results and unnecessary costs can be avoided. The localized measurement limits its application and only flaws in the free length of cable can be detected. It is impossible to detect the anchorage zone by MFL testing. In order to evaluate the well-being of cables, both the free length of cable and the anchorage zones need to be examined. Based on the requirement of the cable testing and the principles of MFL and MGW testing, a hybrid transducer for detecting bridge cables is provided in this study.
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