Xiaokun Guo∗ and Heng Yan∗∗
Eddy current thermal imaging, CFST, void detection, influencefactors
Based on the principle of eddy current thermal imaging, a void detection test for concrete-filled steel tube (CFST) specimens was performed. The effects of the void thickness, steel tube wall thick- ness, heating power, and heating time were analysed experimen- tally. A model relating the heating rate and the influence factors was established to determine the sensitivity of the heating rate to the influence factors with multiple linear regression analysis. The following results are obtained: (1) The heating rate had positive linear relationships with the stripping thickness and heating power, and the heating rate had a negative linear correlation with the wall thickness. (2) An equation relating the heating rate with the strip- ping thickness, steel tube wall thickness, heating power, and heating time was obtained. The steel tube wall thickness and the heating power had the greatest influence on the heating rate. The results of this study can promote the application of eddy current thermal imaging technology and provide support for the development of void detection technology of CFST arch bridges.
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