Study on Detection of Composite Slab Interface Defects Based on Improved Time Reversal Method
Some defects such as voids and cracks might occur at the composite interface in the concrete casting process of composite slabs,reducing the component's overall reliability and compromising the structural safety.This study investigates the application of an improved time-reversal method based on Lamb waves for detecting interface defects in composite slabs,specifically in a reinforced truss concrete composite slab model.Firstly,the operating conditions of the model were determined,and an effective signal extraction method and damage indicators were proposed based on the defect model's operational status.Subsequently,defects of varying depths were set,and the focusing signals were compared and analyzed to identify the extent of the damage.The research demonstrates a significant correlation and sensitivity between the established damage indicators and the preset defect depths.Moreover,this method can accurately identify the location and se-verity of interface defects in composite slabs,showing promising engineering application prospects.
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