Ultrasonic Testing Method for Through-deck Cracks in Steel Bridge Decks Based on Penetration Signals
This study proposes a method for detecting through-deck cracks in steel bridge decks based on ultrasonic penetration signals,aiming to enhance the accuracy and efficiency of hidden crack detection in existing bridges.The propagation mechanism of ultrasonic waves in cracked decks was studied by the finite element method.The variation law of different crack parameters and received signal strength was analyzed.The feasibility and reliability of the detection method were further verified by a through-wall crack detection test.The recommended detection parameters are wafer side length of 4mm,excitation frequency of 5MH,and K value of 0.8.When the crack width is less than 0.1 mm,the influence of the crack width can be ignored,otherwise the crack width can be judged by reflection signal.The penetration signal is inversely related to crack depth.The incident coordinates at maximum restoration value are linearly related to crack depth with a error within 1 mm.The ultrasonic detection method based on penetration signals,with the incident coordinates at maximum restoration value as the primary indicator,can effectively achieve through-deck crack detection in steel bridge decks.
bridge and tunnel engineeringsteel bridge deckthrough-deck crackspenetration methodultrasonic testing
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