Study on Simplified Calculation of Ultrasonic Method for Detecting Void in Concrete Filled Steel Tube Based on Sound Velocity

Abstract

Arch rib is the key mechanical component of concrete-filled steel tubular arch bridge. It is of great engineering value to detect the void of arch rib efficiently and accurately. Aiming at the problem that the ultrasonic method can not realize the quantitative detection of the void height of the arch rib, a simplified calculation formula for the detection of the void height of concrete-filled steel tubular by the ultrasonic method based on the speed of sound is derived and established by combining the theoretical derivation, the model experiment and the real bridge experiment. The feasibility and accuracy of the calculation formula are verified by the model experiment and the real bridge experiment. The results show that the simplified calculation for the detection of the void height of concrete-filled steel tubular by the ultrasonic method based on the speed of sound has high accuracy, which can be used for the discrimination of the void condition of concrete-filled steel tubular and the simplified calculation of the void height, and provides a theoretical basis for the quantitative evaluation of the void height of concrete-filled steel tubular arch rib.