Experiment on interface separation detection of concrete-filled steel tubular arch bridge using accelerometer array

摘要

The interface separation between the steel tube and the filled-concrete would reduce tremendously the bearing capacity of the concrete-filled steel tubular arch bridge. It is almost impossible to be detected fromvisual inspection, and there is no efficient method to monitor so far, thus it is a great engineering problem that should be figured out desperately for the sake of safety. In this paper, we proposed a vibration test method of the local mode: distributed accelerometer array is deployed along the tube, and then it is used to record the vibration signal induced by quantitative excitation via telecontrol; at last, the position and size of separation could be determined through the analysis of acquired data. The verified experiment showed that the frequency and amplitude of the signal could represent the state of separation; therefore, we can identify and localize the separation accurately and efficiently.