Based on the vibration testing principle, and taking the local vibration of steel tube at the interface separation area as the
study object, a real-time monitoring and the damage detection method of the interface separation of concrete-filled steel
tube by accelerometer array through quantitative transient self-excitation is proposed. The accelerometers are arranged
on the steel tube area with or without void respectively, and the signals of accelerometers are collected at the same time
and compared under different transient excitation points. The results show that compared with the signal of compact
area, the peak value of accelerometer signal at void area increases and attenuation speed slows down obviously, and the
spectrum peaks of the void area are much more and disordered and the amplitude increases obviously. whether the input
point of transient excitation is on void area or not is irrelevant with qualitative identification results. So the qualitative
identification of the interface separation of concrete-filled steel tube based on the signal of acceleration transducer is
feasible and valid.
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