Acoustic emission from fissured steel plate deck of road bridge

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Acoustic emission from fissured steel plate deck of road bridge

Shigeishi, M. / Tomoda, Y. / Ogasawara, T. / Ito, T. / Tachibana, Y.

In recent years, the steel and concrete composite slabs have been increasingly adopted. However, inspections of the concrete condition of the composite slabs are relatively difficult task because the steel plates hide the concrete body. Therefore, establishment of an inspection method for this kind of structure is strongly demanded in current. The aim of this research is development of a non-destructive inspection method of the steel and concrete composite slab using acoustic emission technique. The acoustic emission measurements were implemented through wheel load running tests using an actual size Robinson type steel and concrete composite slab specimen. Moreover, the surfaces of the slabs were infiltrated after 400,000 times of the reciprocal running, the acoustic emission events due to water infiltration from the cracking of concrete were also observed. As the result, variations of acoustic emission activities and characteristics of the acoustic emission waveform parameters are recognized as fatigue progress. Otherwise, water saturation into the concrete from surface crack also could be detected changing the acoustic emission activity.