Due to earthquakes, differential settlement and long-term weathering, civil structures have sustained deterioration. In super-structures located above ground, except for seriously damaged structures, evaluation of moderately or intermediately damaged structures is difficult. In sub-structures the damage would not be readily assessed even for severely damaged structures. AE testing has a potential to evaluate thus damages not only for super-structures but sub-structures since it is a monitoring technique to detect fracture-associated elastic waves. In the present paper, damage indices using AE activity is discussed with actually damaged concrete piers. Railway traffic is utilized to induce AE activity. Through in-situ monitoring, it can be concluded that AE monitoring is a promising technique to quantify the damages in the railway structures. In RTRI and Calm ratio, obtained from AE activity with reference to structural deformation, they were strongly dependent both on the definition of loading processes, namely loading and unloading, and an AE parameter employed. Thus, much more applications with a variety of fracture types and levels should be needed to clarify the applicability as a damage index. It was difficult to associate damage levels with AE peak amplitudes, the peak amplitude distribution showed characteristic trends depending on the damage levels, in especial, improved b-value, showing a gradient of the distribution, would be a promising parameter providing damage degree quantitatively.
Damage assessment in railway sub-structures deteriorated using AE technique
Schadensbewertung in geschädigten Eisenbahnstrukturen mittels Schallemission
2004
8 Seiten, 12 Bilder, 10 Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
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