DAMAGE DIAGNOSIS OF RAILWAY CONCRETE STRUCTURES BY MEANS OF ONE-DIMENSIONAL AE SOURCES

Damage of railway concrete structures has been evaluated using acoustic emission technique. In the technique quantitative assessments of damage can be conducted from three-dimensional (3D) AE activity induced by active live load with train passage. To obtain the 3D AE activity, however, it needs multiple AE sensors together with longer analysis time. In order to get the technique into widespread use, in this paper, linear AE source location, requiring two AE sensors, are applied for the damage evaluation. After comparison was made with 3D results it was concluded that the damage estimated by linear AE source location accorded well with those of 3D, and therefore the damage assessment of railway concrete structures can be reasonably evaluated using linear AE source location.