Damage Assessment in Railway Sub-structures Deteriorated Using Ae Technique

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.