Abstract
In this paper, the authors propose the use of acoustic emission (AE) techniques for the efficient maintenance of railway structures. They investigate the characteristics of secondary AE induced by train loading and describe how experiments were conducted using model piles and in-situ AE monitoring of in-service railway bridges. Results show that the proposed method is suitable enough for detecting invisible defects. Based on the results of the in-situ AE monitoring, the authors propose a new index known as RTRI (the ratio of Repeated Train load at the onset of AE activity to Relative maximum load for Inspection period).
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