Ultrasonic impact treatment for life extension of bridges with cracked and crack susceptible welded details
2006
ABSTRACT: This paper assesses the effectiveness of ultrasonic impact treatment (UIT) on
in-service bridge members. It presents the results of five years of acoustic emission (AE) monitoring of fatigue crack activity, both before and after UIT, at a large number of locations on a heavily
loaded, 30-year-old railway bridge with both cracked and crack susceptible welded details. Positive results were obtained in treating details both with and without active fatigue cracks, however
additional research is needed to determine the long term effectiveness of UIT as well as to develop
an optimum repair and treatment protocol for details with existing cracks.
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