*Case 1.A [#g20254c7]
*Case 2.D [#g20254c7]
**The causes of fatigue [#w768f17a]
>
Welding defects were included at the time of fabrication. 
An inappropriate structural detail had been adopted. 
**Approaches to repairing and retrofitting [#t59204e8]
>
Removal of crack.

re-weld + post weld surface treatments 
>
**LINK [#n9482f93]

-[[Section L-2C]]
-[[Steel bridge on highway I-75, Georgia, USA]]
>
Grind out and Hole saw
Hole-drilling or welding, followed by Ultrasonic Impact Treatment (UIT)

-[[Gulf Outlet Br.]]
>
Crack removal
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