Three defective ASTM A 514 steel splice plates were discovered on the I-275 Combs-Hehl twin bridges over the Ohio River. A follow-on in-depth field inspection of 1,356 A 514 steel plates on the bridges revealed 14 additional defective gusset and splice plates. The A 514 steel was improperly heat-treated resulting in a brittle crack-prone microstructure. Ultrasonic and impact hardness tests were used to identify the defective steel. Subsequently, the defective steel plates were either removed or lapped with additional steel plates.
Digital Object Identifier
Hopwood, Theodore II and Palle, Sudhir, "Nondestructive Testing of Defective ASTM A 514 Steel on the I ‐ 275 Combs‐Hehl Twin Bridges over the Ohio River in Campbell County, Kentucky" (2010). Kentucky Transportation Center Research Report. 54.