After the collapse of the 35W bridge in 2007 in Minnesota, state and federal agencies were in high alert and wanted to prevent another collapse. Bridges across the state were inspected for structural integrity and any impending failure signs. As a result, many bridges have since been replaced or substantially repaired.

AET was on the front lines of this initiative, inspecting the structural pins on numerous bridges throughout the State of Minnesota. These 3-4 inch diameter pins can be over two feet in length. Our Nondestructive Testing Group used ultrasonic testing to observe the pins for cracks that could lead to failure. Fortunately, we found very few issues and were able to alert MnDOT so officials could respond to potential problems expediently.

For more information about AET’s services for this project, visit our Nondestructive Testing page. ​