Steel Truss Bridge Redundancy Combined with Construction over a Busy Rail Yard

摘要

The St. Anthony Parkway steel truss bridge replacement project, located in Minneapolis, Minnesota,USA, and crossing over the BNSF Northtown rail yard, incorporates unique load path and internal redundancymeasures including eliminating fracture critical steel truss members and gusset plates and using a post-tensionedconcrete bottom chord. The replacement of the existing truss spans will require specialized constructiontechniques to minimize impacts to BNSF’s heavily used rail yard including launching beams to remove the existingtrusses and install the new truss span.