LUC-280-1.64

CSX Transportation Bridge over I-280

As part of the LUC-280-1.64 project, a new railroad bridge was designed, consisting of two simple spans (107’-3” and 115’-6” c/c bearings). Steel through girders with a ballasted deck and reinforced concrete abutments and pier supported on spread footings with piling comprised the proposed structure. This structure was designed and built utilizing part-width construction. Traffic was maintained on a temporary run-around bridge while the new bridge was built. The necessary plan details for part-width construction were developed for the abutments, pier, and adjoining retaining walls. Another complication in the design resulted from the 53 degree skew. Careful thought and attention to detail was required when performing the design calculations for the structural steel deck.

I-280 over Starr Avenue

As part of the LUC-280-1.64 project, a new bridge was constructed over Starr Avenue. Since this project was constructed under traffic, part-width construction details were provided in the plans – the most notable feature was that the existing abutments were incorporated into the proposed design. A wider roadway necessitated lengthening the abutments and providing turned-back wingwalls to accommodate the proposed geometrics. A new single span (82’-5.5” c/c bearing) steel girder superstructure with a composite, reinforced concrete deck supported on the modified reinforced concrete wall abutments supported on piling was designed.