ODOT planned a large interstate rehabilitation project in Dayton. Our team performed bridge design, survey, bridge inspection, roadway design, and maintenance of traffic (MOT) for this interchange of two interstate highways over two railroad crossings. Our bridge engineers completed the deck replacement, steel superstructure inspection, and rehabilitations for three ramps. For the fourth ramp, we completed the deck, superstructure replacement, and substructure rehabilitations. In addition, our team developed a complex Maintenance of Traffic Alternatives Analysis (MOTAA) with significant coordination with other on-going projects to prepare a staged construction schedule and complex MOT for various stages.
The three ramps with deck replacement range in size from 11- to 14-foot span/multi units continuous steel plate girders, with the longest structure being 1,154 feet. The superstructure replacement for the fourth ramp is a 12-span/3 units plate girder and rolled beam bridge over the CSXT and Norfolk Southern Railroads. Other unique aspects of this project include the gore area, which required complex framing and associated 2D finite element analysis for design and detailing as well as complex MOT phasing.
Innovative design and plan details were developed for improving the shear capacity of pier caps by means of reinforced encasements, flexural capacity of stems of T-type by concrete encasement and doweling into existing stem and increased the flexural capacity of bottom reinforcement by adding topping slab and developing composite action with existing footing. The rehabilitation developed reduced project duration and construction cost compared to total replacement of T-type piers with flexural overstress.
