3D Modeling-Providence Viaduct
Temporary Ramp Bridge (Ramp AC-AD)
Providence, Rhode island
Steere Engineering utilized 3D modeling for coordination of a temporary vehicular ramp bridge as part of the Providence Viaduct Replacement. Scheduling of the ramp opening was critical to the success of the project. Delays in the opening would have caused significant scheduling issues and major setbacks to the contractor.
The temporary ramp bridge is a combination of prefabricated bridges, structural steel support framing and accelerated bridge construction. The structure consists of a 4 span, 332’ prefabricated Mabey Truss Bridge and an additional 6 spans of prefabricated bridge units (PBU’s). The PBU’s are directly supported by a framework of structural steel carry beams spanning from support to support. The carry beams and the trusses are supported on a series of steel bent towers. Due to the criticality of the structure, Steere constructed the bridge in 3D using shop drawing submittals to ensure coordination between the various bridge elements.
These elements consisted of all the bridge related components including; steel carry beam framing, precast bridge units (deck and stringers), steel bent towers, tower cap beams, bridge bearings, detailing of steel shim plates to accommodate cross slopes in two directions, bolt down precast barrier alignment on deck panels with leading/trailing railing transition details, confirmation of proposed roadway grades and corresponding asphalt depths, bridge joint assemblies between temporary ramp and tie in at permanent ramp and joint details at prefabricated truss and PBU bridge spans.
By constructing the bridge in 3D, conflicts and coordination issues were resolved ahead of time ensuring proper fit-up in the field. This avoided costly delays which could have occurred if the various pieces had been fabricated and shipped to the job site.
OWNER: ConDOT/Norther Construction Service
DESIGN COMPLETION: 2013
REFERENCE: Mr. Kenneth E. Fragnoli, P.E., Assistant District Manager
CONSTRUCTION COMPLETION: 2014
PROJECT COST: $8 Million