Washington Bridge No. 700
Providence / East Providence, Rhode Island
Steere Engineering is providing structural design services to rehabilitate the westbound portion of the Washington Bridge, which carries I-195 between East Providence and Providence. Steere’s portion of the work included the pilot program for chloride extraction for RIDOT and FRP strengthening of the reinforced substructure and prestressed I-girders.
The Washington Bridge, originally constructed in 1969, is being rehabilitated due to the substantial concrete deterioration to the beam ends and substructure. The scope of work for the project includes elimination of deck joints, concrete repairs, FRP strengthening, and chloride extraction.
Steere is responsible for the evaluation report, rating, and design submission of Spans 15 through 18. Steere reviewed RIDOT’s existing plans and reports, and also provided finite element modeling services of the existing bridge to evaluate potential repair options. A visual inspection was performed to verify existing conditions of elements of the bridge.
Steere performed a load carrying evaluation of the existing bridge superstructure and substructures. Deterioration and multiple deck joint elimination schemes were accounted for in the evaluation. Steere also conducted multi-modal seismic evaluation and assessment of the bridge using a site specific earthquake. The seismic analysis was performed in accordance with AASHTO LRFD and the RIDOT LRFD Bridge Design Manual for this critical/essential bridge. Both the substructures and the existing stringers were checked for increased loadings due to the possible redistribution of loads caused by the joint elimination. Due to the complex geometry of this portion of the bridge, the entire bridge was modeled as a 3D finite element model including moving load and seismic analyses. A final evaluation report recommending an elimination scheme for the joints was prepared and submitted.
Steere developed contract plans, wrote specifications, and calculated project cost and quantity estimates. The design incorporates performance based FRP strengthening of existing girders and piers. Due to extremely high chloride levels, chloride extraction will be performed on the pier caps, the first time this remediation technique will be used by RIDOT. Rehabilitation work developed by Steere includes pedestal and bearing replacements, concrete deck, pier cap, column, and prestressed concrete girder repairs. Steere’s services will continue through the construction phase including an AASHTO LRFR bridge load rating.
Reference: Mary Vittoria Bertrand, P.E. Construction Completion: 2017 (Est.)
Project Cost: $2.7 Million