Maine Trails, April-May '10
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Fast bridges

Accelerated design schedule speeds bridge replacements 

Two i-95 bridges over Route 143 in Etna were completed on time late last year under an accelerated design phase using federally earmarked, high priority funding.
As a condition of awarding the design contract to the engineering firm Erdman Anthony of Rochester, New York, MaineDOT required the design phase be completed in three months, rather than the six to 12 months typical for a project this size. During the initial stage, Erdman Anthony not only developed the design, the firm also completed detailed life-cycle cost analyses of several alternatives, an FHWA requirement to justify design recommendations to replace the structure.
Because the existing 135-foot, three-span structures had sufficiency ratings of greater than 50, it was necessary to develop much shorter single-span alternatives with lower life-cycle costs when compared to rehabilitation alternatives. Additionally, rehabilitation alternatives would not eliminate the non-standard bridge under-clearance, that showed considerable impact damage from large trucks.
After MaineDOT approved Erdman Anthony’s preliminary design, the firm moved directly into final design to meet the deadline. “Without the support and the quick decision making by MaineDOT, we would not have met the deadline,” said Frank Dahar, P.E., project manager for Erdman Anthony.
The replacement bridges are 78 feet long, with 40-foot-wide composite steel plate girder superstructures supported on T-wall wrapped integral abutments on piles. The need to improve deficient bridge under-clearances and minimize impact to I-95 traffic required that the superstructure be designed with shallow, grade 50 steel plate girders.
Erdman Anthony also provided construction administration services during construction. Wyman & Simpson of Richmond constructed the project, and Wendell Harriman of MaineDOT was the resident engineer during construction. Construction cost of the twin I-95 structures was $3.65 million.



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