THE CONCRETE BRIDGE MAGAZINE

WINTER 2011

ASPIRE is a quarterly magazine published by PCI in cooperation with the associations of the National Concrete Bridge Council. The editorial content focuses on the latest technology and key issues in the Concrete Bridge Industry.

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36 | ASPIRE , Winter 2011 CBP Concrete Bridge Preservation State Street Bridge Rehabilitation Careful planning retains substructures and arches of 83-year-old concrete bridge by Manjeet Ahluwalia, TranSystems With a contracted economy, limited budgets, and continued deterioration of the state's structurally defcient bridges, it is challenging to stretch available funding by applying the latest materials and techniques to bridge rehabilitation. One such project is the rehabilitation of the State Street Bridge carrying State Route 4028 over the Schuylkill River in the Borough of Hamburg, Berks County, Pa. Because of its proximity to I-78 over the Schuylkill River, the State Street Bridge is an impor- tant local transportation link. The existing six-span structure, built in 1927, consisted of four main spans of open spandrel reinforced concrete arches and two cellular abutment ap- proach spans supporting a 24-ft-wide roadway over a total length of 529 ft. The main-span arches each span 86 ft between springlines. The arch ribs are longitudinally offset to match the 48-degree skew of the piers that are uniformly spaced at 95-ft centers. Each pair of arch ribs supports spandrel columns, transverse foor beams and opposing cantilevered sidewalk brackets, spandrel beams, and longitudinal beams. The two approach spans were supported by corresponding four-sided cellular abutments, consisting of U-shaped wingwalls. Transverse foor beams spanned the interior between the wingwalls, and sidewalk brackets were cantilevered from the outer faces of the wingwalls. Based on the results of TranSystems' bridge inspection fnd- ings, concrete testing, and structural analysis and ratings, it was concluded that the bridge required major rehabilitation to maintain its structural integrity and load-carrying capability. It was determined that the arch ribs and the substructures were suitable for reuse in the rehabilitated structure. The selected rehabilitation strategy included rehabilitation of the existing main arches, deck and foor beam replacement, concrete re- CBP CONCRETE BRIDGE PRESERVATION South elevation of the recently rehabilitated State Street Bridge over the Schuylkill River in Berks County, Pa. All photos: TranSystems. Book_Win11.indb 36 1/4/11 2:34 PM

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