THE CONCRETE BRIDGE MAGAZINE

WINTER 2018

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.

Issue link: http://www.aspiremagazinebyengineers.com/i/922349

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section and the 5-ksi concrete infill. Composite action is primarily achieved through two mechanisms: frictional bond transfer between the steel pipe pile section and the concrete infill and, for larger 30-in.-diameter spiral-welded pipe piles, the projection of the weld. Because the upper portion of the piles is exposed to air and water, the piles were galvanized from the top of the pile to a minimum of 15 ft below the ground surface, to provide a level of protection against corrosion. Conventionally reinforced cast-in-place concrete pier caps were chosen for their simplicity and cost-effectiveness. Precast, Prestressed Concrete I-Girder Superstructure During the preliminary design phase, the preferred type of superstructure selected was precast, prestressed concrete I-girders. This girder type is a go-to solution in Minnesota for a low-cost and low-maintenance superstructure. Multiple suppliers in the area, quick turn- around time, and ease of construction make them the preferred option in most cases. For these reasons, precast concrete girders were the right solution for the Trunk Highway 101 Bridge. To span between the piers, 45-in.-deep MnDOT girders were selected. The typical bridge cross section consists of nine girders spaced at 8 ft 11 in., with the last three spans varying slightly because of a curve at the end of the bridge. The spans range from about 87 ft to about 105 ft in length. There are a total of 41 spans in 13 units separated by strip-seal joints. A unit consisted of Typical cross section of bridge. Various techniques were used to construct the 13 deck segments in order to evaluate their effects on deck performance. Gang vibrators, as shown here, were used for one segment. 20 | ASPIRE Winter 2018 H A M I L T O N F O R M C R E A T E S F U N C T I O N C A S E S T U D Y A R C H E D S O F F I T F O R C U R V E D B R I D G E B E A M 21 Hamilton Form Company, Ltd. 7009 Midway Road • Fort Worth, Texas 76118 Custom forms. Custom equipment. Practical solutions. The Project: The Frederick Avenue Bridge in Baltimore, designed to replicate the historical character of the original bridge built in 1930. The Challenge: Northeast Prestressed Products supplied the precast elements including 12 arched sections assembled to replicat e the look of the original double arches. The Solution: Hamilton Form fabricated a 44' long soffit that curves to a 52'6" radius, holding tight dimensional tolerances. The Results: The quality of the precast product is dependent on the form it's cast in. The resulting product is stunning. When your project calls for innovative, f lexible formwork solutions. C all on Hamilton Form. 817 590-2111 or sales@hamiltonform.com "The curved beams for this project were critical. Hamilton Form's soffit made the casting simple. I always count on them when quality and dimensional accuracy are critical." Dennis Fink, General Manager, Plant Operations Northeast Prestressed Products, LLC

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