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The Superstructure Elements And Its Effect On The Portion Of The Bridge Structure

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.0 Superstructure
The superstructure elements will be defined as those inclusive to the portion of the bridge structure, which forms the horizontal span, all components above the bearings. The following will delineate the major superstructure elements, and investigate accelerated bridge construction techniques and technologies, which can be applied. The major structural components, which will be examined in the following section, will include girders, stay-in-place deck forms, deck panels and modular superstructure construction systems.
1.1 Girders
Bridge girders for the purpose of the following examination will be divided into two (2) sections: steel girders and precast - prestressed concrete girders. The use of shop fabricated girders …show more content…

Department of Transportation, Federal Highway Administration Accelerated bridge construction manual “Adjacent butted precast girder systems such as double tees and deck bulb tees create opportunities for ABC. These girders function as both the beam and the deck, thereby eliminating the need for deck placement in the field.” (U.S Department of Transportation, 2011)
1.2 Stay-in-Place Deck Forms
A significant portion of the bridge construction schedule can be attributed to the forming and stripping of concrete deck forms. Stay-in-place concrete deck forms are used to eliminate the need to strip forms after the concrete deck has been cast and cured. The two (2), most common forms of stay-in-place deck forms are corrugated steel sheets and partial depth precast concrete panels. (U.S Department of Transportation, 2011)
1.2.1 Corrugated Steel Stay-in-Place Deck Forms
Galvanized corrugated steel sheets are placed above the bridge girders from flange to flange to act as a stay-in-place deck form. Furthermore, these steel deck forms act to provide support for the reinforcing steel in the deck slab as well as supporting the weight of weight concrete during the construction process. Corrugated steel stay-in-place deck forms remain in place for the live of the structure thus serving to eliminate the need of form stripping and the associated schedule time. Corrugated Steel Stay-in-Place Deck Forms can be used on steel and precast – prestressed

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