The replacement bridge was expanded from the original bridge according to the “South Dakota Bridge System Code Manual – 1998 Edition” obtained from the SDDOT. The replacement bridge was then extended to span 120 ft. as compared to the original length of 90 ft. All design of the bridge girders and deck is based on the 120 ft expansion.

The design truck loading for this bridge is for an HS20-44 and an estimated daily traffic volume of 100 vehicles per day.

The design of this structure is for a continuous span, prestressed concrete I-

Girder design was figured by calculating the maximum moment and shear exerted on each girder. It was assumed that the dead load from the New Jersey Barrier, the future wearing surface, and the diaphragm were distributed evenly among the girders. The dimensions of the diaphragm were obtained from “Design of Modern Highway Bridges” by Narendura Taly because no reference to the diaphragm dimensions could be found in the AASHT specifications. The dead, live, and impact load moments were totaled and calculated to be 43, 022 k-in. Due to lack of experience and knowledge, the steel reinforcement for the I-Beams could not be determined. Therefore, the moment capacity of the girder could not be figured. The girder is assumed to have adequate moment capacity based on the design graphs obtained from South Dakota Concrete Products (See Figure 8.1). The total design shear from the dead, live and impact loads was 125 kip. The shear capacity of the I-Beam proved to be sufficient.

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