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SR 37 @ Ochlockonee River Bridge Replacement Team Members: Michael Curran, Brandon Evans, Paul Lumpkin, Kale Brazier Faculty Advisor: Dr. Mi Geum Chorzepa, PE Superstructure Background Substructure Sponsor/Client: Michael Baker International The superstructure was designed using Mathcad and LEAP Bridge Design software. The reinforced concrete deck uses 7 ¾“ concrete with an 8” thick overhang that supports the 42” parapet and sidewalk. The deck acts as a composite structure with the 6 63” Bulb Tees spaced 7 feet apart on center. The two 60 feet long end spans use 5 ksi concrete with twelve 0.6” reinforcing strands. The longer 130 feet span uses 9 ksi concrete with forty 0.6” strands. The SR 37 bridge over the Ochlockonee River in Moultrie, GA has been determined by the Georgia Department of Transportation (GDOT) to be in need of replacement. Our team was tasked with designing all aspects of the new bridge including alignments, superstructure design, substructure design, etc. The existing bridge span and length are 36’ and 250’, respectively, while the new design will be 42’ wide and 270’ long in order to accommodate growth in the area and optimize safety. Roadway The team used design parameters given by Michael Baker International to determine the roadway alignments by following the AASHTO Greenbook. In doing so, we were able to determine horizontal and vertical alignment thresholds. Three different concepts were developed to determine the best design based on a variety of factors including cost, feasibility, environmental impact, etc. A temporary bridge will be used while demolition of the existing bridge and construction of the new bridge takes place. The bridge superstructure is supported below at two end bents with two intermediate bents. The intermediate bents includes a reinforced concrete cap that is 39 feet long with a 54”x48” cross section. The cap is held up by two square reinforced concrete (48”x48”) cross section columns. Both the column and cap are reinforced with #11 steel reinforcing bars. Below both columns are square concrete footings that have a 12’x12’ cross section that extends 4 feet deep. The footing is reinforced with #8 bars. The concrete strength for all substructure materials is 3.5 ksi. 5 H section steel piles are located below each footing.
