2011 Engineering Excellence Award for Bridge Design The Bridge Replacement of US 31 over I-465 and Lick Creek is the recipient of the American Council of Engineering Companies Honor Award.
SJCA completed the design in less than nine months to allow INDOT to take advantage of the favorable bid conditions. The project consists of replacement of the superstructure for an existing seven span bridge. A new steel beam superstructure was selected in order to minimize the dead loads and utilize the existing substructure units. The structure also consists of three superstructure units to minimize forces exerted on the substructure units. This design concept resulted in a significant decrease in the weight and cost of structural steel required. The expansion joints at the existing end bents were elimininated by providing semi-integral end bents. The caps and columns of the interior bents were also replaced.
The existing bridge width was too narrow to maintain two lanes of traffic in each direction on this heavily traveled arterial. The traffic volume on the northbound lane is significantly higher than the southbound lane during the AM peak with the opposite condition during the PM peak. A movable barrier was utilized to maintain two lanes of traffic in the peak direction and avoid temporary over-widening of the bridge to maintain two lanes of traffic in each direction. This concept saved thousands of dollars by avoiding substructure widening.
Construction Cost: $4,016,000
2010 Engineering Excellence Award for Bridge Design The Bridge Replacement for the Accelerate 465 Project- of 21st Street over I-465 is the recipient of American Council of Engineering Companies Honor Award.
The 21st Street Bridge over I-465 is the first bridge in Indiana to be constructed using Precast Prestressed Concrete U-Beams, a new technology. The advantages of the U-Beam compared to other Indiana standard beams are reduced structure depth, improved aesthetics, and more efficient use of materials. Other benefits include less interruption to traffic and ease of construction period, due to no exterior diaphragms and fewer number of beams to be erected. The 21st street Bridge consists of two equal spans of 116 feet. The 51 foot-wide superstructure is supported by three 54 inch-deep prestressed concrete U-Beams spaced at 18'-6", and 7' overhangs. The precast beams were cast using high performance concrete with design strength of 10,000 psi.
Construction Cost: $7,050,000
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