Repair of the CR 514 Bridge over I-75 in Sumterville, Florida was completed by SDR. The bridge was struck by an over-height truck, causing severe damage to the exterior prestressed concrete girders, including rupture of several prestressing strands and a severe loss of concrete.
Before SDR’s involvement, it was decided to replace the girder. SDR was tasked with assessing the damage (using its in-house developed damage assessment tools) and impact on the structural integrity of the girders; design of the repair; and development of repair details.
Repair of the girders included splicing of ruptured prestressing strands, correcting the alignment and rotation of the bottom flange, restoring the concrete section, substituting ruptured stirrups using Near-Surface-Mounted technique; and applying externally bonded CFRP to confine the restored section and provide redundancy to the shear strength. The special repair techniques utilized allowed I-75 to remain open during construction.
