The Sunshine Skyway that crosses the entrance to Tampa Bay south of St. Petersburg, Florida, on a 6.5-km (4-mile) bridge consists of two separate two-lane structures constructed primarily of prestressed concrete girders on reinforced concrete pile bents. The older of the two structures was completed in 1954 and was one of the earliest of its type in the U.S. The girders were post tensioned with steel bars grouted in steel conduits, but spalling and rusting were observed before the bridge was 20 years old. Florida Department of Transportation engineers investigated the structural integrity of the bridge and transported six girders to the University of Florida in Gainesville for laboratory tests. Five of these girders were tested under static loads to determine ultimate flexural capacities, and two were found to be extensively spalled with corroded prestressing bars. These two were the only ones to exhibit a premature fracture of the bars. The tests indicated that no serious loss of strength would be likely to occur before extensive spalling of the concrete revealed badly corroded or fractured bars. Girders can therefore be periodically inspected for removal and replacement before collapse becomes imminent. /Author/

Media Info

  • Media Type: Print
  • Features: Figures; Photos; References; Tables;
  • Pagination: pp 1-6
  • Monograph Title: Evaluating Bridge Structures, Pavement Maintenance, Roadside Management, Deicing Salts, Transport of Hazardous Materials
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00184722
  • Record Type: Publication
  • ISBN: 0309026768
  • Report/Paper Numbers: HS-024 782
  • Files: TRIS, TRB
  • Created Date: Dec 29 1978 12:00AM