Rehabilitation and strengthening have become a major focal point for the Nation's aging bridge inventory. Increased demand for higher legal loads and permit overloads as well as uniform rating criteria necessitates the strengthening of a large number of short and medium span bridge structures. Frequently, the strengthening of bridge superstructures goes hand in hand with rehabilitation measures of the bridge deck and the road surface, such as structural concrete overlays or widening measures to accomodate additional traffic lanes. The objective of the performed research was to investigate the feasibility and effectiveness of various strengthening techniques for reinforced concrete bridge superstructures by means of full-scale experimental testing under controlled laboratory conditions. The rehabilitation and strengthening measures investigated were (1) full depth structural concrete overlays, (2) epoxy injection of cracks, (3) external post-tensioning, and (4) addition of a high strength precast concrete bottom soffit panel. These different rehabilitation measures were subsequently applied to and tested on a 11 ft 6 in. wide and 56 ft long section of an existing cast-in-place reinforced concrete T-girder bridge which was in service for 25 years prior to removal for the above tests. The testing comsisted of forced vibration tests to determine changes in the response characteristics, service level wheel load tests, overload tests, rolling load tests and ultimate limit state tests. A complete account of the various strengthening measures as well as a comprehensive analysis of the test results are presented in this report.

  • Supplemental Notes:
    • This study was funded jointly by Caltrans and the National Science Foundation.
  • Corporate Authors:

    University of California, San Diego

    Department of Applied Mechanics and Engineering Sciences
    La Jolla, CA  United States  92093-0085

    California Department of Transportation

    Division of Structures, 1801 30th Street
    Sacramento, CA  United States  94272-0001
  • Authors:
    • Seible, F
    • Priestley, MJN
    • Krishnan, K
  • Publication Date: 1990-12

Media Info

  • Features: Appendices; Figures; Photos; References; Tables;
  • Pagination: 174 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00622302
  • Record Type: Publication
  • Report/Paper Numbers: UCSD/SSRP-90/06
  • Contract Numbers: RTA 13945-53D408
  • Created Date: May 31 1996 12:00AM