EXTENDING THE SERVICE LIFE OF EXISTING BRIDGES BY INCREASING THEIR LOAD CARRYING CAPACITY

A catalog of bridge deficiencies is developed based on the inspection of over 140 deficient bridges located in Illinois, Florida, Pennsylvania, California, and Tennessee. A classification of structure types is developed for concrete, steel and timber bridges. Deficiencies are related to the structure classification system and a hierarchy of the most common deficiencies established. Techniques presently utilized by state highway departments to correct deficiences are described and evaluated. Several innovative techniques for increasing the load carrying capacity are also described. Utilizing these techniques, increased capacity values are developed. Cost factors are also analyzed and graphic presentations which show the relative merit of each system are presented. Techniques for increasing load capacity include: (1) Lightweight deck systems, e.g., timber, plate, steel grid, metal; (2) changes in structural system, e.g. develop continuity in simple spans, composite action, post tensioning; (3) member strengthening techniques, e.g., epoxy attached plates, replacement members, supplemental support systems. Techniques developed for improving geometrics include widening concepts for through girder bridges and improved clearance for through truss bridges. The report includes examples of techniques developed as they apply to actual bridge rehabilitation projects. Details are shown illustrating these techniques. /FHWA/

  • Corporate Authors:

    Byrd, Tallamy, MacDonald & Lewis

    2921 Telestar Court
    Falls Church, VA  United States  22042
  • Authors:
    • Berger, R H
  • Publication Date: 1978-6

Media Info

  • Pagination: 152 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00193736
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: FHWA-RD-78-133 Final Rpt., FCP 35F2-152
  • Contract Numbers: DOT-FH-11-9214
  • Files: TRIS, USDOT
  • Created Date: Aug 15 1979 12:00AM