THE DESIGN AND OPTIMIZATION OF SEGMENTALLY PRECAST PRESTRESSED BOX GIRDER BRIDGES

The economic advantages of precasting can be combined with the structural efficiency of prestressed concrete box girders for long span bridge structures when erected by segmental construction. The complete superstructure is precast in box segments of convenient size for transportation and erection. These precast segments are erected in cantilever and post-tensioned together to form the complete superstructure. This report details the application of design, analysis, and optimization techniques to segmentally precast prestressed concrete box girder bridges. These were classified into two main types according to their method of construction, namely those constructed on falsework and those erected in cantilever. Design procedures are developed for both types of construction. Both ultimate strength and service load design criteria are satisfied under all loading conditions. Sample designs are carried out for the case of a hypothetical two-span bridge constructed on falsework and that of an actual three-span bridge erected in cantilever. Optimization techniques are used to find the optimal cross sections, i.e., those having minimum cost for such bridges.

  • Supplemental Notes:
    • Study conducted in cooperation with FHWA.
  • Corporate Authors:

    University of Texas, Austin

    Center for Highway Research, 200 West 21st Street
    Austin, TX  United States  78712
  • Authors:
    • Lacey, G C
    • Breen, J C
  • Publication Date: 1975-8

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: 250 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00135910
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: CFHR 3-5-69-121-3 Intrm Rpt.
  • Files: TRIS
  • Created Date: Sep 4 1977 12:00AM