COMPUTER ANALYSIS OF SEGMENTALLY ERECTED 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 development of an analysis technique with an assocaited computer program to permit efficient analysis of constant depth segmental prestressed concrete box girders at all stages of erection. An existing box girder analysis program developed for analysis of completed structures was substantially altered to make it applicable to the multistage construction problem. The computer program has been written to simulate the complete construction sequence after a reasonable amount of user-generated data. The program provides a complete analysis for stresses and deflections at each stage of construction and will, at the user's option, compute revised tendon stresses for all tendons stressed earlier in the sequence and bonded by grouting. The use of the computer program is demonstrated by means of several practical examples, including an analysis of the first bridge of this type in the United States, erected at Corpus Christi, Texas. The general applicability of the program was verified in a related study by Kashima wherein measurements were made in a realistic model study of the Corpus Christi bridge and good correlation was obtained. /FHWA/

  • Supplemental Notes:
    • Sponsored by Texas State Department of Highways and Public Transportation in cooperation with FHWA.
  • Corporate Authors:

    University of Texas, Austin

    Center for Highway Research, 200 West 21st Street
    Austin, TX  United States  78712

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Brown Jr, R C
    • Burns, N H
    • Breen, J E
  • Publication Date: 1974-11

Media Info

  • Pagination: 245 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00130606
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: CFHR-3-5-69-121-4 Res. Rpt., FHWA-RD-75-S0415
  • Files: NTIS, TRIS, USDOT
  • Created Date: Mar 29 1977 12:00AM