THROUGH-VOIDED AND CONVENTIONAL BOX BEAMS SUBJECTED TO COMBINED BENDING AND TORSION

RESULTS ARE PRESENTED OF LABORATORY TESTS OF FOUR PRESTRESSED CONCRETE BOX BEAMS. THE BEAMS WERE SUBJECTED TO STATIC LOADS WHICH PRODUCED PURE BENDING AS WELL AS COMBINED BENDING AND TORSIONAL STRESSES. ONE BEAM WAS 36 INCHES DEEP AND WAS CONSTRUCTED WITH END BLOCKS AND INTERIOR DIAPHRAGMS. THE OTHER BEAMS WERE 36 INCHES, 27 INCHES, AND 17 INCHES DEEP, AND WERE THROUGH VOIDED. SOME CONCLUSIONS RESULTING FROM THE STUDY WERE: (1) END BLOCKS AND INTERIOR DIAPHRAGMS DO NOT SIGNIFICANTLY AFFECT THE TORSIONAL RIGIDITY OF PRESTRESSED CONCRETE BOX BEAMS, (2) THE LATERAL TIE-ROD FORCES WHICH WERE REQUIRED TO HOLD THE BEAMS IN LINE WHILE APPLYING AN ECCENTRIC LOAD WERE SMALL, AND (3) DIAPHRAGM STRESSES IN THE PLANE OF THE DIAPHRAGM OF THE 36 INCH DEEP BEAM WERE SMALL. /BPR/

• Supplemental Notes:
  • Hpr-1(5), BPR NO 15, STATE NO 100
• Corporate Authors:

  Pennsylvania State University, University Park

  Pennsylvania Transportation Institute, Transportation Research Building
  University Park, PA  United States  16802

  Pennsylvania Department of Highways

  400 North Street
  Harrisburg, PA  United States  17120-0095

  Bureau of Public Roads /US

  400 7th Street, SW
  Washington, DC  United States  20590
• Authors:
  • Barnoff, R M
  • Hoblitzell, J R
  • McClure, R M
• Publication Date: 1969-1

Subject/Index Terms

• TRT Terms: Beams; Bending; Blocks; Box beams; Diaphragms (Engineering); Laboratory tests; Prestressed concrete; Prestressing; Static loads; Stresses; Tie rods; Torsion
• Uncontrolled Terms: Interior
• Old TRIS Terms: Diaphragms; End blocks
• Subject Areas: Bridges and other structures; Highways;

Filing Info

• Accession Number: 00207906
• Record Type: Publication
• Source Agency: Bureau of Public Roads /US
• Files: TRIS
• Created Date: Jul 22 1994 12:00AM