INVESTIGATION OF SHEAR BEHAVIOR OF PRESTRESSED CONCRETE BRIDGE GIRDERS

THE REPORT PRESENTS THE RESULTS OF SHEAR TESTS ON EIGHT PRESTRESSED CONCRETE GIRDERS /AASHO TYPE III/ AND FIVE SMALLER REINFORCED CONCRETE BEAMS. THE PRINCIPAL VARIABLE WAS SHEAR REINFORCEMENT, INCLUDING VERTICAL, INCLINED, AND PRESTRESSED REINFORCEMENT, SOME BONDED, SOME UNBONDED. ALL GIRDERS AND BEAMS WERE SIMPLY SUPPORTED AND LOADED EQUALLY AT THE THIRD POINTS OF THE SPAN. SEVEN OF THE GIRDERS FAILED IN SHEAR, ONE HAD A TRANSITIONAL FAILURE. THREE OF THE SMALLER BEAMS FAILED IN SHEAR, TWO IN FLEXURE. RESULTS ARE COMPARED WITH AASHO AND ACI DESIGN CODES. SOME OF THE CONCLUSIONS OF THE STUDY WERE AS FOLLOWS: /1/ THE SHEAR STRENGTH OF FULL SIZE PRESTRESSED CONCRETE GIRDERS CAN BE PREDICTED WITH REASONABLE ACCURACY FROM TESTS ON SMALL LABORATORY SPECIMENS, /2/ IF FAILURE OCCURS FROM FLEXURE SHEAR CRACKING, PRESTRESSING THE WEB REINFORCEMENT DOES NOT ADD TO THE ULTIMATE STRENGTH OF THE MEMBER, AND /3/ THERE WAS NO INCREASE IN THE ULTIMATE SHEAR STRENGTH DUE TO INCLINING THE WEB REINFORCEMENT, BUT THE INCLINED STIRRUPS DID TEND TO BETTER RESTRAIN THE OPENING OF INCLINED CRACKS THAN DID THE VERTICAL STIRRUPS. /BPR/

• Supplemental Notes:
  • Hpr-1/4/, 65-1C
• Corporate Authors:

  Tulane University

  6823 Saint Charles Avenue
  New Orleans, LA  United States  70118

  Louisiana Department of Highways

  P.O. Box 44245, Capitol Station
  Baton Rouge, LA  United States  70804
• Authors:
  • Gustafson, D P
  • Bruce, R N
• Publication Date: 1966-10

Subject/Index Terms

• TRT Terms: Beams; Bridges; Failure; Forecasting; Girders; Material reinforcement; Prestressed concrete; Reinforced concrete; Shear strength; Shear tests; Stirrups; Ultimate strength
• Old TRIS Terms: Shear failures
• Subject Areas: Bridges and other structures; Highways;

Filing Info

• Accession Number: 00207819
• Record Type: Publication
• Source Agency: Bureau of Public Roads /US
• Files: TRIS, STATEDOT
• Created Date: Feb 24 1994 12:00AM