THE EFFECT OF CONCRETE STRENGTH ON THE SHEAR STRENGTH OF REINFORCED CONCRETE BEAMS WITH BAR CUTOFF

THIS IS AN EXPERIMENTAL STUDY OF THE ULTIMATE BEHAVIOR OF REINFORCED CONCRETE BEAMS WHICH FAIL IN SHEAR. THE OBJECTIVES OF THIS INVESTIGATION WERE: (1) TO REPEAT CERTAIN BEAM TESTS OF EARLIER STUDIES HERE AT PURDUE IN ORDER TO CLARIFY AND SUPPLEMENT THEIR INVESTIGATION, (2) TO DETERMINE THE EFFECT OF CONCRETE STRENGTH UPON THE BEHAVIOR AND FAILURE MODE OF BEAMS WITH DIFFERENT SHEAR SPAN TO DEPTH RATIOS, AND (3) TO USE ALL OF THE DATA AVAILABLE IN ORDER TO DRAW CONCLUSIONS. NINE BEAMS FROM THE EARLIER REPORTS WERE RETESTED IN ACCORDANCE WITH THE ORIGINAL PROCEDURE. TEN ADDITIONAL BEAMS WERE CAST TO COMPLETE THE STUDY OF THE CONCRETE STRENGTH. ALL SPECIMENS HAD A 6-BY 13-IN. RECTANGULAR CROSS-SECTION AND WERE LOADED TO SIMULATE A PORTION OF A CONTINUOUS GIRDER. THE BEAMS WERE DESIGNED TO RESTRICT FAILURE TO A SHEAR TYPE FAILURE IN THE LENGTH BETWEEN MAXIMUM NEGATIVE MOMENT AND ZERO MOMENT -- COMMONLY CALLED THE SHEAR SPAN. FAILURE OCCURRED IN TWO MODES, SHEAR COMPRESSION AND DIAGONAL TENSION. IT WAS FOUND THAT THE TYPE OF FAILURE DEPENDED UPON THE POSITION OF THE DIAGONAL CRACK WHEN IT CROSSED THE NEUTRAL AXIS. THE LOCATION OF THE CRITICAL CRACK DEPENDED UPON THE SHEAR SPAN TO DEPTH RATIO AND THE CONCRETE STRENGTH. DETAILED DISCUSSION OF INDIVIDUAL BEAM BEHAVIOR AND THE FAILURE PATTERNS ARE PRESENTED ALONG WITH THE SUMMARY OF TEST RESULTS. /AUTHOR/

• Supplemental Notes:
  • No 16, 136 PP, 58 FIG, 29 TAB, 2 APP
• Corporate Authors:

  Purdue University/Indiana Department of Transportation JHRP

  Purdue University, School of Civil Engineering
  West Lafayette, IN  United States  47907-1284
• Authors:
  • Borchelt, J G
• Publication Date: 1968-7

Subject/Index Terms

• TRT Terms: Beams; Compression; Concrete; Concrete tests; Failure; Flexural strength; Reinforced concrete; Shear strength; Shear tests; Structural tests; Tension
• Uncontrolled Terms: Concrete beams
• Old TRIS Terms: Diagonal tension; Shear failures
• Subject Areas: Bridges and other structures; Highways;

Filing Info

• Accession Number: 00208885
• Record Type: Publication
• Files: TRIS
• Created Date: Jan 31 1994 12:00AM