SHEAR STRENGTH OF REINFORCED CONCRETE T-BEAMS

AN EXPERIMENTAL STUDY WAS CONDUCTED ON THE ULTIMATE LOAD BEHAVIOR OF REINFORCED CONCRETE BEAMS WHICH FAIL IN SHEAR TO OBSERVE THE BEHAVIOR OF T-BEAMS WITH VARIOUS SHEAR SPAN-TO- DEPTH RATIOS AND AMOUNTS OF WEB REINFORCEMENT, AND TO COMPARE THESE BEAMS TO SIMILAR RECTANGULAR BEAMS IN AN ATTEMPT TO JUSTIFY THE STANDARD PRACTICE OF NEGLECTING THE EFFECT OF THE FLANGE ON THE SHEAR STRENGTH OF THE BEAM. TEN T-BEAMS WITH A WEB OF 6 INCHES BY 13 INCHES RECTANGULAR CROSS-SECTION AND 3-INCH THICK FLANGE OF 30 INCHES TOTAL FLANGE WIDTH WERE LOADED TO SIMULATE A PORTION OF A CONTINUOUS GIRDER SUBJECTED TO CONCENTRATED LOADS. THE BEAMS WERE DESIGNED SO THAT THE CRITICAL SECTION FOR FAILURE WAS LOCATED BETWEEN THE SECTION OF ZERO MOMENT AND THE SECTION OF MAXIMUM NEGATIVE MOMENT - COMMONLY CALLED THE SHEAR SPAN. THE MAJOR VARIABLES WERE THE SHEAR SPAN-TO-DEPTH RATIO AND THE AMOUNT OF VERTICAL STIRRUPS WITHIN THE SHEAR SPAN. FOUR ADDITIONAL BEAMS WERE TESTED AS SIMPLY-SUPPORTED MEMBERS WITH TWO CONCENTRATED LOADS AND THE MAJOR VARIABLE WAS THE TOTAL FLANGE WIDTH. IT WAS FOUND THAT AS THE SHEAR SPAN-TO- DEPTH RATIO INCREASED, THE AVERAGE SHEAR STRESS AT FAILURE DECREASED. THE COMPARISON OF T-BEAMS TO RECTANGULAR BEAMS JUSTIFIED THE STANDARD PRACTICE OF NEGLECTING THE EFFECT OF THE FLANGE ON THE SHEAR STRENGTH OF A BEAM. DETAILED DISCUSSION OF THE FAILURE PATTERNS AND INDIVIDUAL BEAM BEHAVIORS ARE PRESENTED ALONG WITH A SUMMARY OF TEST RESULTS.

• Supplemental Notes:
  • No 4, 141 PP, 62 FIG, 24 TAB, 18 REF, 4 APP
• Corporate Authors:

  Purdue University/Indiana Department of Transportation JHRP

  Purdue University, School of Civil Engineering
  West Lafayette, IN  United States  47907-1284
• Authors:
  • Wehr, K E
• Publication Date: 1967-1

Subject/Index Terms

• TRT Terms: Breaking loads; Bridge members; Depth; Flanges; Length; Material reinforcement; Reinforced concrete; Shear strength; Shear stress; Stirrups; T beams; Webbing
• Uncontrolled Terms: Bridge spans
• Subject Areas: Bridges and other structures; Highways;

Filing Info

• Accession Number: 00208302
• Record Type: Publication
• Files: TRIS
• Created Date: Jul 21 1994 12:00AM