A STUDY OF THE BEHAVIOR OF REINFORCED CONCRETE BEAMS SUBJECTED TO REPEATED LOADS

SIXTEEN BEAMS OF 6 X 13-IN. RECTANGULAR CROSS-SECTION WERE SUBJECTED TO REPEATED LOADING IN SUCH A MANNER AS TO SIMULATE A PORTION OF A CONTINUOUS GIRDER SUBJECTED TO CONCENTRATED LOADS. THE BEAMS WERE DESIGNED SO THAT THE CRITICAL REGION FOR FAILURE WITH RESPECT TO SHEAR WAS THE LENGTH BETWEEN THE POINT OF ZERO MOMENT AND THE POINT OF MAXIMUM NEGATIVE MOMENT - COMMONLY CALLED THE SHEAR SPAN. THE OBJECTIVE OF THIS STUDY WAS TO OBSERVE THE BEHAVIOR OF BEAMS OF DIFFERENT SHEAR SPAN-TO-DEPTH RATIO WITH VARYING AMOUNTS OF WEB REINFORCEMENT. THE MAGNITUDE OF THE REPEATED LOAD WAS TAKEN AS A PERCENTAGE OF THE PREDICTED ULTIMATE LOAD AND WAS VARIED TO DETERMINE THE EFFECT ON THE BEHAVIOR OF THE SPECIMENS. THE SPECIMENS, WHICH WERE WEAK WITH RESPECT TO SHEAR, FAILURED IN ONE OF THREE MODES: SHEAR- COMPRESSION, DIAGONAL TENSION, OR BRITTLE FRACTURE OF THE REINFORCEMENT. IT WAS FOUND THAT THE FATIGUE LIFE OF THE MEMBER INCREASED WHEN THE MAGNITUDE OF THE REPEATED LOAD WAS REDUCED. THE PRESENCE OF STIRRUPS WAS OBSERVED TO INCREASE THE ENDURANCE OF A MEMBER WHEN COMPARED TO THE BEHAVIOR OF A SIMILAR SPECIMEN WITHOUT WEB REINFORCEMENT. DETAILED DISCUSSION OF THE FAILURE PATTERNS AND INDIVIDUAL BEAM BEHAVIOR ARE PRESENTED ALONG WITH THE SUMMARY OF TEST RESULTS. /AUTHOR/

• Supplemental Notes:
  • Final RepT, NO 30, 133 PP, 46 FIG, 22 TAB, 21 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:
  • Rogers, W A
• Publication Date: 1967-11

Subject/Index Terms

• TRT Terms: Accelerated tests; Beams; Breaking loads; Compression; Concrete; Depth; Fatigue (Mechanics); Fracture mechanics; Material reinforcement; Rectangles; Reinforced concrete; Repeated loads; Specimens; Stirrups; Structural analysis; Structural mechanics; Tension; Webbing
• Uncontrolled Terms: Concrete beams; Fatigue life; Structural behavior
• Old TRIS Terms: Diagonal tension; Shear span
• Subject Areas: Bridges and other structures; Highways;

Filing Info

• Accession Number: 00208415
• Record Type: Publication
• Files: TRIS
• Created Date: Mar 12 1994 12:00AM