SMALL SCALE REINFORCED CONCRETE MODELS

THIS RESEARCH PROJECT IS AN EXPERIMENTAL STUDY ON THE FEASIBILITY OF USING SMALL SCALE MODELS TO REPRESENT REINFORCED CONCRETE BEAMS. THE SPECIFIC OBJECTIVES WERE: (1) TO ESTABLISH MODEL TECHNIQUES AND MATERIALS APPLICABLE TO SMALL SCALE BEAMS, AND (2) TO COMPARE MODEL TEST RESULTS FROM LARGER SCALE BEAMS. IN ORDER TO ACCOMPLISH THE OBJECTIVES OF THE RESEARCH, FIFTY-THREE MODEL BEAMS OF DIFFERENT SIZES AND SHAPES WERE USED. CYLINDERS WERE USED TO DETERMINE MODEL CONCRETE PROPERTIES. THE SPECIMENS OF SERIES 1 AND 2 WERE SIMPLY-SUPPORTED RECTANGULAR BEAMS. THE VARIABLES USED IN THESE TWO SERIES WERE AMOUNT AND TYPE OF REINFORCING AS WELL AS THE CROSS-SECTIONAL AREA OF THE BEAMS. FOUR TYPES OF MODEL REINFORCING WERE UTILIZED, NAMELY: THREADED ROD, ANNEALED AND UNANNEALED, AND DEFORMED WIRE, ANNEALED AND UNANNEALED. FROM THE TEST DATA OBTAINED FROM THESE SPECIMENS THE TEST ULTIMATE MOMENT WAS COMPARED WITH THE THEORETICAL ULTIMATE MOMENT AS CALCULATED USING ULTIMATE STRENGTH THEORY. IN GENERAL, CORRELATION BETWEEN TEST AND THEORY WAS EXCELLENT, WITH MOST BEAMS BEHAVING AS THE THEORY PREDICTED. THE MODELS OF SERIES 3 WERE INTENDED TO SIMULATE SOME PREVIOUS WORK DONE BY W. N. HARVEY. RESULTS FROM THESE TESTS INDICATED THAT MODELING OF SUCH BEAMS IS MUCH MORE DIFFICULT. ALTHOUGH SOME OF THE BEAMS DID BEHAVE SIMILARLY TO THEIR PROTOTYPE, IT WAS IMPOSSIBLE TO ESTABLISH THAT STIRRUP SPACING AFFECTED BEAM STRENGTH. ON THE OTHER HAND, THOSE BEAMS OF SHORT SHEAR SPAN EXHIBITED A SIZE EFFECT, WITH SOME FAILURES OCCURRING OUTSIDE THE SHEAR SPAN. THE BEAMS OF SERIES 4 WERE MODELS OF BEAMS TESTED BY K. E. WEHR. THESE MODELS WERE DISTORTED HAVING A SLIGHTLY DIFFERENT STEEL PERCENTAGE THAN THEIR PROTOTYPE SPECIMENS. THE RESULTS OF THESE TESTS INDICATED THAT WITH CAREFUL CONSIDERATION A SLIGHT MODEL DISTORTION WILL NOT AFFECT THE RESULTS. /AUTHOR/

• Supplemental Notes:
  • No 15, 125 PP, 41 FIG, 13 TAB, 3 APP
• Corporate Authors:

  Purdue University/Indiana Department of Transportation JHRP

  Purdue University, School of Civil Engineering
  West Lafayette, IN  United States  47907-1284
• Authors:
  • Van, SICLEN RC
• Publication Date: 1968-7

Subject/Index Terms

• TRT Terms: Beams; Concrete; Concrete tests; Cross sections; Deformed bars; Fibers; Flexural strength; Material reinforcement; Mathematical models; Physical properties; Prototypes; Reinforced concrete; Shear strength; Steel; Structural tests; Theory; Ultimate strength
• Uncontrolled Terms: Concrete beams; Concrete properties; Cylinders; Model tests; Models; Threads
• Subject Areas: Bridges and other structures; Highways;

Filing Info

• Accession Number: 00208934
• Record Type: Publication
• Files: TRIS
• Created Date: Apr 21 1994 12:00AM