HORIZONTAL SHEAR CONNECTION IN COMPOSITE CONCRETE BEAMS UNDER REPEATED LOADING

RESULTS OF AN INVESTIGATION INTO FATIGUE STRENGTH OF THE JOINT IN CONCRETE COMPOSITE MEMBERS ARE PRESENTED. TWENTY-THREE MEMBERS WERE TESTED IN FATIGUE. TWENTY-TWO OF THE PRECAST BEAMS WERE I-BEAMS OR INVERTED T-BEAMS WITH A RELATIVELY NARROW JOINT AND A RECTANGULAR SLAB PLACED ON THEM, THE TWENTY-THIRD BEAM WAS A BOX-BEAM WITH A RELATIVELY WIDE JOINT BUT WITH THE SAME TYPE OF SLAB ON ITS TOP. THE THREE PRINCIPAL VARIABLES WERE THE AMOUNT OF JOINT REINFORCEMENT, THE ROUGHNESS OF THE JOINT AND THE RATIO OF SHEAR SPAN TO EFFECTIVE DEPTH. PARTICULAR ATTENTION WAS GIVEN TO THE RELATIONSHIP BETWEEN DIAGONAL TENSION CRACKING AND CRACKING IN THE HORIZONTAL JOINT. ATTENTION WAS ALSO FOCUSSED ON THE RELATIONSHIP BETWEEN THE DEVELOPMENT OF CRACKING AND SLIP AT THE JOINT AND THE LOSS OF COMPOSITE ACTION. SEVERAL OF THE TEST BEAMS FAILED IN FLEXURE OR IN DIAGONAL TENSION BUT MOST FAILED IN THE JOINT, SOME DURING THE FATIGUE TESTING, AND SOME DURING THE SUBSEQUENT STATIC TEST TO FAILURE. INFORMATION WAS GAINED ABOUT THE INFLUENCE OF THE DIAGONAL TENSION CRACKING ON THE JOINT FAILURE AND ABOUT THE MECHANISM OF JOINT FAILURE. A CRITERION OF JOINT FAILURE HAS BEEN DEFINED SO THAT THE FLEXURAL CAPACITY OF THE COMPOSITE BEAM IS ESSENTIALLY EQUAL TO THAT OF A CORRESPONDING MONOLITHIC BEAM. THIS IMPLIES NO EXTENSIVE LOSS OF COMPOSITE ACTION. AN ALLOWABLE JOINT SHEAR STRESS FOR CONCRETE COMPOSITE BEAMS UNDER FATIGUE LOADING HAS BEEN DEVELOPED ON THE BASIS OF THE TESTS RESULTS. EQUATIONS AS FUNCTIONS OF THE THREE PRINCIPAL VARIABLES ARE RECOMMENDED. /AUTHOR/

• Corporate Authors:

  Lehigh University

  Bethlehem, PA  United States  18015
• Authors:
  • Badoux, J C
  • Hulsbos, C L
• Publication Date: 1965-8

Subject/Index Terms

• TRT Terms: Beams; Bridge members; Composite construction; Concrete; Depth; Fasteners; Fatigue (Mechanics); Fatigue tests; Flexure; Fracture mechanics; Joints; Length; Loads; Shear rate; Shear stress; Static tests; Tension
• Uncontrolled Terms: Bridge spans; Concrete beams; Fatigue life; Loading
• Old TRIS Terms: Connectors; Diagonal tension; Horizontal shear; Joint; Joint reinforcement
• Subject Areas: Bridges and other structures; Highways;

Filing Info

• Accession Number: 00207762
• Record Type: Publication
• Report/Paper Numbers: Hpr-1/1/
• Files: TRIS
• Created Date: Dec 1 1994 12:00AM