CONTINUOUS COMPOSITE BEAMS UNDER FATIGUE LOADING

THE RESULTS OF FATIGUE AND STATIC TESTS OF TWO CONTINUOUS COMPOSITE BEAMS ARE REPORTED. THESE AND EARLIER EXPERIMENTAL RESULTS ARE COMPARED WITH COMPUTER STUDIES USING A MATHEMATICAL MODEL TO SIMULATE THE CONTINUOUS COMPOSITE MEMBER WHICH HAS A CRACKED SLAB IN THE NEGATIVE MOMENT REGION. SATISFACTORY CORRELATION WAS OBTAINED BETWEEN COMPUTER AND EXPERIMENTAL VALUES FOR SLAB FORCE, LOADS ON SHEAR CONNECTORS, AND STRAIN DISTRIBUTION IN THE CROSS SECTION. THE STUDY REVEALS THAT THE MATHEMATICAL MODEL CAN BE SATISFACTORILY USED TO EVALUATE THE EFFECT OF CHANGING THE PARAMETERS INFLUENCING THE BEHAVIOR OF THE NEGATIVE MOMENT REGION. THESE PARAMETERS ARE AREA OF LONGITUDINAL REINFORCING STEEL, NUMBER OF LONGITUDINAL BARS, AND SPACING OF SHEAR CONNECTORS. THE STIFFNESS OF THE CRACKED SLAB IN THE NEGATIVE MOMENT REGION IS THE TOTAL AREA OF THE LONGITUDINAL REINFORCING STEEL PLUS AN EFFECTIVE AREA OF CONCRETE DEPENDENT ON THE PARAMETERS GIVEN ABOVE. IT WAS FOUND THAT A BEAM WITH ONE PERCENT OF LONGITUDINAL SLAB REINFORCEMENT IN THE NEGATIVE MOMENT REGION PERFORMED VERY WELL WITH SHEAR CONNECTORS DELETED FROM A LARGE PORTION OF THE NEGATIVE MOMENT REGION AND THE STIFFNESS OF THE SLAB IN TENSION CONSISTED OF THE AREA OF LONGITUDINAL REINFORCEMENT PLUS APPROXIMATELY 20 PERCENT OF THE CONCRETE AREA. /AUTHOR/

• Corporate Authors:

  Lehigh University

  Bethlehem, PA  United States  18015

  Pennsylvania Department of Highways

  400 North Street
  Harrisburg, PA  United States  17120-0095

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Wu, Y C
  • SLUTTER, R G
• Publication Date: 0

Subject/Index Terms

• TRT Terms: Bars (Building materials); Beams; Composite materials; Computer programs; Computers; Concrete; Concrete pavements; Continuous structures; Cracking; Cross sections; Durability; Fasteners; Fatigue tests; Fracture mechanics; Load tests; Longitudinal reinforcement; Mathematical models; Metal bridges; Shear reinforcement; Simulation; Slabs; Static tests; Steel bridges; Stiffness; Strain (Mechanics)
• Uncontrolled Terms: Composite beams; Continuous beams; Experimental data; Negative moment region; Shear connectors
• Old TRIS Terms: Strains
• Subject Areas: Bridges and other structures; Highways;

Filing Info

• Accession Number: 00207985
• Record Type: Publication
• Source Agency: Federal Highway Administration
• Report/Paper Numbers: 68-28
• Files: TRIS, USDOT
• Created Date: Mar 7 1971 12:00AM