PRESTRESSED COMPOSITE HYBRID BEAMS

IN THE "PREFLEX" AND OTHER SYSTEMS AN INTERNAL BENDING STRESS IS OBTAINED BY BENDING MILLED GIRDERS OF FE-52 STEEL, WITH A SYMMETRICAL SECTION ABOUT THE DIRECTION OF BENDING, TO FORM A COMPOSITE CONCRETE SLAB. HOWEVER, USE OF FE-52 STEEL ENTAILS A REDUCED STRESS LIMIT DURING THE PRELIMINARY FLEXURE OF THE GIRDERS. ACCORDINGLY, WORK WAS UNDERTAKEN TO TEST THE APPLICABILITY OF A COMPOSITE, DISSYMMETRIC, WELDED HYBRID BEAM WITH A HIGH YIELD STRENGTH FLANGE COMPONENT, SUCH AS T-1 STEEL. THE FE-52/T-1 YIELD STRENGTH RATIO IS ABOUT 0.5. THE FINDINGS OF PREVIOUS RESEARCH ARE COMBINED WITH A MATHEMATICAL ANALYSIS TO SHOW THAT USE OF STEELS LIKE T-1 MAKES IT POSSIBLE TO ACHIEVE HIGHER PRECOMPRESSION STRENGTH. T-1 STEEL CAN BE USED AT ITS MAXIMUM PERMISSIBLE TENSILE STRUCTURAL STRESS. WELDING COSTS CAN BE AT LEAST PARTIALLY OFFSET BY THE POSSIBILITY OF OBTAINING A COUNTERFLEXURE WITHOUT PARTICULAR OPERATIONS.

• Corporate Authors:

  Intl Assoc Bridge & Struct Eng /Switz

  /Ninth Congress
  ,   United States 
• Authors:
  • Bo, G M
  • Daddi, I
• Publication Date: 1972-5-13

Media Info

• Features: Figures; References;
• Pagination: p. 203-7
• Serial:
  • Publication of: Intl Assoc Bridge & Struct Eng /Switz/
  • Publisher: Intl Assoc Bridge & Struct Eng /Switz

Subject/Index Terms

• TRT Terms: Beams; Composite materials; Flexure; Prestressed concrete; Prestressing; Steel; Tension; Welding
• Uncontrolled Terms: Composite beams; Hybrids; Tensile stress
• Subject Areas: Bridges and other structures; Highways;

Filing Info

• Accession Number: 00209782
• Record Type: Publication
• Files: TRIS
• Created Date: May 15 1973 12:00AM