FIRE RESISTANCE OF PRESTRESSED CONCRETE BEAMS - STUDY C: STRUCTURAL BEHAVIOR DURING FIRE TESTS

THE THIRD PART OF AN INVESTIGATION OF THE FIRE RESISTANCE OF SIMPLY SUPPORTED PRESTRESSED CONCRETE BEAMS IS DESCRIBED. FIRE TESTS WERE CONDUCTED ON THIRTEEN 40-FT-LONG TEE BEAMS. IN THREE BEAMS, COLD-DRAWN 7-WIRE STRAND WAS PRETENSIONED. POST-TENSIONED, HIGH-STRENGTH, HOT-ROLLED ALLOY STEEL BARS WERE USED IN THREE BEAMS; AND POST-TENSIONED, BUTTONHEADED, COLD-DRAWN WIRES IN CABLES WERE USED IN FOUR. GRADE 40 DEFORMED BARS WERE USED IN ONE NONPRESTRESSED BEAM AND GRADE 60 IN TWO. SOME OF THE BEAMS WERE MADE OF STRUCTURAL LIGHTWEIGHT CONCRETE AND OTHRS OF NORMAL-WEIGHT CONCRETE. IN SOME OF THE BEAMS, THE POST-TENSIONED REINFORCEMENT WAS GROUTED AND IN THE OTHERS IT WAS UNBONDED. THE MINIMUM CONCRETE COVER FOR EACH BEAM WAS 2-1.2 IN. ALL BEAMS WERE SIMPLY SUPPORTED ON ROCKER-ROLLER SUPPORTS AND SUSTAINED FULL DESIGN LOAD DURING THE TESTS. FIRE ENDURANCES RANGED FROM 3 HOURS TO MORE THAN 6 HOURS. ANALYSES OF STRUCTURAL BEHAVIOR DURING THE TESTS ARE GIVEN. DATA ARE ALSO INCLUDED ON DEFLECTION, ELONGATION, AND STEEL AND CONCRETE TEMPERATURES. /AUTHOR/

• Supplemental Notes:
  • No 009.01b, 29 PP, 47 FIG, 7 TAB, PHOTS, 18 REF, 3 APP
• Authors:
  • Gustaferro, A H
  • Abrams, M S
  • Salse, E A
• Publication Date: 1971

Media Info

• Serial:
  • Portland Cement Assoc R & D Lab Bull

Subject/Index Terms

• TRT Terms: Beams; Concrete tests; Fire resistance; Flexural strength; Prestressed concrete; Prestressing; Reinforced concrete; Structural tests; Thermal expansion
• Subject Areas: Bridges and other structures; Highways;

Filing Info

• Accession Number: 00209607
• Record Type: Publication
• Files: TRIS
• Created Date: Apr 10 1972 12:00AM