THEORETICAL STRESSES AND STRAINS FROM HEAT CURVING

HORIZONTALLY CURVED STEEL GIRDERS FOR CURVED HIGHWAY BRIDGES CAN BE ECONOMICALLY FABRICATED BY BUILDING A STRAIGHT GIRDER AND THEN HEATING APPROPRIATE FLANGE EDGES TO INDUCE A RESIDUAL CURVATURE AFTER COOLING. THE RESULTS OF A THEORETICAL INVESTIGATION OF THE RESIDUAL STRESS, STRAIN, AND CURVATURE DUE TO THIS HEAT-CURVING PROCESS PROCESSES ARE PRESENTED. THE ANALYTICAL MODEL USED A PERFECT ELASTIC-PLASTIC, TEMPERATURE-DEPENDENT STRESS-STRAIN RELATIONSHIP FOR THE STEEL, AND TEMPERATURE PROFILES IN THE GIRDER FLANGES BASED ON HEAT-TRANSFER THEORY FOR A SEMI-INFINITE PLATE. THE EFFECTS OF MAXIMUM EDGE TEMPERATURES TO 1,150 DEGREES F OVER INCREASING WIDTHS OF THE FLANGES OF A TYPICAL GIRDER WERE DETERMINED. THE RESIDUAL STRESSES AFTER HEAT CURVING WERE TENSILE NEAR THE FLANGE EDGE AND COMPRESSIVE ELSEWHERE, EXCEPT NEAR THE CENTER OF THE FLANGE, WHERE TENSILE STRESS SOMETIMES REMAINED. THE FINAL CURVATURE, WHICH WAS DETERMINED FROM THE RESIDUAL STRAIN DISTRIBUTION, GENERALLY INCREASED WITH MAXIMUM TEMPERATURE. /ASCE/

• Supplemental Notes:
  • Vol 96, No ST 7, PROC PAPER 7410, PP 1421-1444, 17 FIG,
• Authors:
  • Brockenbrough, R L
• Publication Date: 1970-7

Media Info

• Serial:
  • Journal of the Structural Division
  • Publisher: American Society of Civil Engineers

Subject/Index Terms

• TRT Terms: Curvature; Curves (Geometry); Deformation curve; Flanges; Girders; Heat transfer; Heating (Structures); Highway bridges; Plasticity; Residual stress; Strain (Mechanics); Structural analysis; Temperature; Theory
• Uncontrolled Terms: Horizontal curvature
• Old TRIS Terms: Curved steel girders; Plastic theory; Strains
• Subject Areas: Bridges and other structures; Highways;

Filing Info

• Accession Number: 00209257
• Record Type: Publication
• Files: TRIS
• Created Date: Aug 26 1970 12:00AM