STUDY OF FATIGUE OF HYBRID PLATE GIRDERS UNDER CONSTANT MOMENT

FATIGUE TESTS OF FOUR HYBRID PLATE GIRDERS COMPRISED OF ASTM A514 STEEL FLANGES AND ASTM A36 STEEL WEB UNDER CONSTANT MOMENT CONDITION ARE REPORTED. FOR ALL THE GIRDERS THE WEB WAS 36 IN. DEEP. TWO GIRDERS HAD A SLENDERNESS RATIO OF 197 WHILE THE SAME FOR THE OTHER TWO WAS 267. ALL FOUR GIRDERS WERE SUBJECTED TO A STRESS RANGE OF 30 KSI WITH A MAXIMUM APPLIED STRESS OF 50 KSI. THE PURPOSE OF THIS INVESTIGATION WAS TO COLLECT NECESSARY DATA TO STUDY THE BEHAVIOR OF HYBRID PLATE GIRDERS IN THE REGION OF HIGH STRESS RANGE AND RELATE THE RESULTS WITH THE AVAILABLE TEST DATA IN LOWER STRESS RANGES. THE TEST RESULTS ARE PRESENTED AND DISCUSSED IN COMPARISON WITH PREVIOUS TEST DATA. A LIMITED STATISTICAL ANALYSIS IS MADE IN AN ATTEMPT TO FIND THE INFLUENCE OF PARAMETERS WHICH AFFECT THE FATIGUE LIFE OF HYBRIDE PLATE GIRDERS. SEVERAL DESIGN CRITERIA BASED ON THE TEST RESULTS AND EMPIRICAL ANALYSES ARE SUGGESTED. TEST RESULTS SHOWED THAT BY LIMITING CERTAIN VARIABLES, THE SECONDARY BENDING STRESSES IN THE WEB CAN BE REDUCED SO THAT THEIR EFFECT WILL NOT BE ENOUGH TO PRODUCE FATIGUE CRACKS IN THE COMPRESSION SIDE OF THE GIRDERS. HOWEVER, CRACKS WILL APPEAR IN THE TENSION SIDE DUE TO OTHER FACTORS SUCH AS NOTCHES DUE TO FABRICATION AND VARIOUS STRESS CONCENTRATIONS. /AUTHOR/

• Corporate Authors:

  University of Texas, Austin

  Cockrell Hall
  Austin, TX  United States  78712

  Texas State Department of Highways & Public Transp

  11th and Brazos Streets
  Austin, TX  United States  78701

  Bureau of Public Roads /US

  400 7th Street, SW
  Washington, DC  United States  20590
• Authors:
  • Yinh, J
  • Toprac, A A
• Publication Date: 1969-1

Subject/Index Terms

• TRT Terms: Bending; Bending stress; Cracking; Design; Fatigue (Mechanics); Fatigue tests; Flanges; Plate girders; Statistical analysis; Steel; Stresses; Structural analysis; Thinness; Webbing
• Uncontrolled Terms: Design criteria; Fatigue life; Hybrids; Slenderness ratio; Stress concentration
• Subject Areas: Bridges and other structures; Data and Information Technology; Design; Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00207899
• Record Type: Publication
• Source Agency: Bureau of Public Roads /US
• Report/Paper Numbers: Hpr 96
• Files: TRIS, STATEDOT
• Created Date: Mar 18 1994 12:00AM