SERVICE HISTORIES AND LABORATORY TESTING

THE NEED FOR ACQUISITION OF STRAIN HISTORIES OF ACTUAL BRIDGE STRUCTURES IS DESCRIBED TO ESTABLISH THE EXPECTED NUMBER AND MAGNITUDES OF THE LOAD CYCLES. THIS IS NECESSARY TO ASSIST IN THE SELECTION OF CYCLE LIVES AND DESIGN STRESS LEVELS. SEVERAL FACTORS ARE DESCRIBED THAT AFFECT THE STRAIN HISTORY INCLUDING STRESS HISTORY, ENVIRONMENT, AND MATERIAL CONDITIONS. MANY OF THESE FACTORS HAVE BEEN STUDIED IN THE LABORATORY UNDER UNIFORM CYCLIC LOADING. HOWEVER, THIS DOES NOT FORECAST THE SERVICE LIFE OF A STRUCTURE WITH ANY CONFIDENCE. THE VARIOUS TYPES OF SERVICE LOAD SIMULATIONS ARE DESCRIBED. THEY INCLUDE LOCK OR PROGRAMMED LOADING, RANDOM PROCESS GENERATED LOADS, AND LOADS GENERATED BY MAGNETIC TAPE RECORDINGS. IT IS NOTED THAT MANY PROBLEMS ARE ENCOUNTERED WHEN INTERPRETING THE MEASURED LOAD HISTORIES AND ATTEMPTING TO CORRELATE THEM TO CONSTANT CYCLE TESTS AND TO DESIGN CONDITIONS. /AUTHOR/

• Supplemental Notes:
  • Vol 94, No ST 12, PROC PAPER 6287, PP 2699-2712
• Authors:
  • Reemsnyder, H S
  • Fisher, J W
• Publication Date: 1968-12

Media Info

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

Subject/Index Terms

• TRT Terms: Bridge design; Bridges; Design load; Service life; Simulation; Strain measurement; Stresses; Structural design
• Subject Areas: Bridges and other structures; Design; Highways;

Filing Info

• Accession Number: 00208929
• Record Type: Publication
• Files: TRIS
• Created Date: Jun 2 1994 12:00AM