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https://nap.nationalacademies.org/catalog/27432/critical-issues-in-transportation-for-2024-and-beyond

BEHAVIOR OF WELDED BUILT-UP BEAMS UNDER REPEATED FLEXURAL LOADS

THE EXPERIMENTAL STUDIES DESCRIBED IN THIS REPORT WERE CONDUCTED TO DETERMINE THE BEHAVIOR OF WELDED FLEXURAL MEMBERS OF THE TYPE USED IN BRIDGE CONSTRUCTION, TO FIND MEANS OF INCREASING THE FATIGUE LIFE OF SUCH WELDED STRUCTURES, AND TO DEVELOP RELATED INFORMATION WHICH WILL ADVANCE THE ART OF BRIDGE DESIGN. FOR THIS PURPOSE, FLEXURAL FATIGUE TESTS WERE CARRIED OUT ON SMALL ALL-WELDED BEAMS FABRICATED FROM A NUMBER OF STEELS RANGING FROM A-373-58T WITH A YIELD POINT OF 32,000 PSI TO A-514-65 WITY A YIELD POINT OF 100,000 PSI. MANUAL ARC WELDING, WITH E-7016 ELECTRODES OR E-11018 ELECTRODES, WHERE APPROPRIATE, WAS USED IN THE FABRICATION OF MOST OF THE SPECIMENS INCLUDED IN THIS REPORT. SEVERAL SPECIMENS WERE FABRICATED WITH THE SUBMERGED ARC WELDING PROCESS FOR COMPARISON PURPOSES. IN ONE PHASE OF THE INVESTIGATION A ROLLED SECTION WAS USED AS THE BASIC ELEMENT OF THE SPECIMEN. INITIAL STUDIES ON THIS PROGRAM WERE CONDUCTED ON BEAMS WITHOUT SPLICES TO INVESTIGATE THE EFFECT OF THE FLANGE THICKNESS TO WEB THICKNESS RATIO. SEVERAL FIELD SPLICE CONFIGURATIONS WERE USED IN THE INVESTIGATION AND STUDIES MADE OF THE DIFFERENCE IN THEIR MODES OF FAILURE AS WELL AS THE DIFFERENCE IN THEIR FATIGUE STRENGTH. THE FIELD SPLICE CONFIGURATIONS WERE TESTED UNDER THE STRESS CYCLES WHICH VARIED FROM ZERO TO A MAXIMUM TENSION, FROM A PARTIAL TENSION TO A MAXIMUM TENSION AND FROM A COMPRESSION STRESS TO AN EQUAL TENSILE STRESS. IN ADDITION TO THE SPLICE STUDY THE INVESTIGATION INCLUDED A STUDY OF STIFFENER DETAILS, A STUDY OF COVER PLATE DETAILS AND A STUDY OF TRANSITIONS IN THE FLANGE THICKNESS OR WIDTH. THE PROGRAM ALSO INCLUDED FATIGUE TESTS ON CONTROL SPECIMENS TO DETERMINE THE FATIGUE STRENGTH OF THE A-373-58T STEEL AS RECEIVED FROM THE MILL AND ALSO WITH BUTT-WELDED JOINTS, EITHER PARALLEL OR PERPENDICULAR TO THE DIRECTION OF STRESS. ALL DETAILS WERE NOT STUDIED FOR ALL OF THE MATERIALS AND ALL FATIGUE STRESS CYCLES. NEVERTHELESS, A SUFFICIENT NUMBER OF TESTS WERE CONDUCTED ON THE SAME DETAIL IN SPECIMENS MADE OF THE DIFFERENT STRENGTH STEELS BUT SUBJECTED TO THE SAME STRESS CYCLE TO PROVIDE A GOOD INDICATION OF THE RELATIVE STRENGTH OF THE VARIOUS STEELS UNDER IDENTICAL CONDITIONS. A SUMMARY OF THE TESTS PERFORMED AND INCLUDED IN THIS REPORT IS PRESENTED IN A TABLE WHICH CONTAINS INFORMATION REGARDING THE NATURE OF THE SPECIMEN, THE BASE MATERIAL, THE TYPE OF DETAIL, THE DEPTH OF THE BEAM, THE WELDING PROCEDURE USED, THE STRESS CYCLE EMPLOYED AND THE NUMBER OF TESTS CONDUCTED. /AUTHOR/

  • Corporate Authors:

    University of Illinois, Urbana-Champaign

    Urbana, IL  United States  61801
  • Authors:
    • STALLMEYER, J E
    • Munse, W H
  • Publication Date: 1966-9

Subject/Index Terms

Filing Info

  • Accession Number: 00207822
  • Record Type: Publication
  • Source Agency: Bureau of Public Roads /US
  • Report/Paper Numbers: Cpr11-7768
  • Files: TRIS
  • Created Date: Mar 20 1994 12:00AM