BEHAVIOR OF BOLTED JOINTS WITH OVERSIZE OR SLOTTED HOLES

TWENTY-ONE BOLTED JOINTS WERE TESTED TO DETERMINE THE EFFECT OF OVERSIZED OR SLOTTED HOLES ON THE SLIP BEHAVIOR AND ULTIMATE STRENGTH OF BOLTED JOINTS. HOLE SIZES STUDIED HAD STANDARD 1/4 IN., AND 5/16 IN. CLEARANCES. SLOTS PARALLEL AND TRANSVERSE TO THE LINE OF LOAD WERE STUDIED, ALL JOINTS WERE FABRICATED FROM A36 STEEL PLATE AND FASTENED BY 1 IN. A325 BOLTS. ALSO STUDIED WAS THE NEED FOR WASHERS FOR OVERSIZE HOLES AND CHANGES IN BOLT TENSION. FOR HOLES WITH 1/4 IN. CLEARANCE THERE WAS NO DECREASE IN THE SLIP COEFFICIENT, EXCESSIVE LOSS IN BOLT TENSION, OR INADEQUATE PRELOAD. THE STUDIES INDICATED THAT A WASHER IS DESIRABLE UNDER THE TURNED ELEMENT TO PREVENT SEVERE GALLING. A DECREASE IN THE SLIP COEFFICIENT WAS OBSERVED FOR THE JOINTS WITH 5/16 IN. HOLE CLEARANCE AND FOR THOSE WITH SLOTTED HOLES. SLOTTED HOLES PERPENDICULAR TO THE LINE OF LOAD DID NOT DECREASE THE ULTIMATE STRENGTH OF THE JOINTS. /AUTHOR/

  • Supplemental Notes:
    • Hpr-1/4/, 318.3, 9779
  • Corporate Authors:

    Lehigh University

    Bethlehem, PA  USA  18015

    Pennsylvania Department of Highways

    400 North Street
    Harrisburg, PA  USA  17120-0095
  • Authors:
    • Allan, R N
    • Fisher, J W
  • Publication Date: 1967-8

Subject/Index Terms

Filing Info

  • Accession Number: 00215861
  • Record Type: Publication
  • Source Agency: Bureau of Public Roads /US
  • Files: TRIS
  • Created Date: Jan 8 1994 12:00AM