BEHAVIOR OF BEARING CRITICAL DOUBLE-ANGLE BEAM CONNECTIONS

An evaluation of the application of the Canadian Standards Association's newly recommended higher bolt shear and bearing stresses was made with several tests of bolted double-angle beam connections, with top flanges both coped and uncoped. The findings are summarized as follows: 1) The presence of the top flange of a beam is important for the development of the web bearing strength derived from tests of tensile lap splices. 2) The effect of eccentricity on short, single line, bolted web connections may cause a high component of force towards the end of the beam and thus the critical dimension related to potential tear out would be the horizontal distance from the bolt line to the end of the beam. 3) For beams in which the top flange is coped, a potential failure mode of tearing out may occur in the web before the nominal ultimate bearing stress is attained; an intuitive failure model which was also observed in the tests shows reasonable agreement with the tests results reported herein. 4) Although the study presented here focuses primarily on ultimate load behavior, permanent or residual deformation at service loads attributable to bearing deformation may be unsuitable. For the uncoped beam test, the residual displacment at a working load is estimated to be on the order of 0.1-0.2 in. The test results, which are presented here, focus on the behavior of only one connection with two detailing alternatives (coped and uncoped). For many framing applications, the loading and detailing practice may be such that proportions which develop the failure mechanism demonstrated here will not occur. It is, however, prudent to exercise caution in the application of the new bearing strength criteria to the wide variety of connection detailing for which the criteria have not been tested. It is further recommended that research be continued to develop design guidelines for the broader application of ultimate strength concepts in connection design. /Author/

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  • Corporate Authors:

    American Institute of Steel Construction

    101 Park Avenue
    New York, NY  USA  10017
  • Authors:
    • Birkemoe, P C
    • Gilmor, M I
  • Publication Date: 1978

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 190-115
  • Serial:
    • Engineering Journal
    • Volume: 15
    • Issue Number: 4
    • Publisher: American Institute of Steel Construction
    • ISSN: 0013-8029

Subject/Index Terms

Filing Info

  • Accession Number: 00194157
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 11 1979 12:00AM