Discussion: View Thread

  • 1.  use of dottie bolts

    Posted 10-26-2017 12:23 PM

    Can the working  stress values for this bolt be increased 33% for wind or EQ?



    Bahman kher – SE


  • 2.  RE: use of dottie bolts

    Posted 10-30-2017 12:43 PM
    ​I think your question is in regard to products made by LH Dottie Company that makes all kinds of fasteners.

    It doesn't make any difference who manufactures the fasteners you are specifying with regard to allowable stress increases it matters that the fastener is specified correctly by ASTM.  Whatever code you are using that allows a 1/3 increase should also specify what types of fasteners are acceptable to the code either directly or through manufacturer test reports (ICC-ES) etc.  If the ASTM (or test report) for your fastener isn't acceptable for the code then the question of allowable stress increase isn't relevant. You shouldn't use the fastener.

    If the fastener is acceptable for the code then using the stress increases allowed by code is valid.

    Of course many of us have had situations that don't fit into the codes very well such as doing seismic design for fastening cabinets to walls in a retail space where the typical fasteners are not what we usually consider "structural". I think in these cases one has to make reasonable judgements and provide the best design you can.

    Brett King P.E., M.ASCE
    Senior Structural Engineer
    GHD Inc.
    Lake Oswego OR