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  • 1.  Alternate Design Provisions for Diaphragms including Chords and Collectors

    This message was posted by a user wishing to remain anonymous
    Posted 02-14-2023 07:57 AM
    This message was posted by a user wishing to remain anonymous

    I believe there is a typo in the ASCE/SEI 7-22, Eq. 12.10-8.  Would someone please verify?

    Alternative design provisions for diaphragms, including chords and collectors states that the design acceleration coefficient, Cpi = 0.8 Cpo.  Based on the research reports and FEMA examples, the '0.8' should not be in the equation.  Do you agree?


    #ASCE7-22
    #Seismic
    #Errata


  • 2.  RE: Alternate Design Provisions for Diaphragms including Chords and Collectors

    Posted 02-16-2023 01:56 PM

    It appears you may be correct.  Members of the ASCE 7 seismic committee are reviewing this but the history is quite long and dates back to 2014 (when the Provisions were first consdiered). I hope to provide a more helpful response soon.



    ------------------------------
    Ronald Hamburger, SE
    Consulting Principal
    Simpson Gumpertz & Heger
    ------------------------------

    Original Message


  • 3.  RE: Alternate Design Provisions for Diaphragms including Chords and Collectors

    Posted 02-17-2023 07:19 PM

    I have now confirmed that the 0.8 factor in Eq. 12.10-8 is in error.  ASCE will be issuing an errata to both ASCE 7-16, where the formula originally appeared and also ASCE 7-22 where it also appears to correct this  Thank you for being diligent in your review and sending the message over the forum.



    ------------------------------
    Ronald Hamburger, SE
    Consulting Principal
    Simpson Gumpertz & Heger
    ------------------------------

    Original Message


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