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  1. trac

    API RP 2A WSD 22nd Edition

    Good to see that API 22nd Edition has clarified as to what AISC manual of construction to be used for WSD design of open sections i.e AISC 335-89 and not AISC 360-10. Their statement that AISC 369-10 is not to be used for design substantiation would imply that do not recoomend it for LRFD design...
  2. trac

    STAAD.PRO V8 - AISC LRFD Code Check Cm values used in calculating Beta 1 factors

    Have asked STAAD as to how or what Cm values are used when calculating BETA1 factors used in code checking to AISC LRFD (For API LRFD code check, cm values can be input manually as for the 9th edition code check), - As yet no response from STAAD (3 weeks now). I assunme that cm values are...
  3. trac

    AISC 14 th Edition - Combined Member Capacities Limits

    For combined member capacities the 14th Edition uses Eq H1-1a nd 1b but no limiting equation as per the 9th Edition i.e Eq H1-2. Checking some columns that have H1-1a < 1.0 but reviewing capacities based on combined stress gives a resultant stress exceding Yield. Structure is a no sway frame...
  4. trac

    AISC Software

    I am looking for a stand alone software package that can check beam elemnts to AISC (WSD & LRFD) and particularly fabricated box sections with slender elemnts. e.g web h/tw = 120 flange b/tf = 55. I have used STAAD for a code check but my hand calcs give a different IR. Would like to do a third...
  5. trac

    Seismic Rules/Specification/Guidelines

    For a new build steel structure - is there a hierarchal structure when using/referencing building codes/specfications e.g. First apply IBC (UBC?)rules then AISC and/or ASCE seismic provisions then FEMA specifications and finally NEHRP guidelines or are they generally equal in application as...
  6. trac

    Superceded FEMA regulations

    I am not sure as to what FEMA documnts I should be conversant with for new building design. Is there a priority in the FEMA regs e.g. Can I use 450 alone or do I need to refer to other FEMA documents as well e.g. 302, 350, 357 etc. Some of the FEMA documents appear to have the same content but...

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