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  • 1.  Drift

    Posted 11-08-2023 10:30 AM

    What are the Load Combinations used to verify the drift limits.



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    Vijaya Saidu R.Eng, M.ASCE
    Civil and Structural Engineer
    Chaguanas
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  • 2.  RE: Drift

    Posted 11-09-2023 10:39 AM

    ASCE 7, Commentary Commentary for Appendix C has a good discussion of wind drift.  It gives recommended load combinations, including recommendations for appropriately reduced wind speeds for this service check.



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    Brian Carlisle P.E., M.ASCE
    Professional Engineer
    Haughton LA
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    Original Message


  • 3.  RE: Drift

    Posted 11-09-2023 04:18 PM
    Thank You,

    How about the seismic Drifts.

    On Thu, Nov 9, 2023 at 11:41 AM Brian Carlisle via ASCE Collaborate <Mail@...> wrote:
    ASCE 7, Commentary Commentary for Appendix C has a good discussion of wind drift.  It gives recommended load combinations, including... -posted to the "Integrated Buildings & Structures" community
    American Society of Civil Engineers

    Integrated Buildings & Structures

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    Re: Drift
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    Nov 9, 2023 10:39 AM
    Brian Carlisle

    ASCE 7, Commentary Commentary for Appendix C has a good discussion of wind drift.  It gives recommended load combinations, including recommendations for appropriately reduced wind speeds for this service check.



    ------------------------------
    Brian Carlisle P.E., M.ASCE
    Professional Engineer
    Haughton LA
    ------------------------------
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    Original Message:
    Sent: 11/9/2023 9:34:00 AM
    From: Brian Carlisle
    Subject: RE: Drift

    ASCE 7, Commentary Commentary for Appendix C has a good discussion of wind drift.  It gives recommended load combinations, including recommendations for appropriately reduced wind speeds for this service check.



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    Brian Carlisle P.E., M.ASCE
    Professional Engineer
    Haughton LA
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  • 4.  RE: Drift

    Posted 11-11-2023 02:28 PM

    For seismic drift, see AISC 7-16 Section 12.8.6.



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    Brian Carlisle P.E., M.ASCE
    Professional Engineer
    Haughton LA
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    Original Message


  • 5.  RE: Drift

    Posted 11-11-2023 02:28 PM

    You can also find the explanation of the seismic drift in the commentary section.



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    Richard Ochotorena P.E., M.ASCE
    Architectural Profiles Limited NZ
    Hamilton
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    Original Message


  • 6.  RE: Drift

    Posted 11-12-2023 11:00 AM

    Dear Vijaya, seismic drifts are evaluated with non-reduced seismic loads (without R) for the Colombian case. You can use load combinations (including seismic load case), but vertical loads, by nature, will reduce lateral displacement. A conservative way to evaluate drifts is only considering the non-reduced response spectrum.
    Regards,
    AG



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    Andres Guzman D.Eng., MEng, Ing., M.ASCE
    Associate Professor
    UNIVERSIDAD DEL NORTE
    Barranquilla
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    Original Message


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