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Re: torsion...one more time but with different "twist"

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Not having sat on the committee(s), I am only speculating:  Could it be that
torsional irregularities can exist/occur on a "localized" story by story
basis, due to discontinuities in framing, thus interstory drifts are the
appropriate parameter to evaluate; whereas torsional amplification is a
function of "global" response, thus displacements relative to the base are
the parameter to be considered?

Mark D. Anderson  PE


----- Original Message -----
From: "Dave Evans" <DEvans(--nospam--at)tnh-inc.com>
To: <seaint(--nospam--at)seaint.org>
Sent: Tuesday, October 02, 2001 11:42 AM
Subject: torsion...one more time but with different "twist"


> If anyone could give me some names and numbers of people who
> can answer this question, I'd appreciate it very much.
>
> Dave
>
>
> ------- Forwarded message follows -------
> From:           Dave Evans <DEvans(--nospam--at)tnh-inc.com>
> To:             seaint(--nospam--at)seaint.org
> Subject:        torsional amplification factor oddity
> Date sent:      Fri, 28 Sep 2001 12:19:37 -0900
>
> Hello,
>
> Does anyone know the rationale for using story *drifts* to check for
> torsional irregularity, whereas building *displacements* are used to
> calculate the torsional amplifaction factor?  Why aren't drifts used
> to calculate the amplification factor, too? (Or...why aren't
> displacements used to determine whether there is an irregularity?)
>
> As codified, although the drifts may indicate torsional irregularity,
> the displacements may be such that there is no amplification
> (which seems slightly odd.)
>
> Thanks,
> Dave Evans, P.E.
> TNH, Inc.
> ------- End of forwarded message -------
>
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