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Re: wood frame bldg deformation and windows

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No, non-conformance with the building code is NOT a non-issue.  From the
calc's I've done on wood shear walls, the magnitude of the drift may be the
non-issue.  IIRC, the drift calculations for wood shear walls are somewhat
imprecise.  Then, how do you quantify the additional stiffness due to the
wall being nailed at 2-7/8" o.c. instead of 3" o.c., or the reduction in
stiffness due to the nails being over-driven?

Since windows are a "non-structural" item, aren't they the responsibility of
the window manufacturer or architect?  Have there been injuries to people
from windows in wood framed buildings that weren't designed (or more
importantly, installed) to accommodate said drift?  It seems that
installation is as critical or more critical than the window design here.

Do we need to look up long enough to see where we're going?

Conrad

----- Original Message -----
From: "Regis King" <steelfishes(--nospam--at)hotmail.com>
To: <seaint(--nospam--at)seaint.org>
Sent: Tuesday, January 08, 2002 5:42 PM
Subject: Re: wood frame bldg deformation and windows


> You think non-conformance with the building code is a "non-issue"?  Seems
a
> little cavalier to me.  I'm sure the difference between 2x and 3x plates
is
> also a bit of a "non-issue", but you won't soon forget the experience of
> inadvertantly specifying 2x plates in a high-seismic area, believe me.
>
> Regis
>
>
> >From: "Conrad Guymon" <conrad(--nospam--at)karren.com>
> >Reply-To: <seaint(--nospam--at)seaint.org>
> >To: <seaint(--nospam--at)seaint.org>
> >Subject: Re: wood frame bldg deformation and windows
> >Date: Tue, 8 Jan 2002 15:35:49 -0700
> >
> >Are the windows the full story height?   If they are not, would it be
> >appropriate to use (window height/story height)*Delta M to obtain the
drift
> >differential between the bottom and top of the window?  Would this reduce
> >the value to something you could handle?  Do you have drift calculations
on
> >the wood shear walls?
> >
> >It sure seems like this is a non-issue.
> >
> >That's my two cents worth.
> >
> >Conrad
> >----- Original Message -----
> >From: "regis king" <steelfishez(--nospam--at)hotmail.com>
> >To: <seaint(--nospam--at)seaint.org>
> >Sent: Tuesday, January 08, 2002 4:42 PM
> >Subject: wood frame bldg deformation and windows
> >
> >
> > > Have any of the list members had to address the effect of seismic
drift
> >on
> > > the windows of a wood frame apartment building? I am not referring to
a
> > > large retail window wall system, but rather typical residential
windows.
> >UBC
> > > 1633.2.4.2 includes "elements that are attached to or enclose the
> >exterior".
> > > Most vinyl windows are attached with vinyl flanges on the outside. I
> >believe
> > > that the vinyl itself has some inherent flexibility, but this is
> >obviously
> > > difficult to quantify. I know that slotted holes can be used. However,
> >the
> > > slotted holes are not likely long enough to meet the code requirements
> >if
> >a
> > > residential window is included in UBC 1633.2.4.2. Note that this same
> > > section requires the greater of Delta M or 0.5 inches. The slot would
> >have
> > > to be 1" + the width of the screw to qualify. I have never addressed
> >this
> > > issue and it has been brought up on one of my jobs.
> > >
> > > Thanks in advance for any help.
> > >
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