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Re: "X" Bracing

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Wind always governs over seismic on typical metal buildings- at least in
Zone 4.

Stan Scholl, P.E.
Laguna Beach, CA 

On Thu, 24 May 2001 22:25:29 -0700 (PDT) ijr <issajr(--nospam--at)yahoo.com> writes:
> Limitations against all tension X bracings are valid
> for building more than 3 stories high. Your structure
> being in zone 4, I suggest you add some redundancy in
> your system. Watch that Rods are known to yield during
> large earthquakes.
> 
> 
> --- Larry Hauer <lrhauer(--nospam--at)earthlink.net> wrote:
> > I have been asked to provide engineering services
> > for the expansion of an older prefab metal building
> > with existing "X" braced tie rods for the lateral
> > load carrying system. Somewhere I remember hearing
> > the this type of lateral resisting system has fallen
> > out of favor, and that tension only "X" bracing may
> > no longer be allowed, although I couldn't find any
> > such restriction during a quick look in the 1997
> > UBC. Does anyone have any information on "tension
> > only" "X" bracing in seismic zone 4?
> >  Thanks in advance,
> > 
> >  Larry Hauer, S.E.
> > 
> > 
> 
> 
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