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Re: "X" Bracing

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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)> 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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