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Re: Alterations Chapter 34 2007 CBC

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There seems to be no recognition of the possibility that the element being "weakened" might have had, say, 20% greater capacity than required for the original design.


In a message dated 5/15/08 10:18:42 AM, jeffsmith7(--nospam--at) writes:
I am interpreting section 3403.2.3.2 to require that an entire building
needs to be seismically upgraded if any seismically resisting element has
its strength reduced by more than 10%. In the case of a concrete shearwall
flexible diaphragm building, if you punch a whole in an exterior shear wall
and reduce the strength by 10% you have to upgrade the whole building, not
just the altered shear wall or do the exceptions 1-4 allow just the altered
wall to be strengthend?



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