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RE: Slender Masonry Walls, Again

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The load factors are not based on material properties. ACI has just been
slow to catch up the rest of the world. The LRFD Steel factors are on par
with the masonry factors. The material variations are picked up in the phi

> -----Original Message-----
> From: Kipp Martin [mailto:KAMartin(--nospam--at)]
> Sent: Tuesday, April 27, 1999 8:17 AM
> To: seaint(--nospam--at)
> Subject: Slender Masonry Walls, Again
> Thanks to all who responded to my original post.  Now another
> question.  The load factors given in the 97 UBC for strength
> design of masonry are smaller than those normally used for
> concrete.  In my opinion, masonry is subject to larger
> variations in constructed quality than concrete.  I know that
> the phi factor is used to account for material quality, but
> the difference of 0.8 for masonry and 0.9 for concrete does
> not seem like enough, especially with the lower load factors.
>  Should the load factors for concrete be used? Should a lower
> phi factor be used?  Both?  I'm leaning toward using the
> concrete load factors.