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Re: 1997 UBC Masonry Wall Design

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OK for wall design but If you have a flexible diaphragm, ap is 1.5 for
connections. 1633.2.8.1, Item 1

Bill Allen wrote:

> Maybe I've got this all screwed up, but I am designing a masonry wall
> (laterally supported at the roof).
>
> Let's say:
>
> Na=1.00
> Soil Type SD
> Ca=0.44*1.0=0.44
> Ip=1
>
> Based on Table 16-O:
> ap=1.0 & Rp=3.0
>
> Using Eqn 32-2:
>
> at the base of the wall, hx=0 and (1+3hx/hr)=1
>
> Fp=1.0*0.44*1*1/1.4=0.136*Wp (working stress design)
>
> and at the roof level hx=hr and (1+3hx/hr)=4
>
> Fp=4*0.136=0.544*Wp
>
> giving an average Fp=(0.136+0.544)/2=0.340*Wp
>
> I guess this is pretty close to the 1994 value of 0.40*.75=0.30Wp.
>
> Corrections, anyone?
>
> Bill Allen, S.E.
> ALLEN DESIGNS
> Laguna Niguel, CA