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1997 UBC Masonry Wall Design

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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