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2003 IEBC vs 1997 UCBC URM shear wall capacity

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Why is the equation for rocking shear capacity Vr = 0.5*PD*D/H in the UCBC and Vr = 0.9*PD*D/H in the IEBC?  From a statics standpoint the UCBC is the correct formula, isn't it?  Also PD is defined in both as "...dead load at the top of the pier under consideration..."  Why wouldn't you use the self weight of the wall acting at the centroid to resist rocking as well?
Marc Mitchell