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UBC '97 Sec 1633.2.4 Deformation compatibilty

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If I am reading this right, this check asks for using the interstory deformation value to be considered as the greater of :

1. DeltaM, as calculated in accordance to Sec 1630.9.2 (0.7*R*DeltaS)

2. 0.025*story height.

When would the first condition govern? The inelastic story drift ratios are limited to max. 0.025.

Am I missing something, or the first condition is redundant?
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Attila Beres