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Reduction of Elastic Response Parameters for design ...

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CBC section 1631.5.4:  "..... with the limitation that in no case shall the elastic response parameters be reduced such that the corresponding design base shear is less than the Elastic Response Base Shear divided by the value of R."
 
Question:
a. When would the above statement apply and supersede items 1, 2, 3 under section 1631.5.4
b. Why would someone scale forces, moments, displacements and then determine the "corresponding design base shear" ... rather than scale elastic response base shear to the base shear determined in accordance with section 1630.2 and then determine corresponding scaled forces, moments, displacements, etc.
c. If the Elastic Response Base Shear (base shear obtained from response spectrum analysis without any scaling up or down) turns out to be higher than the base shear determined in accordance with section 1630.2 ... am I wrong to scale down the Elastic Response Base Shear to 90% (or 80% or 100% per sub-items 1, 2, 3) of the base shear determined in accordance with section 1630.2?
 
Thank you for your comments.
TVG


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