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element-story shear ratio at UBC 1997

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Dear friends:
I got some questions about UBC 1997 proceedings:
- how to obtain r max factor (maximum element-story shear ratio) appearing on UBC Code, Chapter 16, Division IV, Section 1630.1.1e ?
- Does the special seismic load combinations from Section 1612.4 apply to seismic isolated concrete structures design (appendix chapter 16) ?
 
Gratefull,
Leopoldo Sanz Bocarnda