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Sloped Column

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Hello All

I have an 8 stories steel structure
in a high seismicity area for design, the architect used 4 sloped columns 
at the exterior walls, these unconventional columns are angled to create 
open spaces.

I know that for some systems like
diagrid, the building code requires that sloped column should remain elastic 
 during a seismic event, therefore, the response modification factor, R, is
required to be in the range of 1.0 to 1.5 but am I required to use these 
values for my case too?  As I have just 4 sloped columns surrounding my 
structure and others are vertical (the system is an intermediate moment).

Best Regards,

Behnam Heydari

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