Steel "Special" Cantilevered Column vs. "Ordinary" Cantilevered Column

[chamokinawan]

What is the difference between the special cantilevered steel column and ordinary cantilevered steel column? It's in the ASCE 7-10 Table 12.2-1.G. I cannot use ordinary in SDC D, E, and F, so I always use special which gives me a better R-value, also. But what distinguishes special? If it's in detailing, please, give me an example. Thank you.

 

[wannabeSE]

See the Seismic Provision for Structural Steel Buildings, AISC 341, for the special cantilever column requirements. It is a free download at

https://www.aisc.org/content.aspx?id=2884#seismic