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Steel Structures in very Cold Climates

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My practice is to define the steel grade so brittle fracture can be avoided then use conventional design methods. 
Main Structural Members:  ASTM A573, A588, A633 or CSA G40.21 44T and 50T
Cold Form sections to ASTM A607 or A570
HSS Sections to ASTM A500 (modified for impacts) or CSA G40.21, 50T and 50A
Foundations: ASTM A252 Grade 3 modified for impacts.
Also avoid executing critical welded connections in the field , use bolted connection with Structural bolts to ASTM A320.
B.Davison, P.Eng.
RND Engineering Ltd.
Edmonton, Alberta