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Primary Members

Primary framing shall include tapered beam frames, tapered rigid frames, modular beam and columns, lean-to rafters and columns, canopy beams, intermediate columns, bearing end frames and end wall columns.

Steel used in the fabrication of built-up primary structural members shall have a minimum yield of 50 ksi. Hot rolled primary structural members shall have a minimum yield of 50 ksi. Cold rolled structural members shall have a minimum yield of 55 ksi.

Primary framing shall be shop fabricated and include all holes required for attachment of secondary members and bracing. Flanges and webs of built-up welded members shall be joined by a continuous automatic submerged arc-welding process. End wall columns and rafters shall be built-up "I" sections, structural mill shapes or cold rolled members.