COLUMN AISC STANDARDS IN STRUCTURES BASIC INFORMATION


Built-up columns shall satisfy the requirements of AISC Specification Section E6 except as modified in this Section. Transfer of all internal forces and stresses between elements of the built-up column shall be through welds.

1. I-Shaped Welded Columns
The elements of built-up I-shaped columns shall conform to the requirements of the AISC Seismic Provisions. Within a zone extending from 12 in. (300 mm) above the upper beam flange to 12 in. (300 mm) below the lower beam flange, unless specifically indicated in this Standard, the column webs and flanges shall be connected using CJP groove welds with a pair of reinforcing fillet welds. The minimum size of fillet welds shall be the lesser of 5/16 in. (8 mm) or the thickness of the column web.

2. Boxed Wide-Flange Columns
The wide-flange shape of a boxed wide-flange column shall conform to the requirements of the AISC Seismic Provisions. The width-to-thickness ratio (b/t) of plates used as flanges shall not exceed 0.6 SQRT(Es /Fy), where b shall be taken as not less than the clear distance between plates.

The width-to-thickness ratio (h/tw) of plates used only as webs shall conform to the provisions of Table I–8–1 of the AISC Seismic Provisions. Within a zone extending from 12 in. (300 mm) above the upper beam flange to 12 in. (300 mm) below the lower beam flange, flange and web plates of boxed wide-flange columns shall be joined by CJP groove welds. Outside this zone, plate elements shall be continuously connected by fillet or groove welds.

3. Built-up Box Columns
The width-to-thickness ratio (b/t) of plates used as flanges shall not exceed 0.6#Es /Fy #, where b shall be taken as not less than the clear distance between web plates.

The width-to-thickness ratio (h/tw) of plates used only as webs shall conform to the requirements of the AISC Seismic Provisions. Within a zone extending from 12 in. (300 mm) above the upper beam flange to 12 in. (300 mm) below the lower beam flange, flange and web plates of box columns shall be joined by CJP groove welds. Outside this zone, box column web and flange plates shall be continuously connected by fillet welds or groove welds.

4. Flanged Cruciform Columns
The elements of flanged cruciform columns, whether fabricated from rolled shapes or built up from plates, shall meet the requirements of the AISC Seismic Provisions.

User Note: For flanged cruciform columns, the provisions of AISC Specification Section E6 must be considered. Within a zone extending from 12 in. (300 mm) above the upper beam flange to 12 in. (300 mm) below the lower beam flange, the web of the tee-shaped sections shall be welded to the web of the continuous I-shaped section with CJP groove welds with a pair of reinforcing fillet welds.

The minimum size of fillet welds shall be the lesser of 5/16 in. (300 mm) or the thickness of the column web. Continuity plates shall conform to the requirements for wide-flange columns.

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