A-A-50104B
2. SALIENT CHARACTERISTICS.
2.1 Design and construction. Racks shall consist of the following steel components; removable wire mesh deckling (for style A racks), upright frame posts, shelf beams with safely locks, cross braces for front-to rear post support, back-to-back connectors, leveling shims, and floor bearing plates. The pallet rack components may be manufactured from hot-rolled steel, or cold-formed steel. The design of all hot-rolled steel components shall conform to the American Institute of Steel Construction (AISC), Manual of steel Construction Allowable Stress Design. Cold-formed steel components shall conform to the American Iron and Steel Institute (AISI), Cold-formed Steel Construction Manual. The load bearing components shall be designed for easy side-to-side rack assembly during rack erection without the use of special tools. These components shall be constructed to produce a rigid and stable rack capable of withstanding a minimum shelf load of 6,000 pounds. The upright frame unit for size 1 and size 3 racks shall have a minimum load capacity of 24,000 pounds and size 2 and size 4 racks shall have a minimum load capacity of 31,000 pounds. An assembled rack unit shall consist of two upright frames attached to three shelf units. All steel components shall be galvanized in accordance with ASTM A 123.
2.2 Upright frame. The upright frame shall be welded construction and shall consist of two vertical posts, minimum 3-inch by 3-inch box channel or tabular column. For tension members, the posts shall be braced by a minimum of five braced panels consisting of “X” type bars. For compression members, the posts shall be braced by a minimum of five braced panels consisting of diagonal angles or channels or braced shall be located between two horizontal bars for each brace and the posts shall be secured to the floor bearing plates. Frames shall be interchangeable in any assembled position. Each post shall have openings to accommodate shelf-beam connectors at corresponding heights. The upright frames shall be from 204 to 207 inches high, and shall all be of equal length. Intermediate upright frame units shall be approximately 180 inches high with a minimum of two bracing panels (see 5.2).
2.3 Shelf unit. The shelf unit shall consist of two 108 inch long load beams for the size 1 racks, two 111 inch long beams for the size 2 racks, two 96 inch long beams for the size 3 racks, and two 120 inch long beams for the size 4 racks. The ends of the beam shall have a multiple prong slip fit connector to easily fasten to post openings. Each beam-to-post connector shall have a safety lock which will lock the beam to the posts. The beams shall be 4 to 5 inches high 2-1/2 to 3 inches.
2.3.1 Front to rear shelf supports. Each shelf unit of the style B rack shall be provided with four front-to-rear supports, a minimum of 3 inches wide by 1-5/8 to 2 inches deep. Each front-to-rear support bar shall fit within a 42 inch upright frame and shall withstand a minimum safe load of 1500 pounds. Front to rear supports shall be prevented from lateral movement by means of a formed tab or mechanical connection that locks into slots punched in the shelf beams, or by overlap flanges that are mechanically fastened to the beams.
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