If a column is not framed with solid web structural members in two or more directions and steel joists are used, a joist must be field-bolted at the column for lateral stability during erection. Each column then needs a vertical stabilizer plate of at least 6 by 6 inches reaching 3 inches or more below the bottom chord, with a 13/16-inch hole for guying or plumbing cables; bottom chords at columns are stabilized against rotation; and hoisting cables stay on until both seats are field-bolted and each bottom chord end is restrained by the plate. Where constructibility prevents a column joist, an equivalent alternate stabilizer, designed by a qualified person, shop installed and shown on the erection drawings, is fitted on each side close to the column, and cables stay on until both seats are bolted and the joist stabilized. Joists at or near columns spanning 60 feet or less must be designed so one employee can release the hoisting cable without erection bridging; longer ones are erected as fully bridged tandem pairs unless a qualified person designs an equivalent method that the site-specific erection plan incorporates. Joists and joist girders go only on stabilized supports, are secured once landed, and never get strength-affecting modifications without the engineer of record's approval. In bays of 40 feet or more, individual joist connections (not pre-assembled panels) are made for, and receive, field bolting unless constructibility prevents it. Using joists or joist girders as fall arrest anchorages needs a qualified person's written approval. A bridging terminus point precedes bridging, with temporary ones where permanent points cannot serve. Each end of K-series joists is attached with at least two 1/8-inch fillet welds 1 inch long or two 1/2-inch bolts, or equivalent; LH and DLH joists and joist girders with at least two 1/4-inch fillet welds 2 inches long or two 3/4-inch bolts, or equivalent. As soon as each joist reaches final position, and before the next is placed, both sides of the seat are attached at one end or more; pre-assembled panels are attached at each corner before cables are released. Joists needing bridging under Tables A and B (spans by joist designation; NM means not mandatory) have both sides of one end's seat attached before release; joists over 60 feet have both ends attached and paragraph (d) met first. Where the tables require no erection bridging, a single employee at most may be on the joist before every bridging row is in and anchored, and nobody goes on joists at or beyond the table span except under paragraph (d). At or beyond the table span, one row of bolted diagonal erection bridging near midspan is installed and anchored before release, with one employee at most on the span until the rest is anchored. Over 60 through 100 feet, all bridging is bolted diagonal, two rows near the third points are installed and anchored before release, and at most two employees are allowed until the rest is anchored. Over 100 through 144 feet, all bridging is bolted diagonal and all of it is anchored before release, with at most two employees on the span meanwhile. Spans over 144 feet follow 1926.756. Bottom chord bearing joists in these categories also need bolted diagonal bridging near the supports, anchored before release. Required erection bridging is shown on the erection drawing, the sole guide to its placement, bolts through shop-installed clips or equivalents, keeps the first piece's nut on a shared bolt while the second is added, and never projects above the top chord. Whoever places loads on joists spreads them within each joist's capacity, and no construction load goes on before all bridging is anchored and all bearing ends attached, except decking bundles meeting paragraph (e)(4). Bridging bundles may weigh at most 1,000 pounds and sit across three or more joists secured at one end, with the bundle edge within 1 foot of that end. A decking bundle may go on before full bridging only if a qualified person has determined, and the site-specific erection plan documents, that the structure can carry it; it spans at least three joists attached at both ends; at least one bridging row is anchored; and it weighs 4,000 pounds or less. The edge of any construction load, a decking bundle included, lies within 1 foot of the bearing surface at the joist end.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.