Washington Administrative Code › Title 296 - Labor and Industries, Department of › Chapter 296-155 - Safety standards for construction work › Part P - STEEL ERECTION › Section 296-155-709 - Open web steel joists

Current through Register Vol. 24-14, July 15, 2024
(1)
General.
(a) Where steel joists
				are used and columns are not framed in at least two directions with solid web
				structural steel members, a steel joist must be field-bolted at the column to
				provide lateral stability to the column during erection.
Exception:
See (b) of this subsection. For the installation of
							 this joist:
(i) A vertical stabilizer plate must be provided on
							 each column for steel joists. The plate must be a minimum of 6 inch by 6 inch
							 (152 mm by 152 mm) and must extend at least 3 inches (76 mm) below the bottom
							 chord of the joist with a 13/16-inch (21 mm) hole to provide an attachment
							 point for guying or plumbing cables.
(ii) The bottom chords of steel joists at columns
							 must be stabilized to prevent rotation during erection.
(iii) You must not release hoisting cables until the
							 seat at each end of the steel joist is field-bolted, and each end of the bottom
							 chord is restrained by the column stabilizer plate.
(b)
				Where constructibility does not allow a steel joist to be installed at the
				column:
(i) You must install an alternate
				means of stabilizing joists on both sides near the column and it must:
* Provide stability equivalent to (a) of this
				  subsection;
* Be designed by a qualified person;
* Be shop installed; and
* Be included in the erection drawings.
(ii) You must not release hoisting cables
				until the seat at each end of the steel joist is field-bolted and the joist is
				stabilized.
(c) Where
				steel joists at or near columns span 60 feet (18.3 m) or less, the joist must
				be designed with sufficient strength to allow one employee to release the
				hoisting cable without the need for erection bridging.
(d) Where steel joists at or near columns
				span more than 60 feet (18.3 m), the joists must be set in tandem with all
				bridging installed unless an alternative method of erection, which provides
				equivalent stability to the steel joist, is designed by a qualified person and
				is included in the site-specific erection plan.
(e) You must not place a steel joist or steel
				joist girder on any support structure unless such structure is
				stabilized.
(f) When steel joist(s)
				are landed on a structure, you must secure them to prevent unintentional
				displacement prior to installation.
(g) You must not make any modification that
				affects the strength of a steel joist or steel joist girder without the
				approval of the project structural engineer of record.
(h) Field-bolted joists.
(i) Except for steel joists that have been
				preassembled into panels, connections of individual steel joists to steel
				structures in bays of 40 feet (12.2 m) or more must be fabricated to allow for
				field bolting during erection.
(ii)
				These connections must be field-bolted unless constructibility does not
				allow.
(i) You must not
				use steel joists and steel joist girders as anchorage points for a fall arrest
				system unless written approval to do so is obtained from a qualified
				person.
(j) You must establish a
				bridging terminus point before bridging is installed. (See Appendix E to this
				part.)