A steel joist system will have a design span of 32 ft. The roof (membrane, insulation, and deck) and ceiling (suspended ceiling, lights, ductwork, etc.) systems have a combined dead load of 20 lb/ft2. Assume a live load of 30 lb/ft2. Deflection for the live load should not exceed ℓ/360 of the span. Due to the structural properties of the metal roof deck, a joist spacing of 5 ft is under consideration.
(a) Select the lightest K-series joist designation that can carry the load safely regardless of depth.
(b) Due to headroom requirements and material costs associated with building envelope height, joist depth should not exceed 20 in. Select the lightest K-series joist designation that can carry the load safely and not exceed 20 in. in depth.
(c) With the steel joists selected in parts a and b, determine the bridging requirement.
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