A steel joist system will have a design span of 24 ft. The floor (concrete topping on steel decking) and ceiling (suspended ceiling, lights, ductwork, etc.) systems have a combined dead load of 70 lb/ft2. Assume a live load of 100 lb/ft2. Deflection for the live load should not exceed ℓ/360 of the span.
(a) Select the lightest K-series joist designation that can safely carry the load at a joist spacing of 12 in.
(b) Select the lightest K-series joist designation that can safely carry the load at a joist spacing of 16 in.
(c) Select the lightest K-series joist designation that can safely carry the load at a joist spacing of 24 in.
(d) Assuming that the joists are repetitively placed in a masonry building that measures 24 ft × 32 ft, determine the number of joists required for each spacing.
(e) Determine the lightest joist system.
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