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Unformatted text preview: 2 (includes joist DL) Tributary 292.5 lb/ft – It carries a LL = 15 lb/ft 2 Tributary 97.5 lb/ft – Joists are spaced at 6.5 ft OC – Select the most economical open web joist – NOTE: We do not need to reduce the joist load since the problem statement tells us that the Roof DL includes the weight of the joist. Drawing 2 points Uniform Load each joist = 60 lb/ft 2 x 6.5 ft = 390 lb/ft 26K9 will carry 409 LB/FT = 409 LB/FT > 390 LB/FT … OK 2 points Deflection This is the minimum drawing allowed. If they did better drawings, such as showing the tributary loads, give 1 point EC on each one problem. 26K9 will carry 284 lb/ft > 97.5 lb/ft … OK 2 Points NOTE … If they selected a 30K7 I only weighs 0.1 lb/ft more … so OK...
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- Winter '08
- Open web joist, lb/ft, ft OC Select