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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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This note was uploaded on 03/30/2008 for the course ARC 322 taught by Professor Mcgavin during the Winter '08 term at Cal Poly Pomona.
- Winter '08