Aug 4, 2018 1 #1 LeonhardEuler Structural Jun 19, 2017 200 Surely it’s because the W18 is less compact against LTB
Aug 4, 2018 #2 BAretired Structural Nov 16, 2008 10,929 Yes, and there are many similar examples. BA Upvote 0 Downvote
Aug 4, 2018 2 #3 SlideRuleEra Structural Jun 2, 2003 5,528 The magic of having greater Y-axis properties by having an 8" flange width (W12x40) versus a 6" flange width (W18x40). From AISC 7th Edition, 50 ksi steel (to simulate A992). Unbraced Length < 10 feet: W18x40 Unbraced Length > 10 feet: W12x40 http://www.SlideRuleEra.net http://www.VacuumTubeEra.net Upvote 0 Downvote
The magic of having greater Y-axis properties by having an 8" flange width (W12x40) versus a 6" flange width (W18x40). From AISC 7th Edition, 50 ksi steel (to simulate A992). Unbraced Length < 10 feet: W18x40 Unbraced Length > 10 feet: W12x40 http://www.SlideRuleEra.net http://www.VacuumTubeEra.net
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