Unformatted text preview: conflict with moment? Why? Yes, there is a conflict. The closest S in the S x table is 108 in 3 for a W18x60 with a listed moment of 214,000 ft-lb. BUT, the calculated resisting moment is 215,600 ft-lb in the actual member. Why is this? Because AISC uses M R (resisting moment) as 0.66 F y = 23,760 lb/in 2 which they round to 23,800 rather than 24,000 lb/in 2 as we do. But, if you check the S x using the 23,800 lb/in 2 you get a required S of 108.7 in 3 which STILL leaves the AISC table in conflict. There are very few silver bullets where everything in life is perfectly solved....
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- Winter '08
- Bullet, section modulus, sx table, calculated resisting moment