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ARC322 HW 10 KEY 2008

# ARC322 HW 10 KEY 2008 - in-lb Select a WF 1 point Convert...

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ARC322 HW#10 Module 14 2008 KEY No Sketches are Required 1. A beam has a required S of 87.5 in 3 . Select a WF. 1 point From S x Table W18x50 … S x = 18.9 in 3 > 87.5 in 3 … OK … close consider beam weight 2. A beam has a required S of 167 in 3 . Select a WF. 1 point From S x Table W24x76 … S x = 176 in 3 > 167 in 3 … OK 3. A beam has a required S of 135 in 3 . Select a WF. What is its maximum unbraced length (Lc)? 1 point From S x Table W21x68 … S x = 140 in 3 > 135 in 3 … OK L c = 8.7 ft … OR From S x Table W24x68 … S x = 154 in 3 > 135 in 3 … OK L c = 9.5 ft 4. A beam has a maximum moment of 286,000 ft-lb. Select a WF. 1 point From S x Table W24x68 (preferred) OR From Moment Table W18x76 5. A beam has a maximum moment of 476,098 ft-lb. Select a WF. 1 point From S x Table W40x149 OR From Moment Table W27x94 (preferred) 6. A beam has a maximum moment of 98,000 ft-lb. Select a WF. 1 point From S x Table W18x55 OR From Moment Table W10x45 (preferred) 7. A beam has a maximum moment of 2,280,000

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Unformatted text preview: in-lb . Select a WF. 1 point Convert in-lb to ft-lb … 2,280,000 in-lb / 12 in/ft = 190,000 ft-lb From S x Table W18x55 OR From Moment Table W18x55 8. What is the maximum moment allowed for a W36x170? What is its maximum unbraced length? 1 point From S x Table 1,150,000 ft-lb … L c = 12.7 ft OR From Moment Table 1,160,000 ft-lb … L c = 12.75 ft 9. What is the maximum moment allowed for a WF with a section modulus of 98.6 in3? What is the WF? Calculate the value of the maximum moment before selecting the WF? 1 point S = M/ f rearranging, M = S f = 98.6 in 3 x 24,000 lb/in 2 = 2,366,400 in-lb/12 in/ft = 197,200 ft-lb From S x Table W24x55 … Maximum Moment is 226,000 ft-lb OR From Moment Table W18x55 … Maximum Moment is 196,550 ft-lb 10. What is the maximum unbraced length allowed for a W14x90? 1 point From S x Table L c = 15.3 ft OR From Moment Table L c = 15.25 ft...
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