6-7. Several building columns are to be designed, using A992 steel and the AISC Specification. Select the lightest avail

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6 7 Several Building Columns Are To Be Designed Using A992 Steel And The Aisc Specification Select The Lightest Avail 1 (94.7 KiB) Viewed 33 times

6-7. Several building columns are to be designed, using A992 steel and the AISC Specification. Select the lightest available W sections and state the LRFD design strength, "cPn, and the ASD allowable strength, P, 70, for these columns that are described as follows: 6.11 Problems for Solution 197 = = a. PD 170 k, PL 80 k, L = 16 ft, pinned end supports, W8. (Ans. W8 X 48, LRFD •Pn= 340 k > P = 332 k; W8 X 58, ASD P,/2. = 278 k> P,= 250 k) b. Po= 100 k, PL = 220 k, L = 25 ft, fixed at bottom, pinned at top, W14. (Ans. W14 x 74, LRFD Pn=495 k> Pu= 472 k; W14 x 74, ASD P.,/12= 329 k> P, = 320 k) c. Po = 120 k, P = 100 k, L = 25 ft, fixed end supports, W12. (Ans. W12 X 50, LRFD OP,= 319 k> P = 304 k; W12 X 53, ASD P./12. = 297 k> P = 220 k) d. PD=250 k, PL = 125 k, L = 18.5 ft, pinned end supports, W14. (Ans. W14 x 74, LRFD OPn= 546 k>P,= 500 k; W14 x 82, ASD P/A2 = 400 k> Pa = 375 k)