3.- A two-story building has steel columns AB in the first floor and BC in the s

Question

3.- A two-story building has steel columns AB in the first floor and BC in the second floor, as shown in the figure. The roof load P1 equals 400 kN and the second floor load P2 equals 720 kN. Each column has length L =3.75 m. The cross-sectional areas of the first and second floor columns are 11,000 mm2 and 3,900 mm2, respectively. a.- Draw an axial load diagram for the whole column AC. 5 points. b.- Find the minimum yield strength the material of the column must have if if needs to withstand the stress with a safety factor of 3. 10 points. c.- Go to the appendix in your textbook and choose the cheapest structural steel that will meet the required yield strength. Hint: the lower the yield strength, the cheaper the material will be. 5 points. TO SEE PICTURE OF STEEL COLUMS GO TO WEBSITE AND GO TO # 2.3-6 http://www.aaronklapheck.com/Downloads/Engr112_Handouts/ENGR112 Solutions/engr112_solutions_all.pdf

Explanation / Answer

Find stress in rod by , stress= force/cross sect area. now minimum yeild strength req is stress* safety factor.

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