(a) l4 points cutting through a beam. an intemal bending moment M and an interna

Question

(a) l4 points cutting through a beam. an intemal bending moment M and an internal torsional moment T are found acting on section b-b. Do both moments cause normal stresses at point A? yes or no Cross-section at b-b Elevation (b) l4 pointsl While designing a beam for bending about its strong axis you find that a section modulus of 30 in is required. Select the lightest W12 shape section from Appendix B (table is attached to equation sheet) that is OK in bending e., meets the bending requirement). (co 18 points l sketch the buckled shapes for the two columns below. brace

Explanation / Answer

a. Ans - No. (Explaination - the bending moment M will cause Normal Stress at Point A but the Torsional Moment T will only cause shear stresses. Hence ans is No.)

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