8-43. Determine the state of stress at point B on the cross section of the diffe

Question

8-43. Determine the state of stress at point B on the cross section of the differential element at the point 1,5 post at section a-a. Indicate the results on a 5 ft 400 tb 300 1b Internal Loadings Considering the equilibrium of the free-body diagram of the post's upper segment, Fig a, Fy- y 300- 2.5 in. V,--300 lb 400 lb -600 lb ft M-2000 lb f M.". 1500 lb.ft axes and the polar Section Properties: The moments of inertia about the y and moment of inertia of the post's cross section are 300 lb 1,-11- (25-24)-5.76 5625??n4 400 lb J-? (254-29-11-53125??n4 5/t Referring to Fig. b, .0833 in 3 2 Normal Stress The normal stress is contributed by bending stress only. Thus, For point B, y-2in, and z-0.Then a ) -1500(12)(2) 5.765625 0--1.987ksi - 1.99 ksi (C) n. 3r in 2.5in. (bj

Explanation / Answer

The section modulas Q b is zero because in this question the section modulas is calculated along z-z axis so in y direction the value is taken to be zero

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