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538_Mechanics SolutionInstructors_Sol.Manual-Mechanics_Materials_7e.book_Gere_light.1

# 538_Mechanics SolutionInstructors_Sol.Manual-Mechanics_Materials_7e.book_Gere_light.1

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532 CHAPTER 6 Stresses in Beams (Advanced Topics) Problem 6.5-5 A beam made up of two unequal leg angles is subjected to a bending moment M having its vector at an angle u to the z axis (see figure part a). (a) For the position shown in the figure, determine the orientation of the neutral axis and calculate the maximum tensile stress s t and maximum compressive stress s c in the beam. Assume that u ± 30° and M ± 30 k-in. (b) The two angles are now inverted and attached back-to-back to form a lintel beam which supports two courses of brick façade (see figure part b). Find the new orientation of the neutral axis and calculate the maximum tensile stress s t and maximum compressive stress s c in the beam using u ± 30° and M ± 30 k-in. (a) y M z C in. 3 4 u L 5 ² 3 ² 1 2 1 2 (b) y M z C Lintel beam supporting
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