693_Mechanics SolutionInstructors_Sol.Manual-Mechanics_Materials_7e.book_Gere_light.1

# 693_Mechanics SolutionInstructors_Sol.Manual-Mechanics_Materials_7e.book_Gere_light.1

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SECTION 8.5 Combined Loadings 687 Problem 8.5-11 An L-shaped bracket lying in a horizontal plane supports a load P 150 lb (see figure). The bracket has a hollow rectangular cross section with thickness t 0.125 in. and outer dimensions b 2.0 in. and h 3.5 in. The centerline lengths of the arms are b 1 20 in. and b 2 30 in. Considering only the load P , calculate the maximum tensile stress s t , maximum compressive stress s c , and maximum shear stress t max at point A , which is located on the top of the bracket at the support. P = 150 lb A b 1 = 20 in. b 2 = 30 in. h = 3.5 in. b = 2.0 in. t = 0.125 in. Solution 8.5-11 L-shaped bracket P 150 lb b 1 20 in. b 2 30 in. t 0.125 in. h 3.5 in. b 2.0 in. F REE - BODY DIAGRAM OF BRACKET S TRESSES AT POINT A ON THE TOP OF THE BRACKET (The shear force V produces no stresses at point

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