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Question: 4 using the diagrams of beam crosssection shown below and...

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4 Using the diagrams of beam cross-section shown below and an allowable bending stress of 1.2 kpsi for wood and 12 kpsi for steel, find the maximum uniform distributed load that can safely be supported between simple supports for A) cross-section (a) consisting of a wood joist, 1.5 by 9.5 inches and 12 feet long B) cross-section (b) consisting of a hollow steel tube, outside dimensions 3 by 2 inches, formed from 3/16 inch thick material and 4 feet in length (neglect effects of rounded corners) C) cross-section (c) consisting of steel angles 3 by 3 inches and 1/3 inch thick, 6 feet in length
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