52_Problem CHAPTER 9

52_Problem CHAPTER 9 - PROBLEM 9.50 To form a reinforced...

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PROBLEM 9.50 To form a reinforced box section, two rolled W sections and two plates are welded together. Determine the moments of inertia and the radii of gyration of the combined section with respect to the centroidal axes shown. SOLUTION W-section 2 7.08 in A = 4 18.3 in x I = 4 82.8 in y I = plate 22 W AA A =+ () ( ) 2 2 7.08 in 7.93 in. 0.3 in. 2 18.918 in = Now ( ) ( ) plate xx x W II I 2 42 6.495 in. 218 .3 in 7 .08in 2 
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