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A square steel tube having the cross section shown is used as a column of 26-ft effective...

A square steel tube having the cross section shown is used as a column of 26-ft effective length to carry a centric load of 65 kips. Knowing that the tubes available for use are made with wall thicknesses ranging from  in. to  in. in increments of  in., use allowable stress design to determine the lightest tube that can be used. Use σY = 36 ksi and E = 29 × 106 psi.

Fig. P16.46

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Solutions For Problems in Chapter 16
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