The column is constructed from high-strength concrete and eight A992 steel reinforcing rods - 4-31

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4–31. The column is constructed from high-strength concrete and eight A992 steel reinforcing rods. If the column is subjected to an axial force of 200 kip, determine the average normal stress in the concrete and in each rod. Each rod has a diameter of 1 in.

All problems from Mechanics of Materials Eleventh Edition by Russell C. Hibbeler.
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Thank you for this video! I know it's a little old but could you explain why the area of the concrete, A_c, is not 8(pi/4)? There are 8 rods so I would assume the cross-sectional area of the rods would be 8 times the area of a single rod. Thanks!

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