Beer & Johnston — Stress and Strain—Axial Loading: Problem 2.36

2.36 For the post in Prob. 2.35, determine the maximum centric force that can be applied if the allowable normal stress is 15 ksi in the steel and 1.6 ksi in the concrete. (Reference Data from Prob. 2.35: The 5-ft concrete post is reinforced with six steel bars, each with a 7/8-in. diameter. $E_s = 29 \times 10^6$ psi, $E_c = 3.6 \times 10^6$ psi. The post has a square cross-section of 10 in. x 10 in.)