The concrete composite post in Figure 1.47 is 1.2 m long with a 0.3 m × 0.3 m square cross section. The post is reinforced by four vertical steel rods of the same length having a cross-sectional area of A_s = 0.00125 m2 each, and is loaded by a single vertical load P = 500 kN applied on the rigid cover plate as shown below. The modulus of elasticity for concrete is E_c = 17 GPa, whereas the modulus of elasticity of steel is E_s = 200 GPa. Determine the stresses in the steel rods and concrete.

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Rigid cover plate FIGURE 1.47 P = 500 kN 1.2 m Steel rods (4) A = 0.00125 m each Concrete 0.3 m x 0.3 m Postcross section 0.3 m. 0.3 m