The A-36 steel column is encased in high-strength concrete as shown. If an axial force of 60 kip is applied to the column, determine the required area (in in2) of the steel so that the force is shared equally between the steel and concrete. Modulus of Elasticity of concrete and steel is 4.2x103 and 29x103 both in ksi.

1- Daw the strain and stress diagrams for untracked plain concrete shown below. Developed the tension and compression expressions? Materials are given as: f'c=X1 MPa, fr=0.07X1 MPa X1=72.1 X2=620.4 X3=144.2 X3 mm 1- Consider a rectangular column subjected to axial compression. The material stress-strain relationships have been idealized as shown below. a) What axial load will cause concrete to be at its maximum working stress? b) find the axial load P which produces & = & = 0.0012 1.75 X3