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I got the solution. For any other who want the solution so they can see this link http://www.ce.memphis.edu/6136/PDF_notes/i1__axial.pdf Someone told me to calculate the stiffness using the concept of spring in series or spring in parallel. and then use this stiffness to find the deflection. This deflection will be the same for concrete and steel. Anyone have any idea what is the procedure for this approach?

first of all you have to take area as transformed area. I mean A will be (Ac-As) + n As where n = Es/Ec and As is the total area of steel bars. now calculate strain by PL/AE where A is the above area and E is the E of concrete because you have already transformed steel area into concrete above. now this strain is assumed to be same in bars and concrete. and you can back calculate to check how much P steel and concrete is carrying. because it will be different for both. You cannot take the same P for both steel and concrete as you are doing in your post.

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