Dear Sumit,

This case should be solved as beam on elastic support . use FEM software such as SAP2000. you can estimate the sub-grade reaction (Ks) from the attached table

regards

Dear sir, my sincere appreciation for your suggestion. I will definitely try out by the technique you have mentioned.

It would be really grateful of you, if you could suggest some manual workout example if any.

Regards,

Sumit

Dear Sumit,

Please find the attached example, I solved it manually and by SAP2000.

there is slight difference in bending moment due to simplified stress distribution.

I hope it will help

good luck

Dear sir Ahmed, 

Thank you very much.

Sumit

dear Ahmed Ebid please can you send me the whole design. I have fallen into some problem to design it. thank you.

try to study some existing excel program for combined footing with 2 columns, and apply what sir Ahmed taught you in determining V and M values manually.