Unlike most structures, the construction of bearing walls structures does not necessarily require using a lot of steel in reinforced concrete strip footings, but these structures can be constructed using light steel reinforcement. This paper aims at analyzing reinforced concrete strip footings with light steel reinforcement, as foundation system of bearing walls structures, which are widely used in Egypt, as an alternative solution to reduce the construction cost of buildings. In this paper, the effect of load value on the dimensions and capacity of strip footings is studied numerically and experimentally. A numerical model for the non-linear analysis of strip footing-soil interaction problem based on the finite and infinite element was implemented. A computer program was developed to model the strip footing-soil system. The material non-linearity of the reinforced concrete strip footing taking into account the non-linear stress-strain relation of concrete. In addition, The Modified Duncan-Mohr-Coulomb model was used to simulate soil nonlinearity. The obtained numerical results were compared with the experimental results and a good agreement was observed. Design charts are proposed and presented for structural designers in order to calculate R.C. strip footing dimensions according to load capacity.