Unlike most structures, the construction of bearing walls structures does not necessarily require using reinforced concrete strip footings, but these structures can be constructed using plain concrete (P.C) strip footings, especially when constructed over competent soils. This paper aims at analyzing plain concrete strip footings, as foundation system of bearing walls structures, which are wieldy used in Egypt, as an alternative solution to reduce the construction cost of buildings. The effect of soil type, concrete strength and the number of floors on the dimensions and capacity of strip footings is studied in this paper. 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 installation. The material and geometrical non-linearity of the concrete strip footing taking into account the non-linear stress-strain relation of concrete and presence of cracking were also considered. In addition, Duncan-Mohr-Coulomb Modified model was used to simulate soil non-linearity. The obtained numerical results were compared with the experimental results conducted on such type of footings and also with the traditional method in designing of P.C strip footings commonly used by structural engineers. Design charts are proposed and presented for structural designers in order to calculate P.C strip footing dimensions according to soil type and number of floors for such strip footings which considerably cost less than traditional bearing walls construction system