This document discusses evaluating the response reduction factor (R) on RC buildings with singly and doubly reinforced beams. R reflects a structure's ability to dissipate energy through inelastic behavior and is used to reduce seismic design forces. The study aims to compute R component-wise for a 15-story building designed considering the modulus of elasticity of plain and reinforced concrete. Previous literature on determining R based on nonlinear response is reviewed. Finite element analysis and pushover analysis will be used to model beam behavior and observe the structure's nonlinear response. Experimental work will determine modulus of elasticity values. Computed R values will be compared based on concrete type considered in design.