Earthquake-resistant design of reinforced concrete structures remains a critical concern in seismic-prone regions. Reinforced concrete frame structures are widely used in urban construction; however, their lateral load resistance under seismic excitation requires careful structural design. Shear walls are commonly incorporated into frame systems to enhance stiffness, strength, and energy dissipation capacity. This study investigates the seismic performance of reinforced concrete frame structures with different shear wall configurations through analytical modeling and nonlinear dynamic analysis. Structural models with varying shear wall placements were analyzed under earthquake loading conditions using response spectrum and time-history methods. Performance parameters such as lateral displacement, inter-story drift, base shear, and energy dissipation were evaluated. The findings demonstrate that optimized shear wall placement significantly improves structural stability and reduces seismic vulnerability.