Comparative Seismic Performance and Cost Evaluation of RC Structures in Seismic Zone II: Bare Frame, Shear Wall System, and Diaphragm Modeling using ETABS

In this thesis, a G+12 (13-storey) RC building located in Seismic Zone II with medium soil conditions is analyzed using ETABS. Three structural models are considered: a bare frame, a frame with shear walls, and a frame with diaphragm action. The seismic response of these models is compared based on key parameters including bending moment, shear force, axial force, torsion, story drift, story displacement, reinforcement quantity, and per floor cost. The inclusion of quantity and cost parameters enables a comprehensive assessment of both structural performance and economic efficiency. The analysis results indicate that the structure with shear walls and diaphragm action exhibits superior performance by significantly reducing story drift and displacement, while also requiring a lower quantity of reinforcement. Consequently, this model results in the minimum construction cost compared to the diaphragm-only and bare frame systems. This study confirms that the integration of shear walls enhances not only seismic safety but also material efficiency and cost-effectiveness, making it a preferred solution for earthquake-resistant RC building design.