<![CDATA[This study analyzes the seismic performance of regular and irregular reinforced-concrete building structures according to the SNI 1726:2019 standard. Four twelve-story models were developed using a special moment-resisting frame system: three irregular structures with a re-entrant-corner configuration and one regular structure, using seismic parameters from the earthquake-prone Tarutung region, North Sumatra. Response-spectrum analysis was performed in ETABS, focusing on base shear, story shear, displacement, torsion, and column reinforcement. Results show that the regular model exhibits a coincident center of mass and center of rigidity, whereas the three irregular models show an eccentricity of 0.01-0.32 m, generating additional torsional moment of up to 3.52 kNm at the base column, compared with almost zero in the regular model. The irregular models with the sharpest re-entrant corner (Model 1) required the largest longitudinal column reinforcement (16D22) with the tightest transverse spacing, while the regular model (Model 4) required comparatively less reinforcement (12D22). All models satisfied the strong-column weak-beam requirement of SNI 2847:2019. These findings confirm that horizontal irregularity increases torsional demand and local reinforcement needs, underscoring the importance of strict compliance with seismic design codes when irregular building configurations are unavoidable.]]>
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