Impact of inadequate confinement in RC columns of buildings under updated indonesian seismic code on structural performance
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Author |
Fajri Yusmar, Nevy Sandra, Eka Juliafad, Prima Zola, Nidal Zuwida, and Laras Oktavia Andreas
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e-ISSN |
1819-6608 |
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On Pages
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1756-1765
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Volume No. |
20
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Issue No. |
20
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Issue Date |
January 20, 2026
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DOI |
https://doi.org/10.59018/1025198
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Keywords |
detailing deficiency, energy dissipation, performance-based design, pushover analysis, seismic performance.
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Abstract
The vulnerability of reinforced concrete buildings in Indonesia-especially in seismic regions like Padang-has been worsened by poor detailing and outdated codes. This study evaluates the seismic performance of a four-story office building designed initially under SNI 1726:2012 and SNI 2847:2013, considering the updated seismic demands in SNI 1726:2019. Linear analysis showed that several beams no longer met strength requirements, while columns remained adequate due to higher initial safety factors. The structure was then modeled with four confinement reinforcement scenarios, varying stirrup quantity and spacing, to reflect typical field practices. Shear strength validation was conducted beforehand to ensure plastic mechanisms could form without premature shear failure. Nonlinear pushover analysis using SAP2000, supported by moment-curvature results from XTRACT, focused on (1) base shear and drift capacity, (2) plastic hinge formation, and (3) energy dissipation capacity. While all models satisfied Life Safety (LS) criteria, Model D-with the widest stirrup spacing-showed early stiffness degradation, exceeded shear capacity in some columns, and recorded the lowest energy dissipation. These results confirm the key role of proper stirrup detailing in enhancing strength, ductility, and seismic resilience.
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