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All Journal Rekayasa Sipil Journal of Novel Engineering Science and Technology
Yusuf, Nabil Mochammad
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Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Environmental Science Mechanical Engineering

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Global-Local Seismic Performance Discrepancy in Top-Heavy Adaptive Reuse Buildings on Soft Soil Yusuf, Nabil Mochammad; Wibowo, Ari; Anggraini, Retno
Rekayasa Sipil Vol. 20 No. 1 (2026): Rekayasa Sipil Vol. 20 No. 1
Publisher : Department of Civil Engineering, Faculty of Engineering, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.rekayasasipil.2026.020.01.15

Abstract

Adaptive reuse of existing high-rise buildings often introduces severe vertical mass irregularities, particularly when functional changes significantly increase live loads. Unlike previous studies that typically isolate the effects of vertical irregularity or soft soil, this research distinctly quantifies the compounded detriment of top-heavy adaptive reuse, specifically on soft soil sites. This study conducts a forensic seismic assessment of a 15-story reinforced concrete frame that was converted from an office to an archive storage facility, where live loads increased from 2.4 kN/m² to 7.18 kN/m² on the upper floors. Using Nonlinear Static Procedures according to ASCE 41-17 with semi-rigid diaphragm modeling, the structural response is evaluated under Site Class SE conditions. The analysis reveals a "Gravity Strangle" mechanism, where excessive gravity loads from the archive storage consume a significant portion of the primary beam capacity before seismic excitation. The results demonstrate a critical discrepancy: while the global roof drift (1.56%) suggests safe Immediate Occupancy (IO) performance, the maximum inter-story drift spiked to 3.18% at the transition floors. Component-level analysis further reveals that 35% of primary beams at this level suffer severe plastic hinge rotations. These findings confirm that for top-heavy buildings on soft soil, relying solely on global drift indicators is deceptive. The study advocates for mandatory nonlinear component-level verification in future adaptive reuse codes to prevent brittle soft-story failures.
Seismic Performance of FRP-Retrofitted RC Building Using Pushover Analysis Yusuf, Nabil Mochammad; Wibowo, Ari; Anggraini, Retno
Journal of Novel Engineering Science and Technology Vol. 5 No. 01 (2026): Journal of Novel Engineering Science and Technology
Publisher : The Indonesian Institute of Science and Technology Research

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56741/jnest.v5i01.1452

Abstract

The seismic evaluation of existing bank office buildings is critical for ensuring post-earthquake operational continuity. This study investigates a 14-story RC bank building in Kendari using the Nonlinear Static Procedure (NSP) per ASCE 41-17, targeting an Immediate Occupancy (IO) performance level. The initial analysis revealed a critical contradiction: while the structure's global performance appeared to meet the IO target, this assessment was found to be misleading. A detailed, element-based analysis identified a concealed local failure where a critical beam reached the Life Safety (LS) performance level, caused by a non-trivial Positive Moment at the support. A sequential Fiber Reinforced Polymer (FRP) retrofitting strategy was then implemented. The primary contribution of this study is the demonstration of the Failure Migration phenomenon. It was shown that a naive, 'single-point' retrofit (on LS-1) did not solve the problem but merely shifted the failure mode to the next weakest element (LS-2). This sequential retrofitting procedure proved necessary to track the migrating failure, which moved non-linearly between various floors, until all migrating vulnerabilities were eliminated. This finding proves that a sequential procedure is necessary to address Force Redistribution and achieve a true IO performance. The final minor global base shear increase (0.16%) was only a secondary benefit, confirming the objective was local vulnerability elimination, not a significant increase in global stiffness.
Co-Authors Ari Wibowo Retno Anggraini