Seismic Performance of FRP-Retrofitted RC Building Using Pushover Analysis

Nabil Mochammad Yusuf; Ari Wibowo; Retno Anggraini

doi:10.56741/jnest.v5i01.1452

Seismic Performance of FRP-Retrofitted RC Building Using Pushover Analysis

Authors

Nabil Mochammad Yusuf Brawijaya University
Ari Wibowo Brawijaya University https://orcid.org/0000-0001-9423-2248
Retno Anggraini Brawijaya University

DOI:

https://doi.org/10.56741/jnest.v5i01.1452

Keywords:

Fiber Reinforced Polymer, Pushover Analysis, Reinforced Concrete, Seismic Performance

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.

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Author Biographies

Nabil Mochammad Yusuf, Brawijaya University

is a Master’s student in the Department of Civil Engineering, Faculty of Engineering, Brawijaya University, Indonesia. His research focuses on the seismic performance of reinforced concrete buildings strengthened with fiber-reinforced polymer (FRP) materials using nonlinear static (pushover) analysis. This research is conducted as part of the requirements for the completion of his Master’s degree in Civil Engineering. (email: nabilyusuf1950@student.ub.ac.id).

Ari Wibowo, Brawijaya University

Ari Wibowo Ph.D is a lecturer and researcher at the Department of Civil Engineering at Brawijaya University, Indonesia. He specializes in seismic performance of structure, retrofitting of building and sustainable materials. (email: ariwibowo@ub.ac.id)

Retno Anggraini, Brawijaya University

is a Lecturer and researcher in the Department of Civil Engineering at Brawijaya University, Indonesia. He specializes in structural performance evaluation, innovation of construction material, and seismic design and evaluation of structural components. (email: retnoang@ub.ac.id).

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