Evaluasi Kinerja Seismik Struktur Beton Bertulang Gedung Rumah Sakit Umum Fandika Takengon
Abstract
Hospitals are critical facilities required to remain structurally safe and fully operational following an earthquake. This study aims to evaluate the seismic performance and structural compliance of the Fandika Takengon General Hospital Building following a configuration change from the initial plan of six stories to four stories. The evaluation was conducted through three-dimensional modeling using CSI ETABS software based on SNI 1726:2019 on a dual system consisting of a Special Moment Resisting Frame System (SMRFS) and shear walls. The evaluated parameters include base shear force, modal mass participation, inter-story drift, dual system contributions, and structural irregularities. The analysis results indicate that the structure complies with the global seismic response requirements based on SNI 1726:2019, with a base shear force of 13,522.52 kN in the X-direction and 13,568.53 kN in the Y-direction, and all inter-story drift values fall below the allowable limits. The moment-resisting frame is capable of resisting more than 25% of the seismic force, thereby satisfying the dual system requirements. Nonetheless, torsional irregularities were still identified on several floors, along with a mass irregularity on the second floor, and a re-entrant corner irregularity in the Y-direction, which potentially affect the local structural response during a strong earthquake. This study demonstrates that a comprehensive seismic performance evaluation is critical for existing buildings undergoing configuration changes, as compliance with global response requirements does not fully guarantee the absence of potential local vulnerabilities. The findings of this study are expected to serve as a reference for the evaluation and verification of structural safety in hospital buildings and other essential structures prior to operation.
Keywords:
Dual system; reinforced concrete; response-spectrum analysis; seismic performance; structural irregularity
Abstrak
Rumah sakit merupakan bangunan dengan fungsi penting yang dituntut tetap aman secara struktural dan mampu mempertahankan operasionalnya setelah terjadi gempa bumi. Penelitian ini bertujuan mengevaluasi kinerja seismik dan kesesuaian struktur Gedung Rumah Sakit Umum Fandika Takengon setelah perubahan konfigurasi dari rencana awal enam lantai menjadi empat lantai. Evaluasi dilakukan melalui pemodelan tiga dimensi menggunakan perangkat lunak CSI ETABS berdasarkan SNI 1726:2019 pada sistem ganda yang terdiri atas Sistem Rangka Pemikul Momen Khusus (SRPMK) dan dinding geser. Parameter yang dievaluasi meliputi gaya geser dasar, partisipasi massa modal, simpangan antar tingkat, kontribusi sistem ganda, serta ketidakberaturan struktur. Hasil analisis menunjukkan bahwa struktur memenuhi persyaratan respons seismik global berdasarkan SNI 1726:2019, dengan gaya geser dasar sebesar 13.522,52 kN pada arah X dan 13.568,53 kN pada arah Y, serta seluruh nilai simpangan antar tingkat berada di bawah batas yang diizinkan. Rangka pemikul momen mampu menahan lebih dari 25% gaya gempa sehingga persyaratan sistem ganda terpenuhi. Namun demikian, masih teridentifikasi ketidakberaturan torsi pada beberapa lantai, ketidakberaturan massa pada lantai dua, dan ketidakberaturan sudut dalam pada arah Y yang berpotensi memengaruhi respons lokal struktur saat terjadi gempa kuat. Penelitian ini menunjukkan bahwa evaluasi kinerja seismik secara komprehensif sangat penting dilakukan pada bangunan eksisting yang mengalami perubahan konfigurasi, karena terpenuhinya persyaratan respons global belum sepenuhnya menjamin tidak adanya potensi kerentanan lokal. Hasil penelitian ini diharapkan dapat menjadi acuan dalam evaluasi dan verifikasi keamanan struktur bangunan rumah sakit maupun bangunan penting lainnya sebelum dioperasikan.
Kata kunci:
Analisis respons spektrum; beton bertulang; ketidakberaturan struktur; kinerja seismik; sistem ganda
Keywords
References
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DOI: https://doi.org/10.38038/vocatech.v8i2.267
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Vocatech : Vocational and Technology Journal
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