Studi Numerik Perbandingan Peletakan Buckling-Restrained Braces Terhadap Perilaku Dinamik Gempa Pada Struktur Beton Bertulang
DOI:
https://doi.org/10.58344/locus.v5i4.5368Keywords:
BRB, beton bertulang, analisis riwayat waktu, interstory drift ratio, disipasi energiAbstract
Penelitian ini menganalisis pengaruh variasi penempatan Buckling Restrained Brace (BRB) terhadap kinerja seismik struktur beton bertulang 8 lantai menggunakan analisis riwayat waktu (time history analysis) pada perangkat lunak SeismoStruct. Tiga variasi penempatan BRB dievaluasi, yaitu Mid Bay, Perimeter, Hybrid dan satu model Baseline (tanpa bracing). Parameter yang ditinjau meliputi interstory drift ratio (IDR), kapasitas disipasi energi, dan Residual drift. Hasil analisis menunjukkan bahwa struktur tanpa bracing mengalami IDR maksimum sebesar 3,175%, melebihi ambang batas 2% menurut ASCE 7-16. Variasi Mid Bay menurunkan IDR maksimum menjadi 1,487%, sedangkan variasi Perimeter mencapai 1,692%. Variasi Hybrid menghasilkan IDR maksimum terendah sebesar 1,056% dengan distribusi simpangan antar lantai yang paling merata. Dari sisi disipasi energi, variasi Hybrid mencapai kapasitas tertinggi sebesar 12.212,40 kN·m, dibandingkan Mid Bay (7.932,07 kN·m) dan Perimeter (6.561,18 kN·m). Residual drift juga terkecil pada variasi Hybrid (<0,15% di seluruh lantai). Secara keseluruhan, strategi penempatan Hybrid terbukti paling efektif dalam meningkatkan kinerja seismik struktur, karena mampu menurunkan simpangan antar lantai, menyerap energi gempa paling besar, serta meminimalkan deformasi pasca gempa.
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