Kinerja Seismik dan Distribusi Sendi Plastis Pada Bangunan 20 Lantai dengan Dinding Geser Terputus Terhadap Beban Gempa Menggunakan Analisis Riwayat Waktu Nonlinear
DOI:
https://doi.org/10.29103/tj.v16i2.1438Keywords:
Discontinuous shear walls, Static pushover analysis, Nonlinear Time History Analysis (NLTHA), Plastic hingesAbstract
Abstrak
Studi ini menganalisis dampak reduksi tinggi shear wall vertikal dengan model 100%, 80%, dan 70% pada gedung 20 lantai di wilayah Ring of Fire Indonesia. Menggunakan Static Pushover dan NLTHA (El Centro 1940 & Kobe 1995), penelitian ini mengevaluasi parameter seismik (R, Ω, Cd) serta melacak tingkat kerusakan plastic hinge (>E) akibat efek mode tinggi. Hasil menunjukkan bahwa pemotongan shear wall memperpanjang periode fundamental gedung. Fleksibilitas global yang meningkat ini berhasil mereduksi reaksi dasar maksimum (base shear) yang ditransfer ke fondasi. Dari aspek daktilitas, penurunan interaksi aksial-momen di dasar model diskontinu meminimalkan pembentukan plastic hinge tingkat runtuh (>E) pada elemen pembatas dibandingkan konfigurasi penuh. Kesimpulannya, konfigurasi shear wall diskontinu memberikan kinerja seismik yang optimal dan sangat ekonomis. Namun, lantai terminasi wajib direkayasa dengan detail tulangan kaku guna mencegah risiko mekanisme soft-story.
Kata kunci: Dinding geser diskontinu, Analisis pushover statik, Nonlinear Time History Analysis (NLTHA), Sendi plastis
Abstract
This study analyzes the impact of reducing the height of vertical shear walls by 100%, 80%, and 70% on a 20-story building in Indonesia’s Ring of Fire region. Using Static Pushover and NLTHA (El Centro 1940 & Kobe 1995), this research evaluates seismic parameters (R, Ω, Cd) and tracks the plastic hinge damage level (>E) resulting from high-mode effects. The results show that shear wall reduction extends the building’s fundamental period. This increased global flexibility successfully reduces the maximum base reaction (base shear) transferred to the foundation. From a ductility perspective, the reduced axial-moment interaction at the base of the discontinuous model minimizes the formation of collapse-level plastic hinges (>E) in the boundary elements compared to the full configuration. In conclusion, the discontinuous shear wall configuration provides optimal seismic performance and is highly economical. However, the termination floor must be engineered with rigid reinforcement details to prevent the risk of a soft-story mechanism.
Keywords: Discontinuous shear walls, Static pushover analysis, Nonlinear Time History Analysis (NLTHA), Plastic hinges
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