Evaluasi Kinerja Sistem Struktur Rangka Pemikul Momen Khusus Pada Gedung Baja dengan Variasi Pemodelan Sendi Plastis
DOI:
https://doi.org/10.5614/jts.2025.32.2.8Keywords:
Deformation-controlled, force-controlled, SMRF, performance evaluation, pushover analysisAbstract
Abstrak
Seringnya terjadi gempa bumi di Indonesia menuntut perencana struktur untuk menyediakan sistem pemikul beban lateral pada bangunan, tidak terlepas pada struktur bangunan baja. Di antara sistem-sistem struktur yang tersedia, Sistem Rangka Pemikul Momen Khusus (SRPMK) banyak diterapkan dikarenakan daktilitasnya yang tinggi dan disukai arsitek karena desainnya yang multifungsi. Penelitian ini mengevaluasi kinerja seismik dari SRPMK pada gedung baja 5 lantai dengan fungsi apartemen, dirancang sesuai SNI 1726:2019, SNI 1729:2020, SNI 7860:2020 dan SNI 7972:2020. Kinerja struktur diperiksa terhadap dua level bahaya gempa?Desain Basis Earthquake (DBE) dan Maximum Considered Earthquake (MCE)?seperti yang dispesifikasikan oleh ASCE 41-17, menggunakan analisis pushover dengan dua pendekatan pemodelan sendi plastis. Model 1 menggunakan sendi plastis dengan tipe deformation-controlled untuk perilaku lentur balok dan perilaku aksial-lentur kolom. Untuk Model 2, sendi plastis pada kolom dirubah menjadi tipe force-controlled didasarkan telah terpenuhinya kriteria perancangan strong-column-weak-beam saat mendesain ukuran penampang. Dua metode evaluasi kinerja struktur yaitu Capacity Spectrum Method (CSM) dan Displacement Coefficient Method (DCM) digunakan untuk memeriksa kinerja struktur. Melalui dua metode tersebut, hasil penelitian menunjukkan pemodelan sendi plastis pada Model 1 menghasilkan evaluasi kinerja struktur yang lebih baik dibandingkan Model 2.
Kata-kata Kunci: Analisis pushover, deformation-controlled, evaluasi kinerja, force-controlled, SRPMK.
Abstract
Indonesia's frequent seismic activity necessitates that structural engineers incorporate effective lateral load-resisting systems in building designs, particularly for steel structures. Among the available systems, the Special Moment Resisting Frame (SMRF) is widely adopted due to its ductility and is favored by architects for its design versatility. This study evaluates the seismic performance of an SMRF system in a five-story steel apartment building, designed in accordance with SNI 1726:2019, SNI 1729:2020, SNI 7860:2020, and SNI 7972:2020. The structural performance is assessed against two seismic hazard levels?Desain Basis Earthquake (DBE) and Maximum Considered Earthquake (MCE)?as specified in ASCE 41-17, using pushover analysis with two different plastic hinge modeling approaches. Model 1 employs deformation-controlled plastic hinges for both beam flexural behavior and column axial-flexural behavior, while Model 2 modifies the column hinges to be force-controlled, based on the fulfillment of the strong-column-weak-beam design criterion. Two methods of performance evaluation, the Capacity Spectrum Method (CSM) and the Displacement Coefficient Method (DCM), are used to assess the structural performance. Through these two methods, the results show that the plastic hinge modeling in Model 1 yields better structural performance evaluation compared to Model 2.
Keywords: Deformation-controlled, force-controlled, SMRF, performance evaluation, pushover analysis.
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