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All Journal Rekayasa Sipil CRANE: Civil Engineering Research Journal
Nugroho, Wivia Octarena
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Civil Engineering, Building, Construction & Architecture

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Inelastic Behavior of Eccentrically Braced Frames with Vertical Links: A Numerical Study Shendri, Christina Natasha; Tjahjanto, Helmy Hermawan; Nugroho, Wivia Octarena; Pratiwi, Naomi
Rekayasa Sipil Vol. 19 No. 1 (2025): Rekayasa Sipil Vol. 19 No. 1
Publisher : Department of Civil Engineering, Faculty of Engineering, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.rekayasasipil.2025.019.01.8

Abstract

Eccentrically Braced Frames (EBFs) are seismic-resistant steel structures with horizontal or vertical energy-dissipating links designed to enhance ductility. To promote sustainability, future designs are moving toward easily replaceable structural systems that enable rapid post-earthquake rehabilitation. However, EBFs with horizontal links present challenges in repairing damaged links due to interference with other components, particularly beams. As an alternative, vertical links offer the potential to serve as "replaceable elements." Despite this advantage, no specific design guidelines currently address the lateral support requirements for EBFs with vertical links, unlike the horizontal ones. This study analyzes the inelastic behavior of EBFs with vertical links using numerical methods based on the finite element method. The results indicate that vertical link length classification and capacity design methods specified for horizontal links also apply to vertical links. This is evidenced by the shear force values in the three samples representing short, medium, and long links, resulting in values of 2.15Vp, 1.32Vp, and 1.13Vp, respectively, with the shortest link classified as a shear link. The degradations of the horizontal load capacities due to the application of initial deformation, simulating the first buckling mode, are less than 0.01% for all configurations. This verifies that without lateral supports, the vertical links could still effectively dissipate energy through flexural and/or shear yielding without lateral instability issues.
EVALUASI NUMERIK DAMPAK KETIDAKSEMPURNAAN PENAMPANG DALAM BATAS TOLERANSI TERHADAP PERILAKU LENTUR DAN GESER BALOK BAJA Tjahjanto, Helmy Hermawan; Hartono, Alvin Krishna; Nugroho, Wivia Octarena
CRANE: Civil Engineering Research Journal Vol 6 No 1 (2025): CRANE
Publisher : Program Studi Teknik Sipil, Fakultas Teknik dan Ilmu Komputer, Universitas Komputer Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34010/crane.v6i1.15742

Abstract

Kinerja balok baja dalam menahan momen lentur dan gaya geser sangat dipengaruhi oleh geometri penampang dan properti materialnya. Dalam perancangan struktur baja, ketidaksempurnaan geometri penampang dalam batas toleransi umumnya tidak diperhitungkan secara eksplisit, meskipun dapat berkontribusi terhadap perubahan perilaku struktur. Penelitian ini bertujuan untuk mengevaluasi dampak ketidaksempurnaan penampang dalam batas toleransi terhadap kekuatan dan kapasitas deformasi lentur serta geser pada balok baja berpenampang sayap lebar. Kajian dilakukan secara numerik menggunakan perangkat lunak elemen hingga pada model balok kantilever dengan panjang yang berbeda untuk merepresentasikan kegagalan dominasi lentur dan geser. Variasi model mencakup enam tipe ketidaksempurnaan berdasarkan standar JIS G3192:2008. Hasil analisis menunjukkan bahwa ketidaksempurnaan penampang yang menghasilkan bentuk asimetris terhadap sumbu lemah (Tipe-1 dan Tipe-2) dapat menurunkan kapasitas rotasi dan daktilitas lentur balok, sehingga tidak dapat digunakan sebagai bagian dari sambungan balok kolom Rangka Momen Khusus sesuai SNI 7860:2020. Selain itu, kedua tipe ketidaksempurnaan ini (Tipe-1 dan Tipe-2) dan ketidaksempurnaan pelat badan web yang tidak lurus (Tipe-6) menurunkan kapasitas deformasi geser balok, hingga 7% di bawah kekuatan geser nominal penampang. Temuan ini mengindikasikan bahwa meskipun berada dalam batas toleransi, ketidaksempurnaan geometri penampang dapat berpengaruh terhadap performa struktur.
Co-Authors Hartono, Alvin Krishna Helmy Hermawan Tjahjanto Shendri, Christina Natasha