Sihombing, Gokma Ferdinanta (2026) Analisis Numerik Model Slit Link Pada Sistem Struktur EBF Untuk Kategori Link Pendek. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Indonesia berada pada zona kegempaan tinggi sehingga bangunan baja perlu dirancang dengan sistem penahan gaya lateral yang kaku dan daktail, salah satunya sistem Eccentrically Braced Frame (EBF) dengan elemen link sebagai komponen disipasi energi utama. Berbagai penelitian menunjukkan bahwa link kategori pendek (short link) memberikan perilaku histeretik yang lebih stabil dan kapasitas disipasi energi yang lebih besar dibanding link menengah dan panjang. Di sisi lain, pengembangan slit link beam dan steel slit damper melalui modifikasi badan balok dengan bukaan (slit) blok maupun parabolik terbukti mampu mendistribusikan regangan plastis secara lebih merata dan mengendalikan lokasi kerusakan. Namun, kajian numerik yang secara khusus membahas perilaku balok slit link kategori bentang pendek berbasis profil Wide Flange (WF) sebagai elemen tunggal masih terbatas. Penelitian ini bertujuan menganalisis secara numerik perilaku balok slit link kategori bentang pendek menggunakan pemodelan elemen hingga nonlinier di perangkat lunak Abaqus, tanpa memodelkan portal EBF secara utuh. Tiga konfigurasi balok link dianalisis, yaitu link konvensional tanpa slit, block slit link, dan parabolic slit link yang diadaptasi dari konsep slit link beam dan penelitian slit link WF terdahulu. Profil WF dan panjang link direncanakan agar memenuhi kriteria short link (ρ < 1,6) berdasarkan rasio antara momen plastis dan geser plastis sesuai rekomendasi AISC dan studi perilaku link pendek–menengah–panjang. Pembebanan siklik quasi statik diberikan pada ujung balok dengan kontrol perpindahan mengacu pada protokol AISC 341 22 untuk mengevaluasi kurva histeretik gaya–perpindahan, backbone curve, distribusi tegangan dan regangan plastis, serta kapasitas disipasi energi. Hasil analisis menunjukkan bahwa balok link konvensional memiliki kapasitas geser puncak dan disipasi energi tertinggi, tetapi distribusi tegangan merambat lebih luas ke daerah sekitar tumpuan. Penerapan block slit dan parabolic slit menurunkan kapasitas geser puncak namun meningkatkan daktilitas, kestabilan histeretik, dan lokalisasi plastis di zona slit sehingga sesuai dengan konsep elemen fuse pada sistem EBF. Konfigurasi parabolic slit menghasilkan distribusi tegangan yang lebih halus dibanding block slit sehingga memberikan respons siklik yang lebih stabil. Temuan ini menguatkan rekomendasi penggunaan short link sebagai elemen disipasi energi utama dan menunjukkan potensi balok slit link WF sebagai perangkat disipasi energi yang efisien dan lebih mudah diperbaiki setelah gempa.
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Indonesia is located in a high seismicity zone; therefore, steel structures must be designed with lateral force-resisting systems that are both stiff and ductile. One such system is the Eccentrically Braced Frame (EBF), which utilizes link elements as the primary energy dissipation components. Numerous studies have shown that short links exhibit more stable hysteretic behavior and greater energy dissipation capacity compared to intermediate and long links. Meanwhile, the development of slit link beams and steel slit dampers, through modifications of beam webs using block or parabolic slit openings, has been proven to distribute plastic strain more evenly and control damage localization. However, numerical studies specifically addressing the behavior of short-span slit link beams based on Wide Flange (WF) sections as standalone elements remain limited.
This study aims to numerically analyze the behavior of short-span slit link beams using nonlinear finite element modeling in Abaqus, without modeling the entire EBF frame system. Three link beam configurations are analyzed: a conventional link without slits, a block slit link, and a parabolic slit link adapted from slit link beam concepts and previous WF slit link studies. The WF sections and link lengths are designed to satisfy the short link criteria (ρ<1.6), based on the ratio of plastic moment to plastic shear in accordance with AISC recommendations and established short–intermediate–long link behavior classifications. Quasi-static cyclic loading is applied at the beam end using displacement control, following the AISC 341-22 protocol, to evaluate force–displacement hysteretic curves, backbone curves, stress and plastic strain distributions, and energy dissipation capacity.
The analysis results indicate that the conventional link beam exhibits the highest peak shear capacity and energy dissipation, but with stress distribution spreading more extensively into regions near the supports. The implementation of block slit and parabolic slit configurations reduces peak shear capacity but improves ductility, hysteretic stability, and plastic localization within the slit zones, aligning with the fuse element concept in EBF systems. The parabolic slit configuration provides smoother stress distribution compared to the block slit, resulting in more stable cyclic response. These findings reinforce the recommendation of using short links as primary energy dissipation elements and demonstrate the potential of WF slit link beams as efficient and more easily repairable energy dissipation devices after earthquakes.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Eccentrically Braced Frame (EBF), slit link, link pendek, disipasi energi, pembebanan siklik, struktur baja tahan gempa, comb-teeth damper. |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) > TA656.2 Buckling T Technology > TA Engineering (General). Civil engineering (General) > TA660.F7 Structural frames. |
| Divisions: | Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Civil Engineering > 22101-(S2) Master Thesis |
| Depositing User: | Gokma Ferdinanta Sihombing |
| Date Deposited: | 16 Jul 2026 07:26 |
| Last Modified: | 16 Jul 2026 07:26 |
| URI: | http://repository.its.ac.id/id/eprint/135175 |
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