Electronic Theses and Dissertation

Sambungan pelat ujung tipe extended end-plate merupakan salah satu jenis
sambungan baja yang banyak digunakan karena kemudahan fabrikasi dan
pemasangannya. Namun, sambungan ini berpotensi mengalami kegagalan prematur
akibat tekuk lokal pada badan balok (web buckling) ketika menerima momen lentur
yang besar. Penelitian ini bertujuan untuk mengevaluasi pengaruh penambahan
pengaku diagonal dan kombinasi pengaku diagonal-vertikal terhadap peningkatan
kuat lentur, kapasitas beban, kekakuan, daktilitas, distribusi tegangan, dan ragam
kegagalan sambungan pelat ujung. Analisis dilakukan secara numerik
menggunakan metode elemen hingga dengan perangkat lunak Abaqus. Tiga model
sambungan dianalisis, yaitu S1 sebagai model tanpa pengaku, S2 dengan pengaku
diagonal berjarak 100 mm, dan S3 dengan kombinasi pengaku diagonal dan
pengaku vertikal berjarak 100 mm. Pembebanan yang digunakan berupa beban
statik monotonik pada balok. Hasil analisis menunjukkan bahwa penambahan
pengaku meningkatkan kuat lentur sambungan. Kuat lentur ultimit S1 sebesar
106,78 kN·m meningkat menjadi 128,98 kN·m pada S2, atau naik 20,79%, dan
menjadi 152,20 kN·m pada S3, atau naik 42,54% terhadap S1. Beban ultimit juga
meningkat dari 217,917 kN pada S1 menjadi 263,221 kN pada S2 dan 310,610 kN
pada S3. Selain itu, kekakuan elastik meningkat dari 59.428,83 kN/m pada S1
menjadi 71.603,99 kN/m pada S2 dan 72.839,94 kN/m pada S3. Penambahan
pengaku juga mengubah pola distribusi tegangan menjadi lebih terarah dan mampu
mengurangi kecenderungan web buckling. Model S3 menunjukkan kinerja terbaik
karena menghasilkan kapasitas lentur, beban ultimit, kekakuan, daktilitas, dan
kontrol deformasi badan balok paling baik.

Extended end-plate connections are widely used in steel structures due to their ease of fabrication and installation. However, when subjected to high flexural demands, these connections are susceptible to premature failure caused by local buckling of the beam web, which may adversely affect their structural performance. This study investigates the effectiveness of diagonal stiffeners and combined diagonal–vertical stiffeners in enhancing the behavior of extended end-plate connections. A numerical analysis was performed using the finite element method (FEM) implemented in Abaqus software. Three connection models were examined: S1 as the unstiffened control model, S2 reinforced with diagonal stiffeners at a spacing of 100 mm, and S3 reinforced with combined diagonal and vertical stiffeners at a spacing of 100 mm. All models were subjected to monotonic static loading applied at the beam end. The performance of each model was evaluated in terms of flexural strength, load-carrying capacity, stiffness, ductility, stress distribution, and failure mode. The results indicate that the addition of stiffeners significantly improves the structural performance of the connections. The ultimate moment capacity increased from 106.78 kN·m in S1 to 128.98 kN·m in S2 and 152.20 kN·m in S3, corresponding to increases of 20.79% and 42.54%, respectively. Similarly, the ultimate load capacity increased from 217.917 kN in S1 to 263.221 kN in S2 and 310.610 kN in S3, while the elastic stiffness increased from 59,428.83 kN/m in S1 to 71,603.99 kN/m and 72,839.94 kN/m in S2 and S3, respectively. Furthermore, the stiffened models exhibited a more favorable stress distribution and reduced susceptibility to beam web buckling. Among the investigated configurations, S3 demonstrated the best overall performance, achieving the highest flexural strength, load capacity, stiffness, ductility, and resistance to beam web deformation.