Electronic Theses and Dissertation

Sambungan pelat ujung (flush end plate) merupakan sambungan baja semi-kaku yang mudah difabrikasi tetapi rawan mengalami deformasi lokal dan tekuk pelat badan akibat konsentrasi tegangan. Penelitian ini menganalisis pengaruh penambahan pengaku vertikal terhadap kuat lentur, kuat geser, distribusi tegangan, dan ragam kegagalan sambungan pelat ujung menggunakan metode elemen hingga (Abaqus). Tiga model ditinjau: S1 (tanpa pengaku), S2 (pengaku jarak 200 mm), dan S3 (pengaku jarak 100 mm). Model numerik tervalidasi dengan deviasi momen ultimit 8% dan rasio kuat lentur leleh terhadap teoretis (1,41), mendekati rasio eksperimen/teoretis (1,44). Hasil menunjukkan momen ultimit S1, S2, dan S3 berturut-turut 63,60 kN.m, 66,95 kN.m, dan 68,93 kN.m (peningkatan +8,39% pada S3). Kuat geser meningkat dari 163,07 kN (S1) menjadi 176,76 kN (S3) (+8,39%). Deformasi lateral pelat badan tereduksi 87,5% (S2) dan 82,6% (S3), dengan pergeseran konsentrasi tegangan dari pelat badan ke daerah sambungan. Kekakuan sekan ultimit menunjukkan peningkatan kapasitas deformasi pasca-leleh pada model berpengaku. Dengan demikian, pengaku vertikal efektif meningkatkan kapasitas lentur dan geser serta mengendalikan tekuk lokal pelat badan.

Kata Kunci: Sambungan Pelat Ujung, Flush End Plate, Pengaku Vertikal, Kuat Lentur, Kuat Geser, Tekuk Pelat Badan, Metode Elemen Hingga

Flush end plate connections are semi-rigid steel joints that are easy to fabricate but prone to local deformation and web buckling due to stress concentration. This study investigates the effect of vertical stiffeners on flexural strength, shear capacity, stress distribution, and failure modes using the finite element method (Abaqus). Three models were analyzed: S1 (without stiffener), S2 (stiffener spacing 200 mm), and S3 (stiffener spacing 100 mm). The numerical model was validated with an ultimate moment deviation of 8% and a yield strength ratio (FEA/theoretical) of 1.41, closely matching the experimental/theoretical ratio (1.44). Results show ultimate moments of 63.60 kN.m, 66.95 kN.m, and 68.93 kN.m for S1, S2, and S3, respectively (+8.39% increase in S3). Shear capacity increased from 163.07 kN (S1) to 176.76 kN (S3) (+8.40%). Lateral web deformation was reduced by 87.5% (S2) and 82.6% (S3), accompanied by a shift of stress concentration from the web to the joint region. Secant stiffness at ultimate indicates improved post-yield deformation capacity in stiffened models. Therefore, vertical stiffeners effectively enhance flexural and shear capacity while controlling local web buckling. Keywords: End Plate Connection, Flush End Plate, Vertical Stiffener, Flexural Strength, Shear Capacity, Web Buckling, Finite Element Method