Analisis Perilaku Sambungan Balok Haunched Bolted Extended End-Plate pada Sumbu Lemah Kolom Baja

Diputra, Aditya Tamateja (2024) Analisis Perilaku Sambungan Balok Haunched Bolted Extended End-Plate pada Sumbu Lemah Kolom Baja. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Sambungan end-plate dengan penambahan haunch sangat umum digunakan pada struktur baja di Indonesia, baik digunakan pada sumbu kuat kolom maupun pada sumbu lemah kolom. Namun, SNI 7972:2020 tidak mengatur sambungan jenis ini. Mengingat Indonesia merupakan kawasan dengan resiko gempa tinggi, sistem struktur yang digunakan pada sistem rangka pemikul momen adalah sistem rangka pemikul momen khusus (SRPMK). Kriteria yang harus dicapai sambungan SRPMK menurut SNI 7860:2020 adalah mampu mencapai 0,80 Mp balok saat sudut rotasi 4%. Masih terbatasnya penelitian tentang sambungan end-plate dengan penambahan haunch pada sumbu lemah kolom menyebabkan perilaku sambungan belum diketahui dengan baik.
Metodologi yang digunakan pada penelitian ini adalah analisis numerik dengan perangkat lunak ANSYS. Analisis balik dilakukan pada WEAK-DB600-SW dari eksperimen Lee et al., 2019. Benda uji WEAK-DB600-SW dimodelkan kembali pada software ANSYS dan dibebani beban siklik sesuai dengan ketentuan siklus pembebanan AISC dan dianalisis hingga hasil berupa kurva histerisis dan mode kegagalan mirip dengan hasil eksperimen. Hal ini dilakukan sebagai tolak ukur keakuratan permodelan. Setelah hasil permodelan WEAK-DB600-SW mirip dengan eksperimen asli, dilakukan permodelan 2 model yang diajukan yaitu H1 dan H2. Kedua model ini merepresentasikan sambungan haunched bolted extended end-plate pada sumbu lemah kolom yang sering digunakan di Indonesia. Model H1 dan H2 dibebani secara siklik sesuai dengan SNI 7860:2020.
Dari hasil analisis diketahui bahwa kedua model dapat mengakomodir 0,80 Mp balok saat rotasi 4%. Saat rotasi 4%, Model H1 mencapai momen sebesar 1795,32 kN-m dan Model H2 sebesar 1966,06 kN-m. Keduanya sudah lebih besar daripada 0,80 Mp yaitu 1044,79 kN-m. Namun, kedua model memulai mode kegagalan yang tidak sesuai dengan prinsip sambungan SRPMK. Model H1 mengawali sendi plastis pada bagian badan kolom akibat efek prying sebelum akhirnya terjadi sendi plastis pada sayap balok. Model H2 mengawali sendi plastis dari deformasi profil-T akibat efek prying, meskipun pada akhir siklus terjadi sendi plastis di sayap balok. Daktilitas sambungan model H1 sebesar 2,26 sedangkan model H2 sebesar 2,06. Dari hasil tersebut, sambungan haunched bolted exctended end-plate yang dipasang pada sumbu lemah kolom baja tidak layak digunakan sebagai sambungan sistem rangka pemikul momen khusus.
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End-plate with additional haunch connection is a very common beam to column connection in Indonesia, either connected on strong axis column or on weak axis column. Yet, SNI 7972:2020 about prequalified connection system for special moment frame or intermediate moment frame has not arrange this type of connection. Considering Indonesia is a country with high risk of earthquake case, structural system that has to be used on moment frame is special moment frame. Criterias to be attained according to SNI 7860:2020 about seismic provisions for structural steel buildings are connection shall be capable of accommodating a story drift angle of at least 0,04 rad dan the flexural resistance of the connection shall reach at least 0,80 Mp at a story drift angle of 0,04 rad with Mp is plastic bending moment of the beam. The connection has to remain elastic when the beam reach failure phase. The study of end-plate connection with additional haunch is still limited, especially when it comes to weak axis connection. Thus, the behavior of this connection is not to be discovered yet.
The methodology used in this study is numerical analysis with back to back analysis to WEAK-DB600-SW specimen from Lee et al., 2019 experiment. The WEAK-DB600-SW is remodeled on ANSYS dan loaded with cyclic loading according to AISC loading protocol. Then the WEAK-DB600-SW model is analyzed until the hysteretic curve dan failure mode are similar to the original experiment. The purpose of back-to-back analyisis is for benchmarking the accuracy of the model later. After the WEAK-DB600-SW model histerytic curve dan failure mode are similiar to the original experiment, the haunched bolted extended end-plate connection consists of H1 dan H2 are modeled on ANSYS. These proposed models are representing the haunched connection which commonly used in Indonesia. These three models are loaded with loading cycle according to SNI 7860:2020 provision.

Analysis show that both H1 dan H2 are capable to accommodate 0,80 Mp at a story drift angle of 0,04 rad. H1 moment at 4% rotation is 1795,32 kN-m and H2 moment is 1966,06 kN-m whereas 0,80 Mp is only 1044,79 kN-m. However, failure mode on both models does not represent the SMF failure mode. H1 model started plastic hinge at the column’s web because of prying effect while H2 model started the plastic hinge by the prying effect at T profile although both models shown a plastic hinge at the top flange after the last cycle. The ductility of H1 model is 2,26 whereas H2 model is 2,06. These results indicate that haunched bolted exctended end-plate isn’t suitable for steel special moment frame weak axis connection.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Haunched bolted extended end-plate, sumbu lemah kolom, kolom baja, sambungan balok kolom,Haunched bolted extended end plate, weak axis column, steel column, beam to column connection.
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA347 Finite Element Method T Technology > TA Engineering (General). Civil engineering (General) > TA492.W4 Welded joints T Technology > TA Engineering (General). Civil engineering (General) > TA645 Structural analysis (Engineering) T Technology > TA Engineering (General). Civil engineering (General) > TA656.2 Buckling
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Civil Engineering > 22101-(S2) Master Thesis
Depositing User:	Aditya Tamateja Diputra
Date Deposited:	30 Jul 2024 14:06
Last Modified:	30 Jul 2024 14:06
URI:	http://repository.its.ac.id/id/eprint/110068

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