Samallo, Venesia Selvia (2024) Pemodelan Elemen Hingga Kolom Beton Yang Dikekang Secara Eksternal Menggunakan Stainless Steel dan Carbon Steel dibawah Beban Aksial Konsentris. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Penggunaan baja karbon konvensional pada Steel Tube Confined Concrete (STCC) menimbulkan masalah termasuk korosi, daya tahan yang buruk, dan biaya perawatan yang tinggi khususnya struktur yang dibangun di lingkungan laut. Salah satu penggunaan pengekangan eksternal pada Stainless Steel Tube Confined Concrete (SSTCC) memiliki ketahanan korosi yang lebih alami dibandingkan Carbon Steel Tube Confined Concrete (CSTCC). Penelitian ini bertujuan untuk melakukan analisis numerik memvalidasi hasil penelitian eksperimental mengenai hubungan beban-perpindahan, hubungan tegangan-regangan, pengaruh variasi bentuk penampang, mutu beton, dan ketebalan tabung pengekang, serta pengaruh parameter kontak permukaan dan ketidaksempurnaan awal. Pada penelitian ini akan dilakukan analisis elemen hingga non-linier pada 24 spesimen SSTCC dan 8 spesimen CSTCC menggunakan program 3D-NLFEA dengan program Salome sebagai pre-proseccor dan program Paraview sebagai post-processor.
Hasil penelitian menggunakan program 3D-NLFEA untuk memodelkan spesimen SSTCC dan CSTCC dari hasil eksperimen penelitian terdahulu diperoleh hasil analisa numerik untuk hubungan beban-perpindahan dengan perbedaan beban puncak rata-rata sebesar 5.17% sedangkan untuk hubungan tegangan-regangan dengan perbedaan tegangan puncak rata-rata sebesar 4.46%. Parameter yang diperhitungakan dalam pemodelan yaitu initial imperfection pada area shear band dan sensitifitas kontak permukaan. Initial imperfection dengan parameter tebal shear band sebesar 15 mm, sudut geser shear band 45⁰, dan imperfection pada mutu material beton dan tabung baja sebesar 10%. Sensitifitas kontak permukaan elemen pada penampang square diperoleh cohesive strength sebesar 0.7 MPa, uniaxial tensile strength sebesar 1.0 MPa, dan internal friction angle sebesar 15⁰ sedangkan pada penampang circular diperoleh cohesive strength sebesar 2.75 MPa, uniaxial tensile strength sebesar 1.0 MPa, dan internal friction angle sebesar 15⁰. Variasi bentuk penampang terhadap tegangan berdasarkan pemodelan menunjukkan bahwa penampang circular memiliki tegangan puncak yang lebih tinggi dibandingkan penampang square, mutu beton yang lebih tinggi menunjukkan tegangan puncak yang lebih tinggi dibandingkan mutu beton normal, dan ketebalan tabung terbesar 4 mm menunjukkan tegangan puncak yang lebih tinggi dibandingkan ketebalan tabung 3 mm dan 2 mm, serta variasi jenis baja pada Stainless Steel Tube Confined Concrete (SSTCC) dan Carbon Steel Tube Confined Concrete (CSTCC) menunjukkan tegangan puncak yang lebih tinggi terjadi pada SSTCC.
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The use of conventional carbon steel in Steel Tube Confined Concrete (STCC) causes problems including corrosion, poor durability, and high maintenance costs especially for structures built in marine environments. One of the uses of external confined in Stainless Steel Tube Confined Concrete (SSTCC) is that it has more natural corrosion resistance than Carbon Steel Tube Confined Concrete (CSTCC). This research aims to carry out numerical analysis to validate the results of experimental research regarding the load-displacement relationship, stress-strain relationship, the influence of variations in cross-sectional shape, concrete strength, and confining tube thickness, as well as the influence of surface contact parameters and initial imperfections. In this research, non-linear finite element analysis will be carried out on 24 SSTCC specimens and 8 CSTCC specimens using the 3D-NLFEA program with the Salome program as pre-processor and the Paraview program as post-processor.
The results of research using the 3D-NLFEA program to model SSTCC and CSTCC specimens from previous research experimental results obtained numerical analysis results for the load-displacement relationship with an average peak load difference of 5.17% while for the stress-strain relationship with an average peak stress difference of 4.46%. The parameters taken into account in the modeling are initial imperfection in the shear band area and surface contact sensitivity. Initial imperfection with parameters of shear band thickness of 15 mm, shear band shear angle of 45⁰, and imperfection in the quality of concrete and steel tube materials of 10%. The sensitivity of element surface contact at a square cross-section obtained a cohesive strength of 0.7 MPa, a uniaxial tensile strength of 1.0 MPa, and an internal friction angle of 15⁰, while a cohesive strength of 2.75 MPa was obtained for a circular cross-section, a uniaxial tensile strength of 1.0 MPa, and an internal friction angle of 15⁰. Variations in cross-sectional shape versus stress based on modeling show that circular cross-sections have a higher peak stress than square cross-sections, high strength concrete shows a higher peak stress than normal strength concrete, and the largest tube thickness of 4 mm shows a higher peak stress than tube thicknesses of 3 mm and 2 mm, as well as variations in steel types in Stainless Steel Tube Confined Concrete (SSTCC) and Carbon Steel Tube Confined Concrete (CSTCC) show that higher peak stress occurs in SSTCC.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Kata kunci: Stainless steel tube confined concrete, Carbon steel tube confined concrete, ketidaksempurnaan awal, kontak pemukaan elemen, program 3D-NLFEA ============================================================ Keyword: Stainless Steel Tube Confined Concrete, Carbon Steel Tube Confined Concrete, initial imperfection, surface contact of concrete and steel tube, 3D-NLFEA program |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) T Technology > TA Engineering (General). Civil engineering (General) > TA347 Finite Element Method T Technology > TA Engineering (General). Civil engineering (General) > TA433 Strength of materials. |
| Divisions: | Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Civil Engineering > 22101-(S2) Master Thesis |
| Depositing User: | Venesia Selvia Samallo |
| Date Deposited: | 13 Feb 2024 08:35 |
| Last Modified: | 13 Feb 2024 08:35 |
| URI: | http://repository.its.ac.id/id/eprint/107160 |
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