Prakoso, Yosia (2014) Kajian Kekuatan Kolom-Ponton Semi-Submersible Dengan Konfigurasi Delapan Kolom Berpenampang Persegi Empat Akibat Eksitasi Gelombang. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Semisubmersible merupakan salah satu struktur yang handal digunakan dalam berbagai kondisi lautan. Sebelum dioperasikan, semisubmersible perlu dilakukan analisis karakteristik respon gerak dan kekuatan memanjang struktur pada kondisi lautan tempat semisubmersible beroperasi untuk mengetahui kemampuan struktur terhadap beban gelombang. Kajian dalam penelitian ini menggunakan rancangan semisubmersible dengan konfigurasi delapan kolom berpenampang persegi dan menggunakan acuan dari Semisubmersible Essar Wildcat berdisplasemen 24173 ton yang beroperasi di Laut Natuna. Perhitungan respon struktur diselesaikan dengan integrasi dari distribusi beban dan distribusi gaya apung (buoyancy) pada semisubmersible dengan kondisi still water dan kondisi gelombang (hogging dan sagging). Perhitungan respon struktur semisubmersible menghasilkan kekuatan memanjang pada struktur yaitu shear force dan bending moment. Respon struktur terbesar dihasilkan pada kondisi sagging panjang gelombang sama dengan panjang struktur, dengan shear force sebesar 19.18 MN dan bending moment sebesar -259.58 MN.m. Pemodelan kekuatan struktur dilakukan dengan variasi model global dan sambungan kolom-ponton (lokal) untuk mengetahui secara spesifik tegangan yang terjadi pada sambungan kolom-ponton. Pada analisis kekuatan didapatkan model global semisubmersible yang paling efektif dengan tegangan maksimum sebesar 71 MPa dan deformasi total maksimum sebesar 7.3 mm.
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Semisubmersible is one of the reliable structure that used in a variety of sea conditions. Before the operation, the semisubmersible need to analyze the response characteristics of motion and strength of the structure to the sea state where the semisubmersible operate to determine the ability of the structure due to the wave loads. Studies in this research using the semisubmersible design with eight columns rectangular section and design reference from the semisubmersible Essar Wildcat with 24.173 tonnes of displacement which will operating in the Natuna Sea. Calculation of the response of the structure completed with the integration of load distribution and the distribution of buoyancy load on semisubmersible within conditions still water and wave conditions (hogging and sagging). Calculation of structural response of semisubmersible produces longitudinal response of a structure those are shear force and bending moment. Largest structural response is generated in sagging condition of wave length equal to the length of the structure, the shear force at 19:18 MN and bending moment at -259.58 MN.m. Modeling conducted by variation of semisubmersible model to know the strength of structure by the global model and local model (column-pontoon connection) to find out the specifics stress that occurs in connection of column-pontoon. In the analysis of the strength of the global model obtained semisubmersible most effective with a maximum stress of 71 MPa and a maximum total deformation of 7.3 mm.
| Item Type: | Thesis (Other) |
|---|---|
| Additional Information: | RSKe 623.812 8 Pra k-2014 |
| Uncontrolled Keywords: | semisubmersible, kekuatan memanjang, shear force, bending moment, tegangan Von Mises, deformasi total, semisubmersible, longitudinal strength, shear force, bending moment, Von Mises stress, total deformation |
| Subjects: | T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures |
| Divisions: | Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis |
| Depositing User: | Mr. Marsudiyana - |
| Date Deposited: | 06 Jul 2023 08:08 |
| Last Modified: | 06 Jul 2023 08:08 |
| URI: | http://repository.its.ac.id/id/eprint/98367 |
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