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ITS » Paper and Presentation » Teknik Kelautan
Posted by tondoindra@gmail.com at 22/02/2016 10:11:03  •  837 Views


KAJIAN KEKUATAN STRUKTUR SEMI-SUBMERSIBLE DENGAN KONFIGURASI ENAM KAKI BERPENAMPANG PERSEGI EMPAT AKIBAT EKSITASI GELOMBANG

STRUCTURAL STRENGTH ANALYSIS ON SEMISUBMERSIBLE WITH SIX RECTANGULAR SECTION OF COLUMNS DUE TO WAVE EXCITATION

Author :
ADILAH, AHMAD ( 4310100012 )




ABSTRAK

Struktur semi-submersible mempunyai konfigurasi yang terdiri dari deck yang ditumpu oleh kolom-kolom tegak lalu ditumpu dibagian bawah oleh pontoon. Pada tugas akhir ini dilakukan kajian untuk mengetahui kekuatan struktur dari semisubmersible dengan konfigurasi enam kolom persegi empat dan dua pontoon dengan displasemen struktur sebesar 24173 ton. Tahapan awal yaitu analisa hidrodinamis untuk mendapatkan respon gerakan akibat eksitasi gelombang. Setelah itu dilakukan analisa respon struktur yang diakibatkan oleh eksitasi gelombang yaitu berupa shear force dan bending moment analisa dilakukan pada dua kondisi yaitu pada kondisi panjang gelombang sama dengan panjang struktur yaitu 107 meter dan panjang gelombang periode 100 tahunan. Selanjutnya beban yang terdisribusi pada struktur dengan material baja A36 dan tebal plat 30 mm yang ditransformasi menjadi distribusi tegangan. Analisa dilakukan dengan menggunakan tiga model struktur yaitu struktur tanpa deck deck beam rigid dan deck smeared. Pada masing-masing model didapatkan tegangan maksimum berurut-urut sebesar 201 MPa 155 MPa dan 121 MPa pada lokasi dan dari ketiga tegangan maksimum tersebut diketahui bahwa tidak ada yang melebihi tegangan yield untuk material baja A36 yaitu 250 Mpa. Lokasi tegangan maksimum pada struktur dengan tanpa deck berada di transverse beam dekat deck pada kolom tiga dan struktur dengan deck rigid berada di sambungan kolom dan pontoon pada kolom tiga sedangkan model dengan deck smeared lokasi tegangan maksimumnya ialah pada transverse beam di pontoon yang berada di bawah kolom satu.


ABSTRACT

The configuration on semi-submersible consist of deck with a straight column and on the bottom of the structure has pontoon for bouyancy. Structural strength analysis is important for semi-submersible strucutre because the analysis can find out the strength of the semi-submersible structure. This current study is concentrated on structural strength analysis of the semi-submersible with six columns and two pontoons for the bouyancy and the displacement of the structure is 24173 ton on Natuna Sea at water depth 90 m with the significant wave is 53 m. The first stage of evaluation is to analyze the hydrodinamics motion to obtain the motion characteristics of the structure due to excitation wave. The second stage is to analyze the structure response due to excitation wave that is shear force and bending moment analysis performed in two condition that is at wave length 107 m and at wave length on T 100 years. The distibute load on the structure with plate thickness is 30 mm transformed into structure response than become stress on the structure. Analysis performed in three model that is structure semi-submersible without deck structure sei-submersible with rigid deck and strucutre semisubmersible with smeared deck. In each model obtained maximum stress 201 Mpa 155 Mpa and 121 Mpa in different locations. The largest stress in structure without deck is located in transverse beam near deck in column three in structure with deck rigid the largest stress located between column and pontoon in column three and the largest stress in structure semi-submersible with smeared deck the largest stress located in transverse beam inside pontoon under column one.



KeywordsSemi-submersible, Respon struktur, Shear force,Bending moment, Tegangan maksimum
 
Subject:  Struktur hidraulis
Contributor
  1. Prof. Ir. Eko Budi Djatmiko, M.Sc., Ph.D
  2. Dr. Eng. Rudi Walujo Prastianto, ST., MT.
Date Create: 22/02/2016
Type: Text
Format: PDF
Language: Indonesian
Identifier: ITS-paper-43121150008448
Collection ID: 43121150008448
Call Number: RSKe 627.98 Adi k


Source
Paper And Presentation Of Offshore Engineering RSKe 627.98 Adi k, 2016

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Copyright @2016 by ITS Library. This publication is protected by copyright and per obtained from the ITS Library prior to any prohibited reproduction, storage in a re transmission in any form or by any means, electronic, mechanical, photocopying, reco For information regarding permission(s), write to ITS Library




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ITS-paper-43121150008448-40276.pdf




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