STUDI KARAKTERISTIK RESPON STRUKTUR AKIBAT EKSITASI GELOMBANG PADA SEMI-SUBMERSIBLE DRILLING RIG DENGAN DUA KOLOM MIRING DAN PONTON PERSEGI EMPAT

PUTRO, DANTYO SAH (2014) STUDI KARAKTERISTIK RESPON STRUKTUR AKIBAT EKSITASI GELOMBANG PADA SEMI-SUBMERSIBLE DRILLING RIG DENGAN DUA KOLOM MIRING DAN PONTON PERSEGI EMPAT. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Studi karakteristik respon struktur pada semi-submersible drilling rig perlu dilakukan
sebelum sebuah anjungan dioperasikan di lapangan dengan tujuan untuk mengetahui
seberapa besar kemampuan struktur tersebut menerima beban gelombang. Dari hal itu
kemudian akan dapat diketahui keamanan dari struktur semi-submersible tersebut. Studi
dalam penelitian ini telah dilakukan terhadap enam variasi rancangan semi-submersible
dengan konfigurasi penampang kolom dan ponton berbentuk persegi empat, berukuran
displasemen 24144 ton, yang dioperasikan di perairan Natuna dan North Sea. Enam
variasi mempunyai konfigurasi dua kolom miring per ponton, yang dinamakan
DUOVAR-A 10, DUOVAR-A 20, DUOVAR-A 30, DUOVAR-B 10, DUOVAR-B 20, dan
DUOVAR-B 30. Komputasi respon struktur diselesaikan melalui integrasi kombinasi
distribusi massa struktur dan distribusi beban hidrodinamik akibat gerakan di
gelombang. Komputasi menghasilkan enam komponen respon, yang terdiri dari tiga
komponen gaya geser, yakni longitudinal (LSF), transversal (TSF), dan vertical (VSF), dan
tiga komponen momen, yakni momen lengkung melintang (TBM), momen lengkung
memanjang (LBM), dan momen torsi vertikal (VTM). Berdaasrkan hasil dari (LSF),
(TSF), (VSF), (TBM), (LBM), dan (VBM) maka dari keenam semi-submersible tersebut
DUOVAR-B 20 yang memiliki nilai shear force dan bending moment lebih kecil dari pada
variasi semi-submersible lainnya, sehingga semi-submersible DUOVAR-B 20 lebih baik
digunakan dibandingkan dengan kelima semi-submersible yang lain.

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A study to characterize the structural responses on semi-submersible drilling rigs
needs to be carried out prior to the operation of the platforms on site, with the
aims at identifying the structural capacity under the primary wave loads. By
realizing this one would then comprehend on the safety of the corresponding
semi-submersible structures. The study in this research was carried out on six
variations of semi-submersible design configured with rectangular section for the
columns and pontoons, sized 24144 tons in displacement, to be operated at Natuna
Sea and North Sea. Six variations were designed with two columns per pontoon,
named DUOVAR-A 10, DUOVAR-A 20, DUOVAR-A 30, DUOVAR-B 10,
DUOVAR-B 20, and DUOVAR-B 30. Computation of structural responses was
accomplished through the integration of combination between structural mass
distribution and hydrodynamic load distribution due to motions in waves. The
computation yields six response components, comprising three shear force
components, namely longitudinal (LSF), transversal (TSF), and vertical (VTF),
and three moment components, that is transverse bending moment (TBM),
longitudinal bending moment (LBM), and yaw torsional moment (YTM). The
first approach in the design of semi-submersible structure may be accomplished
by considering the TBM, which should be resisted by the transverse deck
structure that is recognized as the somewhat weakest primary structural
component. By considering these results it is therefore possible to design the
transverse deck structure of the semi-submersible DUOVAR-B 20 to have a lower
shear force and bending moment, thus it will be essentially lighter in comparison
with the other five semi-submersibles.

Item Type:	Thesis (Undergraduate)
Additional Information:	RSKe 627.98 Put s
Uncontrolled Keywords:	Semi-Submersible, Respon Struktur, Gaya Geser, Momen
Subjects:	G Geography. Anthropology. Recreation > GC Oceanography
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User:	Anis Wulandari
Date Deposited:	12 Jan 2017 07:42
Last Modified:	12 Jan 2017 07:42
URI:	http://repository.its.ac.id/id/eprint/1515

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