Setiarini, Krisytha Prawesti (2017) Analisa Tegangan Ultimate Pada Platform Terpancang Akibat Beban Runtuh (Studi Kasus L-Com Well Platform). Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Struktur di perairan Indonesia khususnya jenis fixed jacket platform sebagian besar telah beroperasi melebihi umur operasi (service life). Dengan masa operasi yang telah melewati service life maka perlu dilakukan analisa ultimate strength untuk mengetahui kekuatan cadangan struktur tersebu agar struktur dapat beroperasi secara aman pada sisa umur operasinya. Pada penelitian ini struktur yang digunakan adalah L-COM Well Platform milik Pertamina Hulu Energi Offshore North West Java. Keruntuhan struktur terjadi karena terbentuknya member plastis. Member yang mengalami plastisitas terlebih dahulu akan dilakukan analisa lokal untuk mengetahui sebaran plastic hinge dan tegangan yang ada pada member tersebut dengan menggunakan finite element. Hasil dari analisa ultimate strength didapatkan RSR (Reserve Strength Ratio) terkecil pada arah pembebanan 315° sebesar 6.46 dan member yang mengalami plastisitas terlebih dahulu adalah member horizontal brace 486-407. Sedangkan tegangan maksimum member pada saat collapse sebesar 1663.5 Ksi dan tegangan rata-rata sebesar 121.45 Ksi. Jadi kesimpulan dari penelitian ini bahwa struktur mengalami keruntuhan setelah melewati kondisi plastis dan tegangan ultimatenya.
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Offshore structure
s
in Indonesia
,
especially
the type of fixed offshore structure
s have
operated beyond its
serfice life
or categorized as an old structure
. Offshore structure
which
excee
d
ed
the service life, needs
ultimate strength
analyzing to know reserve
strength ratio.
In order to
the offshor
e structure can operate safely
in
the
remain
ing
of
service life extention.
In this final project used L
-
COM Well Platform owned by
Pertamina Hulu Energi Offshore North West Java.
Collapsed structure was happening
when
member formed plastic.
The greatest member plastic hinge or earliest member
plasti
c in collapsed increment
would retrieve to local analysis to know the
plastic
hinge
distribution and
stress in member plastic using finite element.
On
ultimate
strength analysis
, the result of
smallest
RSR (Reserve Strength Ratio) in the direction
of loading 315° is
6.46
and
the earliest member plastic
is horizontal brace 486
-
407.
The
ultimate stress of member 486
-
407 is 1663.5 ksi and the average stress is 121.45
Ksi. So the conclusion in this final pr
oject
that the structure collapsed after had
passed through plastic condition and ultimate stress
.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Uncontrolled Keywords: | Service Life, Ultimate, Plastic Hinge, Finite Element, Reserve Strength Ratio, Collapse |
| Subjects: | T Technology > TC Hydraulic engineering. Ocean engineering T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures |
| Divisions: | Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis |
| Depositing User: | Krisytha Prawesti Setiarini |
| Date Deposited: | 07 Nov 2017 04:52 |
| Last Modified: | 08 Mar 2019 03:54 |
| URI: | http://repository.its.ac.id/id/eprint/44740 |
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