Analisis Plastisitas Member Modifikasi Pada Jacket Platform Akibat Beban Runtuh Lingkungan

Murti, Gandhi Wisnu Hari (2021) Analisis Plastisitas Member Modifikasi Pada Jacket Platform Akibat Beban Runtuh Lingkungan. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Penurunan produksi migas di Indonesia terjadi karena banyaknya platform yang tidak mampu
bekerja secara optimal karena sudah berumur melebihi 20 tahun sehingga dapat dikategorikan
sebagai struktur tua karena sudah melebihi masa operasinya dan telah mengalami penurunan
kekuatan sehingga bisa mengakibatkan keruntuhan pada platform (collapse). Keruntuhan itu
dapat terjadi karena terbentuknya member plastis dengan tegangan melebihi tegangan yield
yang mengakibatkan member berdeformasi secara plastis dan rawan terjadi kegagalan. Oleh
karena itu analisa untuk mengetahui kekuatan ultimate dan karakteristik plastisitas member
penting untuk dilakukan. Pada penelitian Tugas Akhir ini platform yang digunakan adalah
platform MBH yang merupakan jacket 3 kaki dengan jenis wellhead platform yang telah
dimodifikasi agar didapatkan hasil sesuai kriteria yang ditetapkan. Hasil dari analisa kekuatan
ultimate didapatkan RSR minimum 2 akibat arah pembebanan 270o
dengan member yang
mengalami plastisitas paling awal adalah horizontal bracing (0005-011X). Tegangan
maksimum yang terjadi pada saat collapse (plastic ratio 100%) adalah 43987 psi dengan
deformasi maksimum sebesar 6.2391 in. kesimpulan yang dapat diambil dalam penelitian ini
adalah struktur mengalami keruntuhan dengan tegangan melebihi tegangan yield dari baja A36.
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The decreased of oil and gas production in Indonesia occurs because many platforms are unable
to work optimally because they are more than 20 years old so that they can be categorized as
old structures because they have exceeded their service life and have decreased in strength so
that they can result in a collapse of the platform. The collapse can occur due to the formation
of a plastic member with a stress that exceeds the yield stress which results in the plastic
deformation of the member and is prone to failure. Therefore, the analysis to determine the
ultimate strength and plasticity characteristics of the members is important to do. In this
research, the platform that used is the MBH platform which is a 3 leg jacket wellhead platform
type with a modified in order to obtain results according to the specified criteria. The results of
the ultimate strength analysis obtained a minimum RSR of 2 due to the direction of loading
270o with the earliest plasticity member was horizontal bracing (0005-011X). The maximum
stress that occurs at the time of collapse (100% plastic ratio) is 43987 psi with a maximum
deformation of 6.2391 in. The conclusion in this research of final project is that the structure
has collapsed with stresses exceeding the yield stress of A36 steel.

Item Type:	Thesis (Undergraduate)
Uncontrolled Keywords:	Platform, Plastic, Collapse, RSR, Yield, Platform, Plastis, Runtuh, RSR, yield
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:	Gandhi Wisnu Hari Murti
Date Deposited:	12 Aug 2021 14:47
Last Modified:	12 Aug 2021 14:47
URI:	http://repository.its.ac.id/id/eprint/85985

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