Izzuddin, Mohammad (2021) Analisis Pushover Jacket Platform 3 Kaki Berbasis Keandalan Terhadap Pengaruh Scouring. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
Preview |
Text
04311740000005-Undergraduate_Thesis.pdf - Accepted Version Download (7MB) | Preview |
Abstract
Menurut International Energy Agency-IEA (2008), hingga tahun 2030 sekitar 80%
kebutuhan energi dunia dipasok dari bahan bakar fosil yaitu minyak bumi dan gas. Oleh
karena itu, dibutuhkannya anjungan jacket platform untuk proses eksploitasi. Selain itu, perlu
mempertimbangkan peningkatan efisiensi kinerja dari struktur jacket dan pengurangan biaya
produksi dengan tujuan agar struktur mampu digunakan kembali dan mudah dipindahkan,
mengingat biasanya desain offshore jacket platform dirancang secara konservatif dan
berukuran cukup besar. Namun permasalahan utama justru terletak pada beban gempa dan
faktor dinamis akibat beban lingkungan terutama arus yang menyebabkan scouring. Kedua
hal ini akan sangat berpengaruh terhadap daya dukung pile akibat hilangnya cengkraman pada
pondasi struktur dan akibat beban lateral impulsif gempa yang cukup signifikan. Maka dari itu
penulis akan melakukan analisis sesimik kemudian melanjutkan menganalisis keruntuhan
(Pushover analysis) terhadap variasi Peak Ground Acceleration (PGA) dengan kombinasi
variasi kedalaman scouring berbasis keandalan untuk mendapatkan nilai Reserve Strength
Ratio (RSR) dan System Redudancy (SR) dengan incremental lateral load yaitu beban gempa
hingga struktur mengalami keruntuhan total. Dari hasil analisis seismic didapatkan bahwa
terdapatnya member overstress pada PGA 0,6g sehingga diperoleh RSR terkecil terjadi pada
arah pembebanan lateral sumbu Y dengan kedalaman scouring 21 m dengan nilai 3,21 dengan
nilai SR 1,07 dan keandalan strukturnya yaitu 0,681. Reliability index pada struktur minimum
terjadi pada PGA 0,6g dan pada kedalaman scouring 9,5 m.
=====================================================================================================
According to the International Energy Agency-IEA (2008), by 2030 about 80% of the
world's energy needs are supplied from fossil fuels, namely petroleum and gas. Therefore, the
platform jacket platform is needed for the exploitation process. In addition, it is necessary to
consider improving the performance efficiency of the jacket structure and reducing
production costs with the aim of making the structure reusable and easy to move, considering
that usually the offshore jacket platform design is conservatively designed and quite large.
But the main problem lies precisely in the load of earthquakes and dynamic factors due to
environmental loads, especially currents that cause scouring. Both of these, it will be greatly
affect the carrying capacity of the pile due to the loss of grip on the foundation of the
structure and due to the impulsive lateral load of a significant earthquake which is cause
collapsed. Therefore, the author will conduct a seismic analysis and then continue analyzing
the collapse (Pushover analysis) of peak ground acceleration (PGA) variations with a
combination of reliability-based scouring depth variations to obtain a Reserve Strength Ratio
(RSR) and System Redudancy (SR) value with incremental lateral earthquake load until the
structure is completely collapsed. From the results of seismic analysis obtained that there is a
member overstress on the PGA 0.6g so that obtained the smallest RSR occurs in the direction
of lateral loading of the Y axis with a scouring depth of 21 m with a value of 3.21 with a value
of SR 1.07 and the reliability of the structure is 0.681. Reliability index at minimum structure
occurs at PGA 0.6g and at scouring depth of 9.5 m.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Uncontrolled Keywords: | Jacket, Keandalan, Pushover, Scouring, Seismik, Jacket, Pushover, Reliability, Scouring, Seismic. |
| 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: | Mohammad Izzuddin |
| Date Deposited: | 12 Aug 2021 03:45 |
| Last Modified: | 14 Oct 2024 08:32 |
| URI: | http://repository.its.ac.id/id/eprint/85887 |
Actions (login required)
 |
View Item |