Pratama, Widi Chalbi (2017) Analisis Ultimate Strength Struktur Jacket Platform Berbasis Keandalan dengan Variasi Jenis Tanah. Undergraduate thesis, Institut Teknologi Sepuluh Nopember Surabaya.
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Abstract
Dalam pertimbangan proses reuse jacket platform, salah satu hal yang dipertimbangkan adalah apakah daya dukung tanah di lokasi baru dapat mendukung struktur tersebut. Daya dukung tanah berkaitan erat dengan kondisi tanah atau seabed yang mana kondisinya tidak stabil. Ketidakstabilan kondisi seabed dan lingkungan ini akan mengakibatkan perbedaan kekuatan pada bangunan lepas pantai pada umumnya maupun pada pile pada khususnya pada saat bangunan lepas pantai tersebut beroperasi.
Oleh karena itu, pada tugas akhir ini dilakukan analisis keandalan jacket platform dalam kondisi ultimate dengan variasi jenis tanah yang didapatkan dari data tanah beberapa lokasi. Peluang kegagalan member akan digunakan dalam analisa keandalan dengan menggunakan metode Monte Carlo yang menggunakan Random Number
Generator(RNG). Sedangkan keandalan sistem diperoleh dengan metode Reliability Block Diagram (RBD). Diperoleh hasil RSR (Reserve Strength Ratio) terkecil pada struktur dengan tanah tipe X sebesar 2.412, diikuti dengan struktur dengan tanah tipe Y dan tipe Z secara berurutan. Struktur dengan tanah tipe X memiliki RSR terkecil dan nilai parameter-parameter tanah (unit end bearing dan unit
skin friction) terkecil. Analisis keandalan dilakukan pada 3 tipe tanah, dengan keandalan terkecil terjadi pada struktur dengan tanah tipe X sebesar 0.359. =========================================================================== In consideration of the jacket platform reuse process, one of the things to consider is whether the bearing capacity of the soil can support the structure. Pile is an important component of the bearing capacity of the soil, also one of the most vulnerable components. Pile is related to the soil or seabed condition which is unstable. The instability of the seabed and environmental conditions will result in differences of offshore structures strength as well as on piles when the offshore structures are in operation. Therefore, one way to find out whether the jacket platform structure is still feasible to operate with a particular soil type is to use analysis to find the largest unity check and pushover analysis to calculate the RSR (Reserve Strength Ratio) structure. In this final project, the jacket platform reliability with variation of soil type obtained from soil data of several locations. Probability of member failure will be calculated in reliability analysis using Monte Carlo method with Random Number Generator (RNG). While the reliability of the system obtained by Reliability Block Diagram (RBD). Based on structural strength analysis, the lowest RSR (Reserve Strength Ratio) is in type X soil structure with 2.412, followed by structure with type Y soil and type Z soil. The structure with type X soil has the lowest RSR and the lowest soil parameters (end bearing unit and skin friction unit). Reliability analyzes were performed on 3 soil types, with the lowest reliability occurring in type X soil structure with 0.359.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Uncontrolled Keywords: | Reuse, Pile, Monte Carlo, Realibility Block Diagram, Ultimate |
| 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: | Widi Chalbi Pratama |
| Date Deposited: | 12 Oct 2017 04:44 |
| Last Modified: | 08 Mar 2019 03:07 |
| URI: | http://repository.its.ac.id/id/eprint/45586 |
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