ANALISA DINAMIS JACKET FIXED PLATFORM AKIBAT TUBRUKAN KAPAL BERBASIS RESIKO STUDI KASUS : BEKAPAI QUARTERS PLATFORM

HERMAWAN, ASHARVIYAN RIDZKY (2016) ANALISA DINAMIS JACKET FIXED PLATFORM AKIBAT TUBRUKAN KAPAL BERBASIS RESIKO STUDI KASUS : BEKAPAI QUARTERS PLATFORM. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Analisa dinamis yang dilakukan pada struktur Bekapai Quarters Platform didasari oleh adanya permasalahan pada keamananan para personil yang bekerja pada platform tersebut. Tubrukan dari kapal yang akan bersandar mengakibatkan struktur berpindah cukup jauh dari posisi semula. Analisa dilakukan sebagai dasar evaluasi dan perencanaan mitigasi untuk mengurangi peluang terjadinya kegagalan struktur. Kegagalan struktur ditinjau dari kedalaman dent member akibat tubrukan kapal. Analisa dinamis struktur ditinjau dari respon gerak dinamis struktur yang berupa displacement, kecepatan, dan percepatan. Respon dinamis struktur berhubungan dengan kedalaman dent. Dent terjadi akibat struktur menyerap energi tubrukan, sehingga terjadi deformasi plastis pada member yang terkena tubrukan kapal. Dari hasil analisa yang telah dilakukan, didapatkan energi tubrukan kapal terbesar adalah 0,205 MJ. Energi tubrukan kapal dihasilkan dari tubrukan supply vessel dengan berat 1107 ton yang bergerak dengan kecepatan 0- 1 knot pada arah tubrukan 10o-40o dari sisi boatlanding. Respon dinamis struktur ditinjau pada joint di pusat gravitasi struktur dan joint pada pusat main deck sebagai representasi perpindahan struktur yang dirasakan oleh personil. Didapatkan hasil respon dinamis mengikuti bentuk grafik eksponensial. Jarak antara main deck dengan pusat gravitasi struktur cukup jauh, sehingga respon dinamis struktur Bekapai Quarters Platform cukup besar. Kecepatan tubrukan kapal juga mempengaruhi besarnya respon dinamis struktur. Respon dinamis terbesar dihasilkan dari tubrukan kapal pada arah 250o dari utara platform dengan kecepatan tubrukan 1 knot dan kedalaman dent 13,83 cm. Peluang terjadinya kegagalan struktur mencapai 0,083147 dan struktur termasuk dalam kategori medium risk. Mitigasi yang direkomendasikan adalah dengan menambah wall thickness member pada daerah boatlanding untuk menekan peluang terjadinya kegagalan struktur. ====================================================================================================== Dynamic analysis was performed on structure based on the existence Bekapai Quarters Platform's security problem which might harm personnel safety. Structure displacement caused by ship impact while docking on platform would increase probability of structural failure in the ship impact area. The analysis was carried out as a basis for evaluation and mitigation plan to reduce the probability of structural failure. The structural failure based on the depth of member’s dent due to ship impact. Dynamic analysis based on dynamic motion response of structure represented by displacement, velocity, and acceleration. Dynamic motion response of structures related to the depth of member’s dent. Dent occur as a result of the impact energy absorbed by structure, resulting in plastic deformation in areas of affected member. From the analysis that has been done, the biggest ship impact energy was 0.205 MJ. Ship impact energy generated from the supply vessel with a weight of 1107 tons moving at 0-1 knots in direction between 10o-40o from boatlanding. Dynamic motion response structure is reviewed on a joint located at structure’s center of gravity and joint the center of the main deck as a representation of structure displacement felt by the personnel. The structure’s dynamic response was exponential. Distance between main deck and structure’s center of gravity was too distant and it would make structure had big dynamic response. The biggest dynamic response was made by ship moving at 1 knot in 250o from north platform. It made member has 13.83 cm of dent depth. The structure’s probability of failure reached 0.083147 and counted on medium risk category. Recommended mitigation to suppress the probability of failure was by increase the wall thickness of member on boatlanding area.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: tubrukan, dinamis, displacement, dent, kegagalan struktur
Subjects: T Technology > T Technology (General)
T Technology > TC Hydraulic engineering. Ocean engineering
Divisions: Faculty of Marine Technology > Ocean Engineering > (S1) Undergraduate Theses
Depositing User: Mr. Fandika aqsa
Date Deposited: 11 Jan 2017 06:24
Last Modified: 26 Dec 2018 08:36
URI: http://repository.its.ac.id/id/eprint/1472

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