Perumusan Faktor Konsentrasi Tegangan pada Sambungan Tubular Multiplanar K Double T dengan Pembebanan Aksial Menggunakan Metode Elemen Hingga

Widhestomo, Sofyan Wahyu (2018) Perumusan Faktor Konsentrasi Tegangan pada Sambungan Tubular Multiplanar K Double T dengan Pembebanan Aksial Menggunakan Metode Elemen Hingga. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Struktur anjungan lepas pantai terpancang yang beroperasi akan terkena beban berulang pada bagian jacket platform yang mengakibatkan adanya pembesaran tegangan pada daerah sambungan antara brace dan chord. Tegangan makismum pada daerah ini disebut hot-spot stress. Hot-spot stress dapat memacu percepatan timbulnya kelelahan pada struktur, dan besarnya dipengaruhi oleh parameter yang disebut stress concentration factor (SCF). Tugas Akhir ini melakukan analisis tentang efek dari variasi parameter non-dimensional (beta, tau, gamma,dan teta) terhadap distribusi tegangan di sekitar garis sambungan antara brace dan chord serta nilai SCF yang dihasilkan. Selain itu, tugas akhir ini juga akan merumuskan SCF dengan metode regresi. Hasil dari analisis ini menunjukkan bahwa semakin besar parameter beta dan teta maka tegangan di sekitar sambungan akan semakin kecil, sebaliknya semakin besar parameter tau dan gamma maka tegangan disekitar sambungan akan semakin besar. Analisis terhadap nilai SCF menunjukkan bahwa semakin besar parameter beta, tau, gamma maka tegangan nominal akan semakin kecil sehingga nilai SCF akan semakin besar, sedangkan semakin besar parameter teta tidak akan berpengaruh terhadap besar tegangan nominal sehingga SCF akan semakin kecil. Presentase error rata-rata SCF yang didapatkan dari persamaan baru dan SCF dari hasil analisis metode elemen hinggga cukup kecil, sehingga persamaan baru tersebut dapat dikatakan valid. ====================================================================================================== An operating fixed offshore structure platform is subjected to cyclic loads, causing a concentration of stresses at intersections between brace and chord. The maximum stress at the intersection between a brace and a chord is called the hot-spot stress. Hot-spot stress can accelerate fatigue in the structure and the magnitude is affected by parameter called stress concentration factor (SCF). This final project analyzes effect of non-dimensional parameters variation (beta, tau, gamma, and theta) on stress distribution around the intersection between brace and chord. It also generates SCF values. In addition, this final project also formulates SCF with regression method. Results of this analysis indicate that the escalation of the beta and theta leads to derivation of stress around intersection between brace and chord, while an increase in tau and gamma leads to escalation of stress around the intersection between brace and chord. Analysis on SCF values indicates that the escalation beta, tau, gamma leads to derivation of nominal stress so SCF values will be greater, while the increase in theta will not affect nominal stress magnitudes so the SCF value will be smaller. Average error of SCF obtained from equation and SCF from finite element method is small, so new SCF equation can be accepted.

Item Type: Thesis (Undergraduate)
Additional Information: RSKe 627.98 Wid p-1
Uncontrolled Keywords: sambungan tubular multiplanar, tegangan hot-spot, faktor konsentrasi tegangan, perumusan SCF, metode elemen hingga
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TA Engineering (General). Civil engineering (General) > TA347 Finite Element Method
T Technology > TA Engineering (General). Civil engineering (General) > TA460 Metals--Fatigue.
T Technology > TA Engineering (General). Civil engineering (General) > TA492.W4 Welded joints
T Technology > TA Engineering (General). Civil engineering (General) > TA645 Structural analysis (Engineering)
T Technology > TC Hydraulic engineering. Ocean engineering
T Technology > TC Hydraulic engineering. Ocean engineering > TC1665 Offshore structures--Materials.
T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures
Divisions: Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User: Sofyan Wahyu Widhestomo
Date Deposited: 17 Feb 2021 04:01
Last Modified: 17 Feb 2021 04:01
URI: https://repository.its.ac.id/id/eprint/53927

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