Analisis Lokal Balok Load-out Support Frame (LSF) dan Sling pada Proses Turn-over Lifting

Wahyudi, Thania Elisabeth (2025) Analisis Lokal Balok Load-out Support Frame (LSF) dan Sling pada Proses Turn-over Lifting. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Offshore wind farm (OWF) menjadi salah satu solusi kebutuhan energi dunia yang terus meningkat. Peningkatan produksi OWF, disertai dengan proses fabrikasi jacket, substation, hingga temporary support untuk proses load-out. Load-out dengan cara skidding membutuhkan bantuan load-out support frame (LSF) sebelum topside atau module duduk di atas skidshoes. Proyek Beta-Tennet 2 GW dengan dimensi 105,156 x 40,234 meter membutuhkan LSF dengan dimensi yang tidak kalah besar pula. Kondisi ini menjadi keterbatasan fabrikator sehingga dibuat sequence fabrikasi yang lebih kecil menjadi 4 row dan 20 balok, serta tiap balok memiliki tiga bagian. Desain geometri yang masif menyebabkan fabrikator harus melaksanakan prosedur turn-over lifting untuk mengatur posisi penyambungan struktur tiap bagian, kemudian diputar sejauh 180° menuju posisi final. Oleh sebab itu, dilakukan analisis turn-over lifting pada lower dan upper part LSF blok B-G1. Analisis global pada software SACS menggunakan metode elemen hingga menghasilkan unity check (UC) maksimum 0,9057 pada plat A772 di kemiringan 30° untuk bagian lower part dan 0,987 pada pelat R978 di kemiringan 60° (dua hook point) untuk bagian upper part. Selain UC, diketahui respon tension sling maksimum 83,89 kN di kemiringan 75° untuk lower part dan 322,352 kN di kemiringan 165° untuk upper part. Selanjutnya dilakukan analisis secara lokal menggunakan software Abaqus dan didapatkan tegangan von mises sebesar 17,3 MPa pada padeye SWL 40 mT dan 28,33 MPa untuk padeye SWL 100 mT. Dengan semua beban yang bekerja pada struktur maupun sling, kondisi integritas sling tetap aman. Pada sling Ø26 mm dan Ø42 mm berturut-turut hanya terjadi tension 18,23% dan 27,39% dari kapasitas maksimalnya. Selain itu, sudut yang terbentuk antara lengkungan sling dengan flange adalah 45°, yang mana sesuai rekomendasi praktis.
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Offshore wind farms (OWF) are becoming one of the solutions to the world's growing energy needs. The increase in OWF production is accompanied by the fabrication of jackets, substations, and temporary support for the load-out process. Load-out by skidding requires the assistance of a load-out support frame (LSF) before the topside or module sits on the skidshoes. The Beta-Tennet 2 GW project with dimensions of 105.156 x 40.234 meters requires LSFs with equally large dimensions. This condition is a limitation for the fabricator so that a smaller fabrication sequence is made into 4 rows and 20 beams, and each beam has three parts. The massive geometry design caused the fabricator to carry out a turn-over lifting procedure to adjust the structural connection position of each part, then rotated 180° to the final position. Therefore, a turn-over lifting analysis was performed on the lower and upper parts of LSF block B-G1. Global analysis in SACS software using the finite element method resulted in a maximum unity check (UC) of 0.9057 on plate A772 at 30° inclination for the lower part and 0.987 on plate R978 at 60° inclination (two hook points) for the upper part. In addition to UC, it is known that the maximum sling tension response is 83.89 kN at a slope of 75° for the lower part and 322.352 kN at a slope of 165° for the upper part. Furthermore, a local analysis was conducted using Abaqus software and von mises stresses of 17.3 MPa were obtained for the 40 mT SWL padeye and 28.33 MPa for the 100 mT SWL padeye. With all loads acting on the structure and sling, the integrity condition of the sling remains safe. In the 26 mm and 42 mm slings , only 18.23% and 27.39% of their maximum capacity were strained, respectively. In addition, the angle formed between the arch of the sling and the flange is 45°, which is in accordance with practical recommendations.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Load-out Support Frame, Metode Elemen Hingga, Turn-over Lifting, finite element method, FEM, MEH, analisis, lokal, local analysis, LSF, crane, sling, shackle, lifting, abaqus, sacs, pelat, plat, meshing, flange
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA347 Finite Element Method T Technology > TA Engineering (General). Civil engineering (General) > TA645 Structural analysis (Engineering) T Technology > TA Engineering (General). Civil engineering (General) > TA658 Structural design T Technology > TC Hydraulic engineering. Ocean engineering > TC1665 Offshore structures--Materials.
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User:	Thania Elisabeth Wahyudi
Date Deposited:	24 Jan 2025 03:52
Last Modified:	24 Jan 2025 03:52
URI:	http://repository.its.ac.id/id/eprint/116794

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