Displacement pada brace joint untuk Load Case JR18O-270MX
Displacement pada brace joint untuk Load Case JR18O-315MX
Node Joint
ANSYS MicroSAS x y z
50004 L128 8.70E-04 2.65E-03 -1.63E-03
50010 325 4.26E-04 1.95E-03 -1.01E-03
50038 181 2.16E-03 2.87E-03 4.34E-04
50026 225 1.48E-03 4.83E-03 7.35E-04
50032 L110 1.63E-03 3.28E-03 1.29E-03
50020 224 2.13E-03 2.75E-03 1.15E-03
Displacement (meter)
Displacement pada brace joint untuk Load Case JR03E-045MN
Displacement pada brace joint untuk Load Case JR18E-315MN
Node Joint
ANSYS MicroSAS x y z
50004 L128 4.80E-04 3.05E-03 -3.73E-03
50010 325 1.66E-04 2.22E-03 -3.32E-03
50038 181 4.49E-03 1.88E-03 3.03E-03
50026 225 2.26E-04 6.89E-03 1.72E-03
50032 L110 1.09E-03 2.58E-03 5.23E-03
50020 224 5.19E-03 -2.55E-03 5.24E-03
Displacement (meter)
1. ASME B31.4-2006, Pipeline Transportation Systems for Liquid Hydrocarbons and other Liquids.
Max. Allowable Von Mises Stress ≤ 0.9 Specified Minimum Yield Stregth
2. ABS Safehull-Dynamic Loading Approach’ for Floating Production, Storage and Offloading (Fpso) Systems 2001, for the ‘SH-DLA’ Classification Notation.
Max. Allowable Von Mises Stress ≤ 0.9 Specified Minimum Yield Stregth
3. ABS Mobile Offshore Drilling Units 2001, Part 3: Hull Construction and Equipment.
Von Mises Stress = Yield Stregth / Factor Safety
Factor Safety ≤ 1.11 untuk beban kombinasi
Tegangan Von Mises akibat load case JR18O-270MX
Von Mises Stress Yield Stress Displacement
Mpa Mpa ASME ABS meter
Jacket Leg 160 324 291.6 291.9 0.005 PASS
Top Yoke Plate 210 345 310.5 310.8 0.007 PASS
Flange Plate 22.8 345 310.5 310.8 0.006 PASS
Bottom Yoke Plate 121 324 291.6 291.9 0.007 PASS
Main Shear Plate 171 345 310.5 310.8 0.007 PASS
External Shear Plate 174 345 310.5 310.8 0.007 PASS
Skirt Sleeve 163 345 310.5 310.8 0.008 PASS
RemarkComponent of Skirt Pile SleeveAllowable Stress (Mpa)
1
MN
MX
X
Y
Z
14906
.234E+08.467E+08
.701E+08.934E+08
.117E+09.140E+09
.163E+09.187E+09
.210E+09
DEC 30 2010
00:44:24
NODAL SOLUTION
STEP=1
SUB =1
TIME=1
SEQV (AVG)
DMX =.007319
SMN =14906
SMX =.210E+09
Tegangan Von Mises akibat load case JR18O-315MX
Von Mises Stress Yield Stress Displacement
Mpa Mpa ASME ABS meter
Jacket Leg 171 324 291.6 291.9 0.006 PASS
Top Yoke Plate 220 345 310.5 310.8 0.009 PASS
Flange Plate 30.5 345 310.5 310.8 0.008 PASS
Bottom Yoke Plate 152 324 291.6 291.9 0.010 PASS
Main Shear Plate 178 345 310.5 310.8 0.009 PASS
External Shear Plate 201 345 310.5 310.8 0.009 PASS
Skirt Sleeve 121 345 310.5 310.8 0.010 PASS
Component of Skirt Pile Sleeve RemarkAllowable Stress (Mpa)
1
MN
MX
X
Y
Z
16470
.244E+08.488E+08
.733E+08.977E+08
.122E+09.146E+09
.171E+09.195E+09
.220E+09
DEC 30 2010
00:56:03
NODAL SOLUTION
STEP=1
SUB =1
TIME=1
SEQV (AVG)
DMX =.009279
SMN =16470
SMX =.220E+09
Tegangan Von Mises akibat load case JR03E-045MN
Von Mises Stress Yield Stress Displacement
Mpa Mpa ASME ABS meter
Jacket Leg 236 324 291.6 291.9 0.012 PASS
Top Yoke Plate 292 345 310.5 310.8 0.017 PASS
Flange Plate 57.8 345 310.5 310.8 0.014 PASS
Bottom Yoke Plate 193 324 291.6 291.9 0.023 PASS
Main Shear Plate 231 345 310.5 310.8 0.017 PASS
External Shear Plate 310 345 310.5 310.8 0.017 PASS
Skirt Sleeve 89.7 345 310.5 310.8 0.022 PASS
Component of Skirt Pile Sleeve RemarkAllowable Stress (Mpa)
1
MN
MX
.184E+07
.361E+08.704E+08
.105E+09.139E+09
.173E+09.208E+09
.242E+09.276E+09
.310E+09
DEC 30 2010
01:09:03
NODAL SOLUTION
STEP=1
SUB =1
TIME=1
SEQV (AVG)
DMX =.017038
SMN =.184E+07
SMX =.310E+09
Tegangan Von Mises akibat load case JR18E-315MN
Von Mises Stress Yield Stress Displacement
Mpa Mpa ASME ABS meter
Jacket Leg 180 324 291.6 291.9 0.007 PASS
Top Yoke Plate 231 345 310.5 310.8 0.012 PASS
Flange Plate 39.3 345 310.5 310.8 0.010 PASS
Bottom Yoke Plate 210 324 291.6 291.9 0.014 PASS
Main Shear Plate 188 345 310.5 310.8 0.010 PASS
External Shear Plate 273 345 310.5 310.8 0.010 PASS
Skirt Sleeve 121 345 310.5 310.8 0.014 PASS
Component of Skirt Pile Sleeve RemarkAllowable Stress (Mpa)
1
MNMX
758312
.310E+08.612E+08
.914E+08.122E+09
.152E+09.182E+09
.212E+09.242E+09
.273E+09
DEC 30 2010
01:20:14
NODAL SOLUTION
STEP=1
SUB =1
TIME=1
SEQV (AVG)
DMX =.01047
SMN =758312
SMX =.273E+09
Kritis
◦ Load Case JR18O-270MX (operasional)
◦ Load Case JR18O-315MX (operasional)
◦ Load Case JR03E-045MN (ekstrem)
◦ Load Case JR18E-315MN (ekstrem)
JR03E-045MN → Nilai Tegangan von mises terbesar →external shear plate = 310 Mpa ≤ tegangan ijin sebesar310.5 dan 310.8 MPa pada code ASME dan ABS.
JR03E-045MN → Nilai displacement terbesar → bottomyoke plate = 0.023 meter
Syarat batas tidak seharusnya fix karena dimungkinkan adanya sifat
pegas dan redam dari bagian jacket yang tidak dimodelkan sehingga
didapatkan hasil yang mendekati kondisi lapangan.
Hasil yang diperoleh akan lebih mendekati nilai yang sebenarnya
jika karakteristik grout diterapkan pada pemodelan local dengan
menggunakan elemen dan parameter yang dapat mewakili sifat
grout.
Mesh yang lebih kecil lebih dianjurkan untuk mendapatkan hasil
yang lebih akurat tentunya dengan melakukan Mesh sensitivity
Analysis terlebih dahulu.
Menggunakan pendekatan substructure pada bagian skirt pile.
American Institute of Steel Construction, 1989, Allowable Stress Design Manual 9th
Edition. American Petroleum Institute, 2002, Recommended Practice For Planning and
Constructing Fixed Offshore Platform - Working Stress Design, API Recommended Practice 2A (RP 2A) WSD.
ANSYS Multiphysics 12, 2009, User Manual Guide, Ansys Inc.
Barltrop, N. D. P., 1988, Floating Structures: a guide for design analysis Volume One, Ledbury. England: The Centre for Marine and Petroleum Technology.
Chakrabarti, S. K., 1987, Hydrodynamics of Offshore Structure, Southampton, Boston USA: Computational Mechanics Publications.
Chakrabarti S. K., 2005, Handbook of Offshore Engineering, Plainfield, Illinois, USA: Elsevier.
Coyle, H. M., et al, 1966, Soil Mechanics and Foundations Division for Load Transfer for Axially Loaded Piles in Clay, ASCE Journal, Vol. 92, No. 1052.
Coyle, H. M., et al, 1967, Skin Friction for Steel Piles in Sand, Journal of the Soil Mechanics and Foundation Division, Proceedings of the American Society of Civil Engineers, Vol. 93, No. SM6, November, 1967, p. 261–278.
Dean, R. G., 1965, Stream Function Representation of Non-Linear Ocean Waves, Journal of Geophysical Research, Vol. 70. pp. 4561-4572.
Gerwick,Ben C. Jr., 2000, Construction of Marine and Offshore Structures Second Edition, Washington, D. C: CRC press.
Hastanto, E. S., 2005, Analisa Ultimate Strenght Struktur Jacket LE Berbasis Keandalan, Jurusan Teknik Kelautan, FTK-ITS, Surabaya.
http://www.naturalgas.org/naturalgas/extraction_offshore.asp, 11 januari 2011.
Kraft, et al, 1981, Lateral Pile Response During Earthquakes, Journal of the Geotechnical Engineering Division, ASCE, Vol. 109, No. GT12, Paper No. 16735, December 1981.
McClelland, 1986, Planning and Design of Fixed Offshore Platforms, Van Nostrand Reinhold Company: New York.
McDermott, 2008, Structural Basis of Design, Document No.: R2312-22-ST-BOD-00001.
MicroSAS, 2007, User Manual Guide, McDermott Inc. USA.
Mohd Nor, NK, 1996, FE Analysis of an Integrated Plate Connection between Jacket Structure and Skirt-Pile Sleeve, Report 96:9, Master Thesis, Department of Structural Mechanics, Chalmers University of Technology, Sweden.
Morison, J. R., et al, 1950, The Force Exerted by Surface Waves on Piles, Petroleum Transactions, American Institute of Mining and Metal Engineering, Vol. 4, pp. 11-22.
Pogonowski, 1972, Reversed Slope Skirt Pile Marine Platform Anchoring, United states Patent, Texaco Inc., New York.
Popov, E. P., 1993, Mekanika Teknik, Jakarta: Penerbit Erlangga.
Vijayvergia, V.N., 1977, Load Movement Characteristics of Piles, Proceedings of the Ports‘77 Conference, American Society of Civil Engineers, Vol. II, p. 269–284.
Will, 1987, Composite Leg Platform, United States Patent, McDermott Inc., New Orleans.
TERIMA KASIH
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