Nonlinear Analysis of Offshore Structures

Nonlinear Analysis of Offshore Structures

by B. Slallerud, J. Amdahl
ISBN-10:
0863802583
ISBN-13:
9780863802584
Pub. Date:
11/01/2001
Publisher:
Research Studies Press Limited

Hardcover

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Overview

Nonlinear Analysis of Offshore Structures

During the last decade the importance of accounting for nonlinear effects has increased due to higher utilization and extended service lives of offshore structures. This book presents new methods for advanced analysis of offshore structures that have evolved.

The basic principles of continuum mechanics and finite element methods are presented. The main focus is placed on the behaviour of typical offshore components, for example: tubular beams/beam-columns and joints, stiffened plates, jacket, jack-ups and semi-submersibles.

The authors have gained extensive experience through research and development in the areas of ultimate strength and progressive collapse analysis of offshore structures. Over the past two decades they have carried out laboratory testing of structural components and sub-systems; developed software for numerical analysis and have been involved with the practical design of structures to withstand accidental events.

Product Details

ISBN-13: 9780863802584
Publisher: Research Studies Press Limited
Publication date: 11/01/2001
Series: Civil and Structural Engineering Ser.
Pages: 340
Product dimensions: 6.50(w) x 1.50(h) x 9.50(d)
Age Range: 18 Years

Table of Contents

1Introduction1
1.1Capacity of offshore structures1
1.2Nonlinear analysis6
1.3Outline of the present study8
2Basic continuum mechanics and finite element procedures11
2.1Description of motion. Strain measures11
2.2Elastic and plastic strains19
2.3Principle of virtual power. Stress measures21
2.4Stress rates25
2.5Incremental virtual power26
2.6Elasto-plasticity29
2.7Discretisation with finite elements. Matrix form of virtual power33
2.8Beam and shell finite element modelling38
2.9Stress updates. Stress resultant plasticity44
2.10Solution methods. Static problems50
2.11Dynamic problems55
References57
3Modelling of tubular members61
3.1Elasto-plastic models61
3.2Cantilever elastica/inelastica64
3.3Instabilities in tubular members66
3.4Cyclic loading76
3.5Fracture of cracked members83
References87
4Modelling of tubular joints91
4.1Introduction91
4.2Modelling of strength and stiffness92
4.3Cyclic loading102
4.4Cracked joints107
References110
5Ultimate strength analysis113
5.1Introduction113
5.2Actions114
5.3Elastic-plastic analysis of frames and truss-works117
5.3.1Portal frame117
5.3.2X-brace system120
5.4Pushover analysis of jackets126
5.5Case study130
5.6Effect of imperfections132
5.6.1Source of imperfections132
5.6.2Initial imperfection pattern135
5.7Effect of nonlinear tubular joint behaviour136
5.7.1Elastic joint flexibility137
5.7.2Nonlinear joint modelling138
5.8Effect of nonlinear soil behaviour143
References146
6Integrity assessment of jacket structures under extreme storm cyclic loading149
6.1Introduction149
6.2Collapse limit states150
6.3Shakedown theorems151
6.4Cyclic loading of offshore structures153
6.5Acceptance criteria154
6.5.1Pushover analysis154
6.5.2Cyclic loading156
6.6Case Study158
6.6.1Effect of short term variability factor161
6.6.2Effect of local buckling162
6.6.3Effect of joint non-linearity163
6.7Recommended procedures165
References166
7Ship Collision169
7.1Introduction169
7.2Design principles170
7.3Force-deformation relationships for ships171
7.4Local denting of tubular members173
7.5Beam deformation models177
7.5.1Example: Supply vessel impact179
7.6Local buckling182
7.7Joint capacity184
7.8Tensile fracture185
7.9Case studies190
7.9.1Impact modelling190
7.9.2Jack-up191
7.9.3Jacket195
7.10Collision with large diameter columns199
7.11High energy collision201
7.11.1Impact scenarios201
7.11.2Analysis procedure202
7.11.3Collision damage for selected events202
7.11.4Design considerations209
7.11.5Ship crushing211
References215
8Accidental fires217
8.1Fire as a phenomenon217
8.1.1Liquid fires217
8.1.2Gas fires217
8.1.3Fire scenarios218
8.2Design philosophy218
8.2.1Performance criteria to meet functional requirements218
8.3Fire process analysis220
8.4Heat transfer analysis221
8.4.1Conduction222
8.4.2Convection and radiation225
8.4.3Combined conduction, convection and radiation228
8.4.4Passive fire protection231
8.4.5Alternative modelling of PFP233
8.4.6Finite element formulation234
8.4.7Internal energy exchange235
8.4.8Structural modelling237
8.4.9Examples of heat transfer analyses237
8.5Material properties at elevated temperatures240
8.5.1Stress-strain relationship240
8.5.2Creep242
8.5.3Thermal elongation243
8.6Modelling for nonlinear analysis243
8.6.1Material243
8.6.2Equivalent out-of-straightness concept245
8.6.3Compactness requirements246
8.6.4Deformation criteria246
8.6.4.1Tensile fracture247
8.6.4.2Capacity of connections247
8.6.4.3Member removal248
8.7Mechanical response analysis--effect of thermal expansion248
8.7.1Statistically determinate systems248
8.7.2Statistically indeterminate systems249
8.8Analysis procedures252
8.8.1Temperature domain252
8.8.2Temperature-load domain253
8.93D frame test256
8.9.1Instrumentation259
8.9.2Test execution260
8.9.3Test results261
8.9.4Temperature analysis with line source model266
8.9.4.1Structure modelling266
8.9.4.2Fire modelling266
8.9.5Comparisons of calculated and measured temperatures268
8.9.6Verification of mechanical response analysis272
8.9.6.1Structure modelling272
8.9.6.2Material modelling272
8.9.6.3Temperature load modelling273
8.9.6.4Load and temperature application273
8.9.6.5Comparison of mechanical response (measured temperatures)274
8.9.6.6Comparison of mechanical response (calculated temperatures)279
8.9.7Discussion279
References281
9Dynamic effects283
9.1Introduction283
9.2Characterisation of structural behaviour284
9.3Single-degree-of-freedom analysis287
9.4Dynamic analysis of jacket and jack-up289
9.5Suggested procedure295
References295
10Probabilistic collapse analysis297
10.1Introduction297
10.2Probabilistic modelling of overload failure298
10.3Description of platforms299
10.4Structural capacity versus base shear force300
10.4.1Uncertainty in wave load calculation models301
10.5Probabilistic vs. deterministic modelling of structural capacity303
10.5.1System capacity distribution304
10.5.2Annual maximum base-shear distribution307
10.5.2.1Environmental model307
10.5.2.2Base shear load distribution309
10.5.3Probability of collapse310
10.6Probabilistic modelling of wave force needed312
10.7Conclusions314
References315
Index317

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