Details
| Original language | English |
|---|---|
| Pages (from-to) | 101-115 |
| Number of pages | 15 |
| Journal | Computers & structures |
| Volume | 154 |
| Early online date | 11 Apr 2015 |
| Publication status | Published - 1 Jul 2015 |
| Externally published | Yes |
Abstract
The design of an offshore structure is highly dependent on the operating environmental parameters, where a realistic statistical model of the latter is essential to produce a representative estimate of the performance and failure probability. Establishing an accurate model of the offshore environment can be a challenging task. The use of simple probabilistic models may lead to biased results in the stochastic structural analysis since the environmental impact to an existing offshore structure is associated with a wide range of inter-dependent factors. In this paper, the specification of long-term design loads for offshore structures considering multiple environmental factors is investigated where the dependency between several commonly used sea state parameters are instituted through a copula-based multivariate probabilistic model. Several copula functions, capable of modeling both linear and non-linear dependence structures, are considered. The developed multivariate model based on copula concept is compared with the available approaches in the literature using actual environmental data. The modeled sea state parameters are then utilized to characterize the sea load for the reliability analysis of a real jacket structure where the prediction of the long term load is derived in a discretized form. The applicability of this approach in a high dimensional multivariate problem is also discussed.
Keywords
- Copula model, Extreme value distribution, Jacket structures, Nonlinear dependencies, Reliability estimation, Significant wave height
ASJC Scopus subject areas
- Engineering(all)
- Civil and Structural Engineering
- Mathematics(all)
- Modelling and Simulation
- Materials Science(all)
- Engineering(all)
- Mechanical Engineering
- Computer Science(all)
- Computer Science Applications
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In: Computers & structures, Vol. 154, 01.07.2015, p. 101-115.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Long-term performance assessment and design of offshore structures
AU - Zhang, Yi
AU - Beer, Michael
AU - Quek, Ser Tong
PY - 2015/7/1
Y1 - 2015/7/1
N2 - The design of an offshore structure is highly dependent on the operating environmental parameters, where a realistic statistical model of the latter is essential to produce a representative estimate of the performance and failure probability. Establishing an accurate model of the offshore environment can be a challenging task. The use of simple probabilistic models may lead to biased results in the stochastic structural analysis since the environmental impact to an existing offshore structure is associated with a wide range of inter-dependent factors. In this paper, the specification of long-term design loads for offshore structures considering multiple environmental factors is investigated where the dependency between several commonly used sea state parameters are instituted through a copula-based multivariate probabilistic model. Several copula functions, capable of modeling both linear and non-linear dependence structures, are considered. The developed multivariate model based on copula concept is compared with the available approaches in the literature using actual environmental data. The modeled sea state parameters are then utilized to characterize the sea load for the reliability analysis of a real jacket structure where the prediction of the long term load is derived in a discretized form. The applicability of this approach in a high dimensional multivariate problem is also discussed.
AB - The design of an offshore structure is highly dependent on the operating environmental parameters, where a realistic statistical model of the latter is essential to produce a representative estimate of the performance and failure probability. Establishing an accurate model of the offshore environment can be a challenging task. The use of simple probabilistic models may lead to biased results in the stochastic structural analysis since the environmental impact to an existing offshore structure is associated with a wide range of inter-dependent factors. In this paper, the specification of long-term design loads for offshore structures considering multiple environmental factors is investigated where the dependency between several commonly used sea state parameters are instituted through a copula-based multivariate probabilistic model. Several copula functions, capable of modeling both linear and non-linear dependence structures, are considered. The developed multivariate model based on copula concept is compared with the available approaches in the literature using actual environmental data. The modeled sea state parameters are then utilized to characterize the sea load for the reliability analysis of a real jacket structure where the prediction of the long term load is derived in a discretized form. The applicability of this approach in a high dimensional multivariate problem is also discussed.
KW - Copula model
KW - Extreme value distribution
KW - Jacket structures
KW - Nonlinear dependencies
KW - Reliability estimation
KW - Significant wave height
UR - http://www.scopus.com/inward/record.url?scp=84927167294&partnerID=8YFLogxK
U2 - 10.1016/j.compstruc.2015.02.029
DO - 10.1016/j.compstruc.2015.02.029
M3 - Article
AN - SCOPUS:84927167294
VL - 154
SP - 101
EP - 115
JO - Computers & structures
JF - Computers & structures
SN - 0045-7949
ER -