Structural reliability of offshore platforms considering fatigue damage and different failure scenarios

Gholizad, Amin; Golafshani, Ali Akbar; Akrami, Vahid

doi:10.1016/j.oceaneng.2012.01.033

Cited by 24 publications

(7 citation statements)

References 7 publications

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“…Applications of the T-D SRA for the design of modern metal structures such as those deployed offshore (i.e., in environments characterized by highly stochastic loads and resistance properties, thus necessitating the need for SRA to account for such uncertainties systematically) include [2,3,44,[47][48][49][89][90][91][92][93][94]. In [95], the fatigue reliability of fixed offshore platforms was investigated by analyzing different failure scenarios. The analysis was divided into a finite number of sub-scenarios in order to evaluate the occurrence probability of a special scenario.…”

Section: Critical Discussionmentioning

confidence: 99%

A Systematic Review of Structural Reliability Methods for Deformation and Fatigue Analysis of Offshore Jacket Structures

Shittu

Kolios

Mehmanparast

2020

Metals

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This paper presents the state of the art in Structural Reliability Analysis (SRA) methods with a view of identifying key applications of each method and its proposed variations, qualifying characteristics, advantages, and limitations. Due to the increasing complexity and scale of modern offshore jacket structures, it becomes increasingly necessary to propose an accurate and efficient approach for the assessment of uncertainties in their material properties, geometric dimensions, and operating environments. SRA, as a form of uncertainty analysis, has been demonstrated to be a useful tool in the design of structures because it can directly quantify how uncertainty about input parameters can affect structural performance. Herein, attention was focused specifically on the probabilistic fracture mechanics approach because this accounts accurately for fatigue reliability mostly encountered as being dominant in the design of such structures. The well-established analytical/approximate methods such as the First- and Second-Order Reliability Methods (FORM/SORM) are widely used as they offer a good balance between accuracy and efficiency for realistic problems. They are, however, inaccurate in cases of highly non-linear systems. As a result, they have been modified using methods such as conjugate search direction approach, saddle point approximation, subset simulation, evidence theory, etc. in order to improve accuracy. Initially, direct simulations methods such as the Monte Carlo Simulation Method (MCS) with its various variance reduction techniques such as the Importance Sampling (IS), Latin Hypercube Sampling (LHS), etc. are ideal for structures having non-linear limit states but perform poorly for problems that calculate very low probabilities of failure. Overall, each method has its own merits and limitation, with FORM/SORM being the most commonly used, but recently, simulation methods have increasingly been used due to continuous advances in computation powers. Other relevant methods include the Response Surface Methods (RSM) and the Surrogate Models/Meta-models (SM/MM), which are advanced approximation methods and are ideal for structures with implicit limit state functions and high-reliability indices. Combinations of advanced approximation methods and reliability analysis methods are also found in literature as they can be suitable for complex, highly non-linear problems.

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Section: Critical Discussionmentioning

confidence: 99%

A Systematic Review of Structural Reliability Methods for Deformation and Fatigue Analysis of Offshore Jacket Structures

Shittu

Kolios

Mehmanparast

2020

Metals

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“…In other words, each member of the platform should be considered as a scenario and, with its failure, the load will be spread to other members, and the probability of failures of each member will change. Equation (1) calculates the failure probability of the entire system [58].…”

Section: Reliability and Failure Probabilitymentioning

confidence: 99%

A Comprehensive Review on Design, Monitoring, and Failure in Fixed Offshore Platforms

Amiri

Shaterabadi

Kashyzadeh

et al. 2021

JMSE

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Offshore platforms have had diverse applications in the marine industry, for example, oil or gas platforms can provide facilities to store the oil and gas before transport those to refineries. Offshore wind turbines are another well-known use of the offshore platform for generating power. As platforms encounter various strong forces from water and wind currents, the materials used for these structures are mainly steel or concrete. These platforms are classified into different types, according to the depth of water and their applications. In addition, offshore platforms, as artificial reefs may be used for decades at different marine conditions. Consequently, their design and maintenance are very important, otherwise, they can cause irreparable damage to the environment. This paper presents the latest and most significant design and monitoring methods, such as the optimal probabilistic seismic demand model, multi-objective optimization, dynamic response assessment, robust fault-tolerant control, etc., under different environmental and geographical conditions. Moreover, the effective factors on the life and failure of these offshore structures are comprehensively introduced to enhance awareness of them, which can be very helpful to improve the design and construction of more reliable and durable structures.

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“…For an OWT, this means that the OWT structure must fulfil its function reliably, and hence, must not become unsafe, in general, over 25 years [13]. Several studies [10,[14][15][16][17][18][19][20] have already applied the probabilistic-based structural reliability methods for the assessment of offshore structures. However, most studies assume that the system is time-invariant.…”

Section: Introductionmentioning

confidence: 99%

Comparative study between S-N and fracture mechanics approach on reliability assessment of offshore wind turbine jacket foundations

Shittu

Mehmanparast

Hart

et al. 2021

Reliability Engineering & System Safety

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Structural reliability of offshore platforms considering fatigue damage and different failure scenarios

Cited by 24 publications

References 7 publications

A Systematic Review of Structural Reliability Methods for Deformation and Fatigue Analysis of Offshore Jacket Structures

A Systematic Review of Structural Reliability Methods for Deformation and Fatigue Analysis of Offshore Jacket Structures

A Comprehensive Review on Design, Monitoring, and Failure in Fixed Offshore Platforms

Comparative study between S-N and fracture mechanics approach on reliability assessment of offshore wind turbine jacket foundations

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