Adaptive meta-heuristic to predict dent depth damage in the fixed offshore structures

Punurai, Wonsiri; Azad, Samdani; Pholdee, Nantiwat; Sinsabvarodom, Chana

doi:10.1201/9781351174664-145

Cited by 3 publications

(5 citation statements)

References 5 publications

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“…The jacket platform used in this study has been designed for shallow water depth of approximately 65.53 meters [20]. The configuration of the steel jacket platform consists of a 4-legged structure with containing pile inside.…”

Section: Structural Model Descriptionsmentioning

confidence: 99%

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Effects of Redundancy in Bracing Systems on the Fragility Curve Development of Steel Jacket Offshore Platform

Azad¹,

Punurai²,

Sinsabvarodom³

et al. 2019

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Steel jacket offshore platforms are typically employed for use in shallow to moderate water depths. During platform operations, there have been some historical accidents completely damaging the diagonal members of the bracing systems due to explosions, fire accidents and dropped objects. Different locations of damaged bracings demonstrate different levels of risk for safety and integrity of the structures. This research illustrates the effects of redundancy in the bracing systems for steel jacket offshore platforms. Assessments have been carried out using the nonlinear pushover analysis method and formations of nonlinear hinges of different members were noted. Redundancy in different positions has been considered to investigate the consequences. Reserve strength ratio (RSR) and damage strength ratio (DSR) of the global structure were also evaluated to understand the importance of different local members. From the collapse data of local failures, fragility curves for the global structures were estimated. The results demonstrated that the position of damage can be a great concern which affects the overall performance of the structures.

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Section: Structural Model Descriptionsmentioning

confidence: 99%

“…An approximation in estimating fragility curves has been reported in this study. The jacket platform has been adopted from Punurai et al [20]. Pushover analyses are conducted for different redundant conditions to observe the force-displacement behavior following the procedure of El-din and Kim [5].…”

Section: Introductionmentioning

confidence: 99%

Effects of Redundancy in Bracing Systems on the Fragility Curve Development of Steel Jacket Offshore Platform

Azad¹,

Punurai²,

Sinsabvarodom³

et al. 2019

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“…Offshore jacket platforms for oil and gas operation are deployed to conduct the adaptive metaheuristic analysis. It is adopted from Punurai et al for this study. Dynamic analyses of the offshore structures are performed by using the FEM.…”

Section: Offshore Structural Model Descriptionmentioning

confidence: 99%

A novel hybridized metaheuristic technique in enhancing the diagnosis of cross‐sectional dent damaged offshore platform members

Punurai

Azad

Pholdee

et al. 2019

Computational Intelligence

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Offshore jacket platforms are widely used for oil and gas extraction as well as transportation in shallow to moderate water depth. Tubular cross‐sectional elements are used to construct offshore platforms. Tubular cross sections impart higher resistance against hydrodynamic forces and have high torsional rigidity. During operation, the members can be partially or fully damaged due to lateral impacts. The lateral impacts can be due to ship collisions or through the impact of falling objects. The impact forces can weaken some members that influence the overall performance of the platform. This demonstrates an urgent need to develop a framework that can accurately forecast dent depth as well as dent angle of the affected members. This study investigates the use of an adaptive metaheuristics algorithm to provide automatic detection of denting damage in an offshore structure. The damage information includes dent depth and the dent angle. A model is developed in combination with the percentage of the dent depth of the damaged member and is used to assess the performance of the method. It demonstrates that small changes in stiffness of individual damaged bracing members are detectable from measurements of global structural motion.

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“…The jacket platform is taken from [16]. At the bottom level, it was provided as K-bracings to impart more stiffness and reduce buckling.…”

Section: Structural Modelmentioning

confidence: 99%

“…1. Member properties of the jacket are also taken from [16]. The top mass of the oil and gas platform is simplified as a lumped…”

Section: Structural Modelmentioning

confidence: 99%

A Novel Application of System Survival Signature in Reliability Assessment of Offshore Structures

Regenhardt

Azad

Punurai

et al. 2018

Advances in Intelligent Systems and Computing

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Offshore platforms are large structures consisting of a large number of components of various types. Thus a variety of methods are usually necessary to assess the structural reliability of these structures, ranging from Finite-Elements-methods to Monte-Carlo-Simulations. However, often reliability information is only available for the members and not for the overall, complex, system. The recently introduced survival signature provides a way to separate the structural analysis from the behaviour of the individual members. Thus it is then possible to use structural reliability methods to obtain information about how the failure of several constituent members of the offshore platform leads to overall system failure. This way it is possible to separate the structural from time-dependent information, allowing flexible and computationally efficient computation of reliability predictions.

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Adaptive meta-heuristic to predict dent depth damage in the fixed offshore structures

Cited by 3 publications

References 5 publications

Effects of Redundancy in Bracing Systems on the Fragility Curve Development of Steel Jacket Offshore Platform

Effects of Redundancy in Bracing Systems on the Fragility Curve Development of Steel Jacket Offshore Platform

A novel hybridized metaheuristic technique in enhancing the diagnosis of cross‐sectional dent damaged offshore platform members

A Novel Application of System Survival Signature in Reliability Assessment of Offshore Structures

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