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Guedes C Soares – One of the best experts on this subject based on the ideXlab platform.

  • system reliability analysis of a stiffened panel under combined uniaxial compression and lateral pressure loads
    Structural Safety, 2012
    Co-Authors: B Gaspar, Arvid Naess, Bernt J. Leira, Guedes C Soares

    Abstract:

    A system reliability analysis of an oil tanker bottom component which consists of a stiffened panel under combined uniaxial compression and lateral sea pressure loads is presented in this paper. The stiffened panel is idealized as a structural system composed by several stiffeners with Attached Plating in parallel. The structural capacity of each stiffener with Attached Plating or system component is described by a nonlinear finite element model, considering as failure criterion the buckling collapse under the combined uniaxial compression and lateral sea pressure loads. These load components are defined considering a typical seagoing operational condition of the oil tanker in ballast load. The uncertainty in the relevant design basic variables is quantified using stochastic models proposed in the literature. To efficiently solve the structural system reliability problem a Monte Carlo based reliability estimation method recently proposed is combined with a response surface method. The combination of these two methods has been shown to be an efficient technique to solve structural system reliability problems that involve computationally demanding numerical models to describe the structural capacity of the system components. Annual probabilities of buckling collapse failure of the stiffened panel are estimated using this solution technique. The effect of corrosion on the stiffened panel reliability is quantified. The importance of considering the lateral sea pressure and correlation between the local and global wave-induced loads in the reliability problem are evaluated.

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B Gaspar – One of the best experts on this subject based on the ideXlab platform.

  • system reliability analysis of a stiffened panel under combined uniaxial compression and lateral pressure loads
    Structural Safety, 2012
    Co-Authors: B Gaspar, Arvid Naess, Bernt J. Leira, Guedes C Soares

    Abstract:

    A system reliability analysis of an oil tanker bottom component which consists of a stiffened panel under combined uniaxial compression and lateral sea pressure loads is presented in this paper. The stiffened panel is idealized as a structural system composed by several stiffeners with Attached Plating in parallel. The structural capacity of each stiffener with Attached Plating or system component is described by a nonlinear finite element model, considering as failure criterion the buckling collapse under the combined uniaxial compression and lateral sea pressure loads. These load components are defined considering a typical seagoing operational condition of the oil tanker in ballast load. The uncertainty in the relevant design basic variables is quantified using stochastic models proposed in the literature. To efficiently solve the structural system reliability problem a Monte Carlo based reliability estimation method recently proposed is combined with a response surface method. The combination of these two methods has been shown to be an efficient technique to solve structural system reliability problems that involve computationally demanding numerical models to describe the structural capacity of the system components. Annual probabilities of buckling collapse failure of the stiffened panel are estimated using this solution technique. The effect of corrosion on the stiffened panel reliability is quantified. The importance of considering the lateral sea pressure and correlation between the local and global wave-induced loads in the reliability problem are evaluated.

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  • Assessment of IACS-CSR implicit safety levels for buckling strength of stiffened panels for double hull tankers
    Marine Structures, 2011
    Co-Authors: B Gaspar, A.p. Teixeira, C. Guedes Soares, Ge Wang

    Abstract:

    Abstract The present study aims at applying structural reliability methods to assess the implicit safety levels of the buckling strength requirements for longitudinal stiffened panels implemented in the IACS Common Structural Rules (CSR) for double hull oil tankers. The buckling strength requirements considered are used in the initial stage of the hull girder scantlings’ design to control the buckling capacity of longitudinal stiffened panels subjected to the compressive loads induced by the hull girder vertical bending. The following buckling collapse failure modes are explicitly considered in the design formulation: uniaxial buckling of the Plating between stiffeners, column buckling of stiffeners with Attached Plating and lateral-torsional buckling or tripping of stiffeners. The paper presents the procedure used to assess the implicit safety levels of the strength requirements for the three buckling collapse failure modes above mentioned, which includes the optimization of the scantlings of the plate panels and longitudinal stiffeners in order to reflect the minimum strength required by the formulation. A first order reliability formulation is adopted, and stochastic models proposed in the literature are used to quantify the uncertainty in the relevant design variables. A sample of five oil tankers representative of the range of application of the IACS-CSR design rules is considered. The effect of corrosion in the implicit safety levels is quantified based on the three corrosion levels of the Net Thickness Approach (NTA) adopted in the design rules. Sensitivity analyses are also performed to quantify the relative contribution or importance of each design random variable to the implicit safety levels.

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Arvid Naess – One of the best experts on this subject based on the ideXlab platform.

  • system reliability analysis of a stiffened panel under combined uniaxial compression and lateral pressure loads
    Structural Safety, 2012
    Co-Authors: B Gaspar, Arvid Naess, Bernt J. Leira, Guedes C Soares

    Abstract:

    A system reliability analysis of an oil tanker bottom component which consists of a stiffened panel under combined uniaxial compression and lateral sea pressure loads is presented in this paper. The stiffened panel is idealized as a structural system composed by several stiffeners with Attached Plating in parallel. The structural capacity of each stiffener with Attached Plating or system component is described by a nonlinear finite element model, considering as failure criterion the buckling collapse under the combined uniaxial compression and lateral sea pressure loads. These load components are defined considering a typical seagoing operational condition of the oil tanker in ballast load. The uncertainty in the relevant design basic variables is quantified using stochastic models proposed in the literature. To efficiently solve the structural system reliability problem a Monte Carlo based reliability estimation method recently proposed is combined with a response surface method. The combination of these two methods has been shown to be an efficient technique to solve structural system reliability problems that involve computationally demanding numerical models to describe the structural capacity of the system components. Annual probabilities of buckling collapse failure of the stiffened panel are estimated using this solution technique. The effect of corrosion on the stiffened panel reliability is quantified. The importance of considering the lateral sea pressure and correlation between the local and global wave-induced loads in the reliability problem are evaluated.

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