Attached Plating

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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, Bernt J. Leira, Arvid Naess, 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.

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, Bernt J. Leira, Arvid Naess, 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.

  • 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.

Bernt J. Leira - 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, Bernt J. Leira, Arvid Naess, 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.

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, Bernt J. Leira, Arvid Naess, 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.

Masahiko Fujikubo - One of the best experts on this subject based on the ideXlab platform.

  • progressive collapse analysis of a ship s hull girder under longitudinal bending considering local pressure loads
    Journal of the Society of Naval Architects of Japan, 2000
    Co-Authors: Masahiko Fujikubo, Mohammad Reza Khedmati
    Abstract:

    A method of progressive collapse analysis of a ship's hull girder under longitudinal bending developed by the first author is extended in order to take local pressure loads into account. First, the average stress-average strain relationship of the plate elements subjected to combined thrust and lateral pressure is formulated in an analytical manner. Then, based on the equilibrium conditions of forces and bending moments considering the influence of lateral pressure, the average stress-average strain relationship of stiffener elements with Attached Plating is derived. The proposed analytical procedure is then verified through the comparison of the calculated results with those by the FEM analysis for both plate and stiffener elements. Finally, developed formulations are implemented into the computer code “HULLST”, and the modified code is applied to the analysis of collapse behaviour and ultimate hull girder strength of MV “Energy Concentration.”

  • ISUM Rectangular Plate Element with New Lateral Shape Functions (2nd Report)
    Journal of the Society of Naval Architects of Japan, 2000
    Co-Authors: Masahiko Fujikubo, Patrick Kaeding
    Abstract:

    An ISUM rectangular plate element with new shape functions for its lateral deflection under longitudinal/transverse thrust has been developed in the 1st Report. In this report, the ISUM plate element is combined with beam-column elements to model stiffened plates, and its applicability is extended to biaxial thrust.The fundamental collapse behaviour of stiffened plates is investigated by FEM analyses. The ISUM approach is formulated considering the collapse characteristics. A new modelling technique to evaluate overall buckling of stiffeners with Attached Plating as well as local plate buckling is proposed. Results for longitudinal and biaxial thrust show the applicability and accuracy of this approach.

  • DEVELOPMENT AND APPLICATION OF SIMPLE PLATE MODEL TO SIMULATE COLLAPSE BEHAVIOUR UNDER THRUST
    Journal of the Society of Naval Architects of Japan, 1995
    Co-Authors: Tetsuya Yao, Masahiko Fujikubo, Chun Nie, Seiji Kamiyama
    Abstract:

    This paper deals with the development and application of a simple dynamical model which accurately simulate the buckling/plastic collapse behaviour of a plate subjected to cyclic inplane load accompanied by complex unloading and reloading. This model is based on the results of elastic large deflection analysis and rigid plastid mechanism analysis in analytical forms assuming a simple deflection mode. The proposed model is implemented into a beam-column element as one fibre to analyze the buckling/plastic collapse behaviour of a continuous stiffened Plating subjected to thrust. The beam-column element is composed of a stiffener and Attached Plating. The fibre representing the Plating is assumed to behave according to the proposed simple dynamical model. Applicabilities of the new plate model and the new beam-column element are demonstrated through comparison of the calculate results with those by the ordinary elastoplastic large deflection finite element analysis.