The Experts below are selected from a list of 207 Experts worldwide ranked by ideXlab platform

Yosua Riskiyanto Palentek - One of the best experts on this subject based on the ideXlab platform.

  • study on buckling strength at deck leg of Fixed Offshore Platform
    International Journal of Engineering, 2016
    Co-Authors: Muhammad Zubair Muis Alie, Arga Aditya, Yosua Riskiyanto Palentek
    Abstract:

    A deck of Fixed Offshore Platform is location where the all activities are performed, i.e. deck must be supported by leg with adequately strength under vertical or horizontal loading. The present study is focused on the buckling strength taking the deck leg of Fixed jacket Offshore Platform into account. The axial compressive load is applied to the deck leg of the structure. Because dimension front view and side view of the deck structure is completely different, so that the analysis is conducted by two stages. To investigate the critical buckling load and critical buckling stress including its deformation, the plane-frame (2D) analysis is considered. The Non-linear Finite Element Method so-called Structural Analysis Program (SAP) is adopted for the investigation of the structural behaviors. The critical buckling load and stress ratio obtained by Finite Element Analysis (FEA) is compared with the simple formula. As a result, it can be concluded that the stress ratio of the combination between axial compression and bending is less than 1,0 which indicates that the structure is safe.

  • the effect of d t ratio on buckling strength analysis of Fixed Offshore Platform
    International Journal of Engineering, 2016
    Co-Authors: Muhammad Zubair Muis Alie, Daud Geris Sesa, Yosua Riskiyanto Palentek
    Abstract:

    A jacket, or template, structures are still the most common Offshore structures used for drilling and production. Fixed jacket structures consist of tubular members interconnected to form a threedimensional space frame. Hence, the jacket structure can be categorized into a column structure. The D/t ratio of a typical member on the jacket structure has significant influence to buckling strength. Although only the axial load acts on the jacket legs, the local and global deformation of the structural member due to this load must be taken into account. This paper discusses the effect of D/t ratio on Fixed jacket Platform in the buckling strength analysis. A kind of Fixed jacket Offshore structure namely tripod is taken as the object of the analysis. Only the axial load is considered and it is applied to all jacket legs. The material and dimension of the structure are taken based on the structural member. Crack and corrosion are not considered in the analysis. To assess the buckling strength of the structure due to the effect of D/t ratio, the Finite Element Method (FEM) is performed. As a fundamental case, the buckling strength analysis is conducted on the structure by taking two dimensional planes (2D) into consideration to obtain the critical buckling load due to the effect of D/t ratio for two dimensional plane. The result obtained by FEA is compared with the analytical solution.

  • Buckling Analysis on Pechiko Field of Fixed Offshore Platform in Makassar Strait
    Applied Mechanics and Materials, 2015
    Co-Authors: Muhammad Zubair Muis Alie, Yosua Riskiyanto Palentek, Daud Geris Sesa
    Abstract:

    One of the most important criterion in the design of Fixed Offshore Platform is to have strength from applied loads which is acting perpendicular to jacket leg section such as axial compression.The axial compressive load acts vertically downward to jacket legs and the deformation on the jacket legs in horizontal direction due to this load is called buckling. In the present study, buckling analysis on pechiko field of Fixed Offshore Platform is performed using Finite Element Analysis (FEA). The Fixed jacket Platform namely tripod and tetrapod are taken as the object of the analysis. Only the axial compressive load is used in the analysis and the boundary conditions are assumed to be Fixed both tripod and tetrapod at the bottom seabed. As a fundamental case, buckling analysis is carried out in plane-section (2D analysis), then the result obtained by FE analysis is compared with the analytical solution.It is found that the result obtained by FE analysis for the critical buckling load is in good agreement with the analytical solution, and the applicability of FE analysis is further used to investigate the deformation of 3D model.

Muhammad Zubair Muis Alie - One of the best experts on this subject based on the ideXlab platform.

  • study on buckling strength at deck leg of Fixed Offshore Platform
    International Journal of Engineering, 2016
    Co-Authors: Muhammad Zubair Muis Alie, Arga Aditya, Yosua Riskiyanto Palentek
    Abstract:

    A deck of Fixed Offshore Platform is location where the all activities are performed, i.e. deck must be supported by leg with adequately strength under vertical or horizontal loading. The present study is focused on the buckling strength taking the deck leg of Fixed jacket Offshore Platform into account. The axial compressive load is applied to the deck leg of the structure. Because dimension front view and side view of the deck structure is completely different, so that the analysis is conducted by two stages. To investigate the critical buckling load and critical buckling stress including its deformation, the plane-frame (2D) analysis is considered. The Non-linear Finite Element Method so-called Structural Analysis Program (SAP) is adopted for the investigation of the structural behaviors. The critical buckling load and stress ratio obtained by Finite Element Analysis (FEA) is compared with the simple formula. As a result, it can be concluded that the stress ratio of the combination between axial compression and bending is less than 1,0 which indicates that the structure is safe.

  • the effect of d t ratio on buckling strength analysis of Fixed Offshore Platform
    International Journal of Engineering, 2016
    Co-Authors: Muhammad Zubair Muis Alie, Daud Geris Sesa, Yosua Riskiyanto Palentek
    Abstract:

    A jacket, or template, structures are still the most common Offshore structures used for drilling and production. Fixed jacket structures consist of tubular members interconnected to form a threedimensional space frame. Hence, the jacket structure can be categorized into a column structure. The D/t ratio of a typical member on the jacket structure has significant influence to buckling strength. Although only the axial load acts on the jacket legs, the local and global deformation of the structural member due to this load must be taken into account. This paper discusses the effect of D/t ratio on Fixed jacket Platform in the buckling strength analysis. A kind of Fixed jacket Offshore structure namely tripod is taken as the object of the analysis. Only the axial load is considered and it is applied to all jacket legs. The material and dimension of the structure are taken based on the structural member. Crack and corrosion are not considered in the analysis. To assess the buckling strength of the structure due to the effect of D/t ratio, the Finite Element Method (FEM) is performed. As a fundamental case, the buckling strength analysis is conducted on the structure by taking two dimensional planes (2D) into consideration to obtain the critical buckling load due to the effect of D/t ratio for two dimensional plane. The result obtained by FEA is compared with the analytical solution.

  • Buckling Analysis on Pechiko Field of Fixed Offshore Platform in Makassar Strait
    Applied Mechanics and Materials, 2015
    Co-Authors: Muhammad Zubair Muis Alie, Yosua Riskiyanto Palentek, Daud Geris Sesa
    Abstract:

    One of the most important criterion in the design of Fixed Offshore Platform is to have strength from applied loads which is acting perpendicular to jacket leg section such as axial compression.The axial compressive load acts vertically downward to jacket legs and the deformation on the jacket legs in horizontal direction due to this load is called buckling. In the present study, buckling analysis on pechiko field of Fixed Offshore Platform is performed using Finite Element Analysis (FEA). The Fixed jacket Platform namely tripod and tetrapod are taken as the object of the analysis. Only the axial compressive load is used in the analysis and the boundary conditions are assumed to be Fixed both tripod and tetrapod at the bottom seabed. As a fundamental case, buckling analysis is carried out in plane-section (2D analysis), then the result obtained by FE analysis is compared with the analytical solution.It is found that the result obtained by FE analysis for the critical buckling load is in good agreement with the analytical solution, and the applicability of FE analysis is further used to investigate the deformation of 3D model.

Daud Geris Sesa - One of the best experts on this subject based on the ideXlab platform.

  • the effect of d t ratio on buckling strength analysis of Fixed Offshore Platform
    International Journal of Engineering, 2016
    Co-Authors: Muhammad Zubair Muis Alie, Daud Geris Sesa, Yosua Riskiyanto Palentek
    Abstract:

    A jacket, or template, structures are still the most common Offshore structures used for drilling and production. Fixed jacket structures consist of tubular members interconnected to form a threedimensional space frame. Hence, the jacket structure can be categorized into a column structure. The D/t ratio of a typical member on the jacket structure has significant influence to buckling strength. Although only the axial load acts on the jacket legs, the local and global deformation of the structural member due to this load must be taken into account. This paper discusses the effect of D/t ratio on Fixed jacket Platform in the buckling strength analysis. A kind of Fixed jacket Offshore structure namely tripod is taken as the object of the analysis. Only the axial load is considered and it is applied to all jacket legs. The material and dimension of the structure are taken based on the structural member. Crack and corrosion are not considered in the analysis. To assess the buckling strength of the structure due to the effect of D/t ratio, the Finite Element Method (FEM) is performed. As a fundamental case, the buckling strength analysis is conducted on the structure by taking two dimensional planes (2D) into consideration to obtain the critical buckling load due to the effect of D/t ratio for two dimensional plane. The result obtained by FEA is compared with the analytical solution.

  • Buckling Analysis on Pechiko Field of Fixed Offshore Platform in Makassar Strait
    Applied Mechanics and Materials, 2015
    Co-Authors: Muhammad Zubair Muis Alie, Yosua Riskiyanto Palentek, Daud Geris Sesa
    Abstract:

    One of the most important criterion in the design of Fixed Offshore Platform is to have strength from applied loads which is acting perpendicular to jacket leg section such as axial compression.The axial compressive load acts vertically downward to jacket legs and the deformation on the jacket legs in horizontal direction due to this load is called buckling. In the present study, buckling analysis on pechiko field of Fixed Offshore Platform is performed using Finite Element Analysis (FEA). The Fixed jacket Platform namely tripod and tetrapod are taken as the object of the analysis. Only the axial compressive load is used in the analysis and the boundary conditions are assumed to be Fixed both tripod and tetrapod at the bottom seabed. As a fundamental case, buckling analysis is carried out in plane-section (2D analysis), then the result obtained by FE analysis is compared with the analytical solution.It is found that the result obtained by FE analysis for the critical buckling load is in good agreement with the analytical solution, and the applicability of FE analysis is further used to investigate the deformation of 3D model.

Shehata E. Abdel Raheem - One of the best experts on this subject based on the ideXlab platform.

  • Numerical analysis for structure-pile-fluid-soil interaction model of Fixed Offshore Platform
    Ocean systems engineering, 2020
    Co-Authors: Shehata E. Abdel Raheem, Elsayed M. Abdel Aal, Aly G.a. Abdelshafy, Mahmoud H. Mansour, Mohamed Omar
    Abstract:

    In-place analysis for Offshore Platforms is required to make proper design for new structures and true assessment for existing structures. In addition, ensure the structural integrity of Platforms components under the maximum and minimum operating loads and environmental conditions. In-place analysis was carried out to verify the robustness and capability of structural members with all appurtenances to support the applied loads in either operating condition or storm conditions. A nonlinear finite element analysis is adopted for the Platform structure above the seabed and the pile–soil interaction to estimate the in-place behavior of a typical Fixed Offshore Platform. The SACS software is utilized to calculate the natural frequencies of the model and to obtain the response of Platform joints according to in-place analysis then the stresses at selected members, as well as their nodal displacements. The directions of environmental loads and water depth variations have an important effect on the results of the in-place analysis behavior. The influence of the soil-structure interaction on the response of the jacket foundation predicts is necessary to estimate the loads of the Offshore Platform well and real simulation of Offshore foundation for the in-place analysis. The result of the study shows that the in-place response investigation is quite crucial for safe design and operation of Offshore Platform against the variation of environmental loads.

  • In-place analysis for design-level assessment of the Fixed Offshore Platform
    Ships and Offshore Structures, 2020
    Co-Authors: Shehata E. Abdel Raheem, Elsayed M. Abdel Aal, Mohamed Omar, Aly G. A. Abdel Shafy, Mohamed F.m. Fahmy, Mahmoud H. Mansour
    Abstract:

    The structural integrity of Platform components under operational loads and environmental storm conditions is required for risk assessment and inspection plan development. In-place analysis was per...

  • Nonlinear behaviour of steel Fixed Offshore Platform under environmental loads
    Ships and Offshore Structures, 2014
    Co-Authors: Shehata E. Abdel Raheem
    Abstract:

    The structural design requirements of an Offshore Platform subjected to wave-induced forces and moments in steel jacket can play a major role in the design of the Offshore structures. For an economic and reliable design, good estimation of wave loadings is essential. The wave-and-current forces acting on the structure are computed by using Morison's equation, which decomposes the total force into an inertia component and a drag component. A nonlinear response analysis of a Fixed Offshore Platform under wave loadings is presented; the structure is discretised using the finite element method. The dynamic response of the Fixed Offshore Platform together with the distribution of displacement, axial force, and bending moment along the leg are investigated under regular and extreme conditions, where the structure should keep production capability under 1 year return period design wave of operation conditions and must be able to survive under the 100 year return period storm conditions. The result of this study ...

K. S. Arun - One of the best experts on this subject based on the ideXlab platform.

  • Erratum to: Effect of seabed slope on the pile behaviour of a Fixed Offshore Platform under lateral forces
    Journal of Ocean Engineering and Marine Energy, 2015
    Co-Authors: Kasinathan Muthukkumaran, K. S. Arun
    Abstract:

    Fixed Offshore Platforms supported by pile foundations have to resist lateral loads due to wave and current forces. The response to environmental loads is strongly affected by the soil-structure (pile) interaction. Forces exerted by waves are the predominant lateral environmental forces governing jacket structure design, especially the foundation piles. The purpose of the present investigation is to perform a static wave analysis of a typical Fixed Offshore Platform in extreme environmental conditions and to study the effects of the combined lateral and vertical loads on pile group foundations. The three-dimensional modelling and analysis of the Offshore Platform are carried out using the finite difference method. The present analysis is done under static conditions considering the structural and environmental loads at extreme environmental conditions, reaching the state of static equilibrium. A parametric study is done by varying the seabed slope to examine the differences in the soil-structure interaction behaviour of piles. The lateral displacement at the pile top and at the seabed level increases with the seabed slope. Also the depth at which the maximum shear force and bending moment occur from the pile top increases with the seabed slope.

  • Effect of seabed slope on pile behaviour of Fixed Offshore Platform under lateral forces
    Journal of Ocean Engineering and Marine Energy, 2015
    Co-Authors: Kasinathan Muthukkumaran, K. S. Arun
    Abstract:

    Fixed Offshore Platforms supported by pile foundations are required to resist lateral load due to wave and current forces. The response to environmental loads is strongly affected by the soil structure (pile) interaction. The forces exerted by waves are most dominant among the lateral environmental forces which governing the jacket structures design especially the foundation piles. The present investigation is to perform a static wave analysis on a typical Fixed Offshore Platform for extreme environmental conditions, and to study the effects of the combined lateral and vertical loads on pile group foundation. The three dimensional modeling and analysis of the Offshore Platform are done using finite difference method. The present analysis was done under static condition considering the structural and the environmental loads at extreme environmental conditions, by reaching the state of static equilibrium. A parametric study has been done by varying the seabed slope to examine the variation in soil-structure interaction behaviour of piles. It has been found that the lateral displacement at the pile top and at the seabed level increases as the seabed slope increases. It is also noticed that the depth at which the maximum shear force and bending moment occurs from the pile top increases as the slope of the seabed increases.