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Coupled Systems Mechanics
  Volume 9, Number 5, October 2020, pages 433-454
DOI: http://dx.doi.org/10.12989/csm.2020.9.5.433
 


Structural performance assessment of fixed offshore platform based on in-place analysis
Shehata E. Abdel Raheem, Elsayed M. Abdel Aal, Aly G.A. AbdelShafy, Mahmoud H. Mansour and Mohamed Omar

 
Abstract
    In-place analysis for offshore platforms is essentially required to make proper design for new structures and true assessment for existing structures. The structural integrity of platform components under the maximum and minimum operating loads of environmental conditions is required for risk assessment and inspection plan development. In-place analyses have been executed to check that the structural member with all appurtenances robustness and capability to support the applied loads in either storm condition or operating condition. 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 analysis includes interpretation of dynamic design parameters based on the available site-specific data, together with foundation design recommendations for in-place loading conditions. 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 important effects on the results of the in-place analysis behavior. The result shows that the in-place analysis is quite crucial for safe design and operation of offshore platform and assessment for existing offshore structures.
 
Key Words
    FEM; offshore platform; storm condition; pile soil interaction; in-place analysis
 
Address
Shehata E. Abdel Raheem: Civil Engineering Department, Faculty of Engineering, Assuit University, Assiut 71516, Egypt
Elsayed M. Abdel Aal: Egypt Gas Company, Alexandria. Egypt
Aly G.A. AbdelShafy: Civil Engineering Department, Faculty of Engineering, Assuit University, Assiut 71516, Egypt
Mahmoud H. Mansour: Civil Engineering Department, Faculty of Engineering, Assuit University, Assiut 71516, Egypt
Mohamed Omar: Civil Engineering Department, Faculty of Engineering, Aswan University, Aswan, Egypt
 

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