Transformed Calculation Models in Practice of Dynamic Analysis of Fixed Offshore Platform Structures
In this study, an attempt is made to study the nature of changes in the characteristics of the stress-strain state (SSS) of a fixed offshore platform structure under the influence of seismic loads. The structure is installed on a truss-type support base and is fixed in operating position by steel tu...
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| Format: | Article |
| Language: | English |
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Peoples’ Friendship University of Russia (RUDN University)
2024-12-01
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| Series: | Structural Mechanics of Engineering Constructions and Buildings |
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| Online Access: | https://journals.rudn.ru/structural-mechanics/article/viewFile/42702/24461 |
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| author | Valerii I. Sutyrin Elvira R. Kuzhakhmetova |
| author_facet | Valerii I. Sutyrin Elvira R. Kuzhakhmetova |
| author_sort | Valerii I. Sutyrin |
| collection | DOAJ |
| description | In this study, an attempt is made to study the nature of changes in the characteristics of the stress-strain state (SSS) of a fixed offshore platform structure under the influence of seismic loads. The structure is installed on a truss-type support base and is fixed in operating position by steel tubular piles driven into the soil base through support columns (deep foundation). A combined 3D finite element model “Superstructure - Pile Foundation - Soil Base” was used as the research tool. The purpose of the study was to develop a methodology for analyzing the dynamics of a fixed offshore platform as a 3D mechanical model, the finite element model of which is characterized by a large number of degrees of freedom. The efficiency of the numerical analysis of the system is increased by constructing a transformed calculation model (TCM). The transformation involves the transition to contour and calculation super nodes located along the axis of symmetry of the foundation pile. Contour nodes are used to connect the Substructure of super nodes to the Superstructure. The calculation nodes allow to take into account the vibrations of the pile foundation in the soil base. An algebraic computational procedure is proposed that allows the formation of matrices of generalized stiffness and mass coefficients. Modal analysis using a transformed calculation model (TCM) provides a significant reduction in the order and total computational time of the mechanical system. The possibility of analyzing dynamic reactions by a direct method based on the accelerogram of a real earthquake is provided. |
| format | Article |
| id | doaj-art-d4a7790c5dc64be787777358ded379df |
| institution | Kabale University |
| issn | 1815-5235 2587-8700 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Peoples’ Friendship University of Russia (RUDN University) |
| record_format | Article |
| series | Structural Mechanics of Engineering Constructions and Buildings |
| spelling | doaj-art-d4a7790c5dc64be787777358ded379df2025-02-04T07:23:34ZengPeoples’ Friendship University of Russia (RUDN University)Structural Mechanics of Engineering Constructions and Buildings1815-52352587-87002024-12-0120545347810.22363/1815-5235-2024-20-5-453-47821055Transformed Calculation Models in Practice of Dynamic Analysis of Fixed Offshore Platform StructuresValerii I. Sutyrin0https://orcid.org/0000-0002-4911-8515Elvira R. Kuzhakhmetova1https://orcid.org/0000-0002-0907-786XImmanuel Kant Baltic Federal UniversityKTB Beton GroupIn this study, an attempt is made to study the nature of changes in the characteristics of the stress-strain state (SSS) of a fixed offshore platform structure under the influence of seismic loads. The structure is installed on a truss-type support base and is fixed in operating position by steel tubular piles driven into the soil base through support columns (deep foundation). A combined 3D finite element model “Superstructure - Pile Foundation - Soil Base” was used as the research tool. The purpose of the study was to develop a methodology for analyzing the dynamics of a fixed offshore platform as a 3D mechanical model, the finite element model of which is characterized by a large number of degrees of freedom. The efficiency of the numerical analysis of the system is increased by constructing a transformed calculation model (TCM). The transformation involves the transition to contour and calculation super nodes located along the axis of symmetry of the foundation pile. Contour nodes are used to connect the Substructure of super nodes to the Superstructure. The calculation nodes allow to take into account the vibrations of the pile foundation in the soil base. An algebraic computational procedure is proposed that allows the formation of matrices of generalized stiffness and mass coefficients. Modal analysis using a transformed calculation model (TCM) provides a significant reduction in the order and total computational time of the mechanical system. The possibility of analyzing dynamic reactions by a direct method based on the accelerogram of a real earthquake is provided.https://journals.rudn.ru/structural-mechanics/article/viewFile/42702/24461pilepile foundationsystem analysissuperelementsdynamics of structuresvibrationsearthquakeseismicsfinite element methodsuperstructure - pile foundation - soil base |
| spellingShingle | Valerii I. Sutyrin Elvira R. Kuzhakhmetova Transformed Calculation Models in Practice of Dynamic Analysis of Fixed Offshore Platform Structures Structural Mechanics of Engineering Constructions and Buildings pile pile foundation system analysis superelements dynamics of structures vibrations earthquake seismics finite element method superstructure - pile foundation - soil base |
| title | Transformed Calculation Models in Practice of Dynamic Analysis of Fixed Offshore Platform Structures |
| title_full | Transformed Calculation Models in Practice of Dynamic Analysis of Fixed Offshore Platform Structures |
| title_fullStr | Transformed Calculation Models in Practice of Dynamic Analysis of Fixed Offshore Platform Structures |
| title_full_unstemmed | Transformed Calculation Models in Practice of Dynamic Analysis of Fixed Offshore Platform Structures |
| title_short | Transformed Calculation Models in Practice of Dynamic Analysis of Fixed Offshore Platform Structures |
| title_sort | transformed calculation models in practice of dynamic analysis of fixed offshore platform structures |
| topic | pile pile foundation system analysis superelements dynamics of structures vibrations earthquake seismics finite element method superstructure - pile foundation - soil base |
| url | https://journals.rudn.ru/structural-mechanics/article/viewFile/42702/24461 |
| work_keys_str_mv | AT valeriiisutyrin transformedcalculationmodelsinpracticeofdynamicanalysisoffixedoffshoreplatformstructures AT elvirarkuzhakhmetova transformedcalculationmodelsinpracticeofdynamicanalysisoffixedoffshoreplatformstructures |