Development of a Simplified Beam Model for Tubular Joints in Jacket Structures

A. Sindoni, A. Sadeqi, J. H. Nielsen, E. Katsanos

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Abstract

Jacket structures are extensively used to support heavy-weight offshore infrastructure systems. Hence, reliable simulations and designs are vital to facilitate the safe extraction of offshore energy sources, accommodating the gradual transition to green energies. The tubular members of a typical jacket structure, i.e., braces and chords, are usually simulated by either shell or beam elements. However, the latter typically disregard local flexibility contributions at the point of connection that may lead to an overestimated stiffness of the joint. As reported in the literature, the local deformations in the beam models are not negligible, influencing both the static and dynamic performance of the joint and thereby the entire jacket structure. The present paper introduces a simplified method applying a standard beam element in order to account for the joint flexibility providing a low-dimensional finite element model for jacket structures. To this end, a differential evolution optimization algorithm is applied, considering modal parameters as the objective function. The procedure results in obtaining the geometrical and mechanical properties of the simplified beam element introduced herein to model the tubular joints. The investigation of several case studies with different joint types verifies the effectiveness and the application range of the introduced element in modal and static analyses.
Original languageEnglish
Title of host publicationCOMPDYN Proceedings
EditorsM. Papadrakakis, M. Fragiadakis
Volume1
PublisherNational Technical University of Athens
Publication date2023
Pages5120-5130
ISBN (Electronic)978-618-5827-01-4
Publication statusPublished - 2023
Event9th ECCOMAS Thematic Conference on Computational Methods in Structural Dynamics and Earthquake Engineering - Royal Olympic , Athens, Greece
Duration: 12 Jun 202314 Jun 2023

Conference

Conference9th ECCOMAS Thematic Conference on Computational Methods in Structural Dynamics and Earthquake Engineering
LocationRoyal Olympic
Country/TerritoryGreece
CityAthens
Period12/06/202314/06/2023
SeriesCompdyn Proceedings
ISSN2623-3347

Keywords

  • Differential Evolution
  • Finite Element Model
  • Jacket Structures
  • Joint Flexibility
  • Optimization
  • Tubular joint

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