Dynamic multi-patch isogeometric analysis of planar Euler–Bernoulli beams

Duy Vo, Aleksandar Borković, Pruettha Nanakorn, Tinh Quoc Bui*

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

This study presents a novel isogeometric Euler–Bernoulli beam formulation for in-plane dynamic analysis of multi-patch beam structures. The kinematic descriptions involve only displacements of the beam axis, which are approximated by non-uniform rational B-spline (NURBS) curves. Translational displacements of the control points are here considered as control variables. The motivation of this work is to propose a penalty-free method to handle in-plane dynamic analysis of multi-patch beam structures. A simple relation between cross-sectional rotations at the ends of the beams and control variables is derived, allowing the incorporation of the end rotations as degrees of freedom. This improved setting can straightforwardly tackle beam structures with many rigid multi-patch connections, a major challenging issue when using existing isogeometric Euler–Bernoulli beam formulations. Additionally, rotational boundary conditions are conveniently prescribed. Numerical examples with complicated beam structures such as circular arches and frames with kinks are considered to show the accuracy and performance of the developed formulation. The computed results are verified with those derived from the conventional finite element method, and the superior convergence properties of the proposed formulation are illustrated. A possible extension of the present approach to spatial beam structures is discussed.

Original languageEnglish
Article number113435
JournalComputer Methods in Applied Mechanics and Engineering
Volume372
DOIs
Publication statusPublished - 1 Dec 2020

Keywords

  • Circular arches
  • Frames with kinks
  • Isogeometric analysis (IGA)
  • Linear dynamic analysis
  • Multi-patch beam structures
  • Superior order of convergence

ASJC Scopus subject areas

  • Computational Mechanics
  • Mechanics of Materials
  • Mechanical Engineering
  • Physics and Astronomy(all)
  • Computer Science Applications

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