Post-buckling behavior of thin-walled regular polygonal tubes subjected to bending

André D. Martins, Rodrigo Gonçalves, Dinar Camotim

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

This work presents and discusses numerical results concerning the elastic post-buckling behavior and imperfection sensitivity of regular convex polygonal cross-section (RCPS) tubular beams buckling in local, distortional and mixed local-distortional modes, a topic currently lacking research. This study is carried out in the framework of Generalized Beam Theory (GBT) geometrically non-linear analyses, enriched with a branch switching technique, and takes advantage of the GBT intrinsic modal nature to shed new light on the mechanics underlying the post-buckling behavior of these members. Due to the small half-wavelength of all the buckling phenomena addressed, only simply supported members under uniform bending are investigated. In particular, this work investigates the post-buckling behavior and imperfection sensitivity of RCPS beams (i) exhibiting several wall numbers (6,8,10,14,20,30) with distinct combinations of circumradius-to-thickness ratios (ii) having distinct lengths, and (iii) containing critical-mode initial geometrical imperfections with several amplitudes. Relevant displacement profiles and modal participation diagrams are provided along trivial and non-trivial equilibrium paths, in order to draw meaningful conclusions concerning the post-buckling behavior of RCPS tubes under bending. For comparison and validation purposes, ABAQUS shell finite element results are also presented.
Original languageEnglish
Title of host publicationProceedings of the Annual Stability Conference Structural Stability Research Council 2021, SSRC 2021
PublisherStructural Stability Research Council (SSRC)
ISBN (Print)9781713830474
Publication statusPublished - 2021
EventAnnual Stability Conference Structural Stability Research Council 2021, SSRC 2021 - Louisville, United States
Duration: 13 Apr 202116 Apr 2021

Conference

ConferenceAnnual Stability Conference Structural Stability Research Council 2021, SSRC 2021
Country/TerritoryUnited States
CityLouisville
Period13/04/2116/04/21

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