Post-buckling behavior of thin-walled regular polygonal tubular columns undergoing local-distortional interaction

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 of an ongoing investigation concerning the elastic post-buckling behavior and imperfection sensitivity of regular convex polygonal cross-section (RCPS) tubular columns affected by local-distortional (L-D) interaction. This investigation is conducted by means of geometrically non-linear Generalized Beam Theory (GBT) analyses, extending the knowledge on the “pure” local and distortional post-buckling behaviors of RCPS tubes recently reported by the authors (Martins et al. 2018a). Due to their inherent modal nature, the GBT analyses make it possible to acquire in-depth knowledge on the structural behavior of RCPS tubes and also to include, in a straightforward fashion, arbitrary member initial geometrical imperfections. Columns with distortional-to-local critical buckling load ratios (i) close to 1 (“true L-D interaction” - the most trivial L-D interaction type) and (ii) significantly above 1 (“secondary-distortional bifurcation L-D interaction” - the most relevant L-D interaction type) are investigated. Local/distortional critical-mode initial geometrical imperfections and (linear) combinations of both are considered in the former columns, while only local initial imperfections are dealt with in the latter ones several amplitudes are dealt with to assess the imperfection sensitivity. For comparison and validation purposes, ABAQUS shell finite element analysis results are also reported.

Original languageEnglish
Title of host publicationStructural Stability Research Council Annual Stability Conference 2019, SSRC 2019
PublisherStructural Stability Research Council (SSRC)
Pages756-781
Number of pages26
Volume2
ISBN (Electronic)9781510884465
Publication statusPublished - 1 Jan 2019
EventStructural Stability Research Council Annual Stability Conference 2019, SSRC 2019 - St. Louis, United States
Duration: 2 Apr 20195 Apr 2019

Conference

ConferenceStructural Stability Research Council Annual Stability Conference 2019, SSRC 2019
CountryUnited States
CitySt. Louis
Period2/04/195/04/19

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