Post-Buckling Behavior of Thin-Walled Regular Polygonal Tubular Columns Undergoing Local-Distortional Interaction
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.
This SSRC paper, available via the link below, is restricted to members only.
If you haven't already done so, please log in to your AISC member profile or review membership options at aisc.org/join.
- Date: 4/2/2019 - 4/5/2019
- PDH Credits: 0
Andre D. Martins and Dinar Camotim; Universidade de Lisboa; Lisbon, Portugal; Rodrigo Goncalves; Universidade Nova de Lisboa; Lisbon, Portugal