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 language | English |
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Title of host publication | Proceedings of the Annual Stability Conference Structural Stability Research Council 2021, SSRC 2021 |
Publisher | Structural Stability Research Council (SSRC) |
ISBN (Print) | 9781713830474 |
Publication status | Published - 2021 |
Event | Annual Stability Conference Structural Stability Research Council 2021, SSRC 2021 - Louisville, United States Duration: 13 Apr 2021 → 16 Apr 2021 |
Conference
Conference | Annual Stability Conference Structural Stability Research Council 2021, SSRC 2021 |
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Country/Territory | United States |
City | Louisville |
Period | 13/04/21 → 16/04/21 |