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Formulation of the quantitative influence of local and overall initial deflections on load-bearing capacity of unstiffened welded square box section columns under axial compression


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Title: Formulation of the quantitative influence of local and overall initial deflections on load-bearing capacity of unstiffened welded square box section columns under axial compression
Authors: Chen, Xiang / Nakamura, Shozo / Okumatsu, Toshihiro / Nishikawa, Takafumi
Issue Date: 20-Dec-2019
Publisher: Elsevier Ltd.
Citation: Thin-Walled Structures, 147, art.no.106539; 2020
Abstract: Although it is well known that initial deflections have a significant influence on load-bearing capacity of unstiffened square box section columns under axial compression, their quantitative influence is not clear. In this study, 378 finite element models were analyzed to reveal the quantitative influence of local and overall initial deflections on load-bearing capacity. In the parametric analyses, nine combinations of the amplitude of the local and overall initial deflections were considered. In addition, normalized width-thickness and slenderness ratios were varied with ranges from 0.3 to 1.8 and from 0.3 to 1.5, respectively. As a result, the initial deflection influence coefficient was proposed to describe the quantitative influence on load-bearing capacity and formulated as functions of the local and overall initial deflections, normalized width-thickness and slenderness ratios. The accuracy of the proposed formula was verified through the comparison with the FEA results including additional 108 FEA results with normalized slenderness ratio of 0.9 and 1.2.
Keywords: Axial compression / Coupled buckling / Initial deflection / sLoad-bearing capacity / Parametric formulae / Unstiffened square welded box section
URI: http://hdl.handle.net/10069/39670
ISSN: 02638231
DOI: 10.1016/j.tws.2019.106539
Rights: © 2019 Elsevier Ltd. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Type: Journal Article
Text Version: author
Appears in Collections:Articles in academic journal

Citable URI : http://hdl.handle.net/10069/39670

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