Column stability during welding
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Date
2019-02-24
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Mark
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IOP Publishing Ltd.
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Abstract
This research is part of the project of strengthening of steel members under load using
plates welded parallel to the member axis. Buckling load resistance of columns has to be checked
during welding under compressive load. A part of a cross-section is ineffective due to high
temperature near the weld. The centre of gravity is shifted and the decisive cross-section is
loaded by additional bending moment. Moreover, the weld causes deformations which are higher
than in case of regular welding. This paper presents authors’ method determining the buckling
load resistance of the compressed member during welding. The method takes into account the
column cross-section, slenderness, and effective intensity of the welding heat source. The
column is treated as a stepped member and its Euler’s critical load is decreased. The deformation
of the column and the stress are determined with regards to second order effects. The method is
validated by experiments performed in the laboratory of Department of Metal and Timber
Structures at Brno University of Technology in November 2017. Columns with cross-sections
HEA 100 and SHS 100×5 with the length of 3 m were loaded by the maximal force determined
using the analytical method and under this constant load the weld bead was being laid from the
bottom of the column to 15 cm above the mid-height. Then, still during welding, the force was
gradually increased until the column failed via flexural buckling. Measured values of load
resistance, deformations and temperatures are compared with the authors’ analytical method. All
six specimens resisted the maximum calculated load and failed at slightly higher loads.
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Citation
IOP Conference Series: Materials Science and Engineering. 2019, vol. 471, issue 2019, p. 1-7.
https://iopscience.iop.org/article/10.1088/1757-899X/471/5/052019
https://iopscience.iop.org/article/10.1088/1757-899X/471/5/052019
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Peer-reviewed
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en
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Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported
http://creativecommons.org/licenses/by-nc-sa/3.0/
http://creativecommons.org/licenses/by-nc-sa/3.0/