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Modified moment connection between I‐beam and double‐I built‐up column

Modified moment connection between I‐beam and double‐I built‐up column Double‐I sections are widely used as columns in moment‐resisting frames. The conventional welded moment connection between I‐beam and double‐I built‐up column behaves in a partially restrained manner and does not provide the strength and ductility required in special moment frames. In this paper, a modification method is proposed to improve the behavioural characteristics of conventional moment connections. The modification involves replacing the continuous cover plate with two alternative plates having increased width and thickness at the location of the beam flange‐plates. The behaviour of the proposed connection was investigated in detail both experimentally, by means of two full‐scale specimens, and analytically, by means of eight finite element models. Based on the results obtained, in beams with a modified connection most of the plasticity develops remote from the column cover plate, and the panel zone remains in an elastic state. Accordingly, the deformation of the modified connection is reduced significantly and its stiffness is increased to the level required for a fully restrained connection. The hysteresis curves of the modified connection are also stable during large inelastic deformations with no substantial pinching. The modified connection provides the strength and ductility required in special moment frames. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Steel Construction: Design and Research Wiley

Modified moment connection between I‐beam and double‐I built‐up column

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Publisher
Wiley
Copyright
© 2022 Ernst & Sohn GmbH
ISSN
1867-0520
eISSN
1867-0539
DOI
10.1002/stco.202000037
Publisher site
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Abstract

Double‐I sections are widely used as columns in moment‐resisting frames. The conventional welded moment connection between I‐beam and double‐I built‐up column behaves in a partially restrained manner and does not provide the strength and ductility required in special moment frames. In this paper, a modification method is proposed to improve the behavioural characteristics of conventional moment connections. The modification involves replacing the continuous cover plate with two alternative plates having increased width and thickness at the location of the beam flange‐plates. The behaviour of the proposed connection was investigated in detail both experimentally, by means of two full‐scale specimens, and analytically, by means of eight finite element models. Based on the results obtained, in beams with a modified connection most of the plasticity develops remote from the column cover plate, and the panel zone remains in an elastic state. Accordingly, the deformation of the modified connection is reduced significantly and its stiffness is increased to the level required for a fully restrained connection. The hysteresis curves of the modified connection are also stable during large inelastic deformations with no substantial pinching. The modified connection provides the strength and ductility required in special moment frames.

Journal

Steel Construction: Design and Research – Wiley

Published: Feb 1, 2022

Keywords: moment connection; double‐ I column; column cover plate; special moment frame; fully restrained connection; Analysis and design; Steel buildings; Experiments; Berechnungs‐ und Bemessungsverfahren; Stahlhochbau; Versuche

References

  • Framing connection for square structural tubing
    White, R. N.; Fang, P. J.
  • Retrofitting of moment connection of double‐I built‐up columns using trapezoidal stiffeners
    Deylami, A.; Salami, M.
  • Seismic rehabilitation performance of steel side plate moment connections
    Chou, C. C.; Tsai, K. C.; Wang, Y. Y.; Jao, C. K.
  • Application of full depth side plate to moment connection of I‐beam to double‐I column
    Shiravand, M. R.; Deylami, A.
  • Experimental study on steel built‐up column moment connections with top and bottom trapezoidal side plates
    Shiravand, M. R.; Deylami, A.