Abstract
This paper proposes the double-endplates replaceable beam-column joint (DEBJ) based on the seismic design concept of replaceable beam. Compared to the common extended endplate bolted joint (CEBJ), the DEBJ is easy to be connected and replaced after earthquakes, and it can achieve plastic hinge outward movement in steel frame. Due to double endplates and different failure modes, the current moment-rotation models for CEBJ cannot be used for DEBJ. Therefore, based on the classical model used for traditional endplate joints, a theoretical moment-rotation model for DEBJ is developed, and the calculation methods on ultimate bending moment and initial rotational stiffness are deduced. A parametric study is performed for DEBJ based on a test-validated finite element (FE) model developed in this paper. The predicted moment-rotation curves calculated from proposed theoretical model is validated by the experimental results on endplate joints and FE results on DEBJ. The results show that the established theoretical model proposed in this paper can predict the moment-rotation relation curves of DEBJ and the common extended endplate bolted joint (CEBJ) accurately, the predicted results by established theoretical model are in good agreement with experimental and FE results according to the comparison. It is revealed that the established model has universality to some extent.
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Acknowledgements
In this paper, the research work was supported by the National Natural Science Foundation of China (52208224, 52378209,52008398), the Natural Science Foundation of Hunan Province, China (2021JJ41083, 2021JJ40743), , Hunan Province science and technology project Huxiang young talents program (2023RC3057), Xiaohe Sci-Tech Talents Special Funding under Hunan Provincial Sci-Tech Talents Sponsorship Program (2023TJ-X66), and the Technical Research Fund of China Railway No. 5 Engineering Group Co. LTD.
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Ma, X., Jiang, L., Hu, Y. et al. Moment-rotation model of double-endplates replaceable beam-column joint. Arch. Civ. Mech. Eng. 24, 150 (2024). https://doi.org/10.1007/s43452-024-00962-1
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DOI: https://doi.org/10.1007/s43452-024-00962-1