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Theoretical model and structural performance of assembled joint between circular CFDST column and composite beam

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Abstract

Circular concrete filled double skin steel tubular (CFDST) has broader application aspects in engineering practice due to its superior confinement and elegant architectural appearance compared with square CFDST. However, there is still lack of an effective and reliable assembled method to connect the circular CFDST column to the beam. This paper focused on the theoretical and structural behavior on the assembled joint between circular CFDST column and composite beam. A sophisticated theoretical model was proposed to evaluate the initial rotational stiffness and moment capacity of the assembled joint. This theoretical model firstly accounted for the curved end plate in bending considering the clamping forces of blind bolts. Furthermore, a simplified arch model was developed to assess the circular steel tube in compression and the stiffness coefficients related to the circular CFDST column determined by the load transfer mechanism were also involved in the theoretical model. Subsequently, an experimental investigation on such kind of joint was conducted as a basis to verify the developed numerical model, indicating the numerical model could well replicate the typical failure modes and hysteresis curves. Parametric analyses based on the validated numerical model were performed to identify the effects of various parameters on the typical assembled joint. The theoretical model was verified to be capable of predicting the initial stiffness and moment capacity of assembled composite joint to circular CFDST column by comparing with the numerically observed results. The theoretical and analytical results performed in this paper would be beneficial for the application of the assembled beam to column joint in CFDST structures.

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Acknowledgements

This work is part of Projects 51478158 and 51178156 supported by the National Natural Science Foundation of China as well as Project NCET-12-0838 supported by the Program for New Century Excellent Talents in University. These financial supports are highly appreciated. The authors thank for the support by the Fundamental Research Funds for the Central Universities of China (Grant No. PA2019GDZC0094) and University collaborative innovation project in Anhui Province (Project GXXT-2019-005).

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Authors and Affiliations

  1. School of Civil Engineering, Hefei University of Technology, Hefei, 230009, Anhui Province, China

    Lei Guo, Jingfeng Wang & Wanqian Wang

  2. Anhui Key Laboratory of Civil Engineering Structures and Materials, Hefei, 230009, Anhui Province, China

    Jingfeng Wang

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  1. Lei Guo
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Correspondence to Jingfeng Wang.

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The author have made substantial contributions to the experimental and analytical investigation of the paper; or the acquisition, analysis, or interpretation of data for the paper; the co-listed authors Lei Guo and Wanqian Wang are doctoral students of mine who are also collaborate with me on this research work.

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Guo, L., Wang, J. & Wang, W. Theoretical model and structural performance of assembled joint between circular CFDST column and composite beam. Archiv.Civ.Mech.Eng 20, 75 (2020). https://doi.org/10.1007/s43452-020-00077-3

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