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Steel and Composite Structures
  Volume 38, Number 5, March10 2021 , pages 547-562

Component based moment-rotation model of composite beam blind bolted to CFDST column joint
Lei Guo, Jingfeng Wang, Wanqian Wang and Zhaodong Ding

    This paper aims to explore the mechanical behavior and moment-rotation model of blind bolted joints between concrete-filled double skin steel tubular columns and steel-concrete composite beams. For this type of joint, the inner tube and sandwiched concrete were additionally identified as basic components compared with CFST blind bolted joint. A modified moment-rotation model for this type of connection was developed, of which the compatibility condition and mechanical equilibrium were employed to determine the internal forces of basic components and neutral axis. Following this, load transfer mechanism among the inner tube, sandwiched concrete and outer tube was discussed to assert the action area of the components. Subsequently, assembly processes of basic coefficients in terms of their stiffness and resistances based on the component method by simplifying them as assemblages of springs in series or in parallel. Finally, an experimental investigation on four substructure joints with CFDST columns for validation purposes was carried out to capture the connection details. The predicted results derived from the mechanical models coincided well with the experimental results. It is demonstrated that the proposed mechanical model is capable of evaluating the complete moment-rotation relationships of blind bolted CFDST column composite connections.
Key Words
    component method; Moment-rotation model; concrete-filled double skin steel tubular (CFDST); blind bolt; composite joint
Lei Guo, Wanqian Wang and Zhaodong Ding: School of Civil Engineering, Hefei University of Technology, Tunxi Road 193, Anhui Province, 230009, China
Jingfeng Wang: School of Civil Engineering, Hefei University of Technology, Tunxi Road 193, Anhui Province, 230009, China;
Anhui Civil Engineering Structures and Materials Laboratory, Tunxi Road 193, Anhui Province, 230009, China

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