Steel and Composite Structures

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Modelling and experiment of semi rigid joint between composite beam and square CFDST column

  • Guo, Lei (School of Civil Engineering, Hefei University of Technology) ;
  • Wang, Jingfeng (School of Civil Engineering, Hefei University of Technology) ;
  • Zhang, Meng (School of Civil Engineering, Hefei University of Technology)
  • Received : 2019.09.16
  • Accepted : 2020.02.20
  • Published : 2020.03.25
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Abstract

Semi-rigid connections with blind bolts could solve the difficulty that traditional high strength bolts were unavailable to splice a steel/composite beam to a closed section column. However, insufficient investigations have focused on the performance of semi-rigid connection to square concrete filled double-skin steel tubular (CFDST) columns. In this paper, a component model was developed to evaluate the mechanical behavior of semi-rigid composite connections to CFDST columns considering the stiffness and strength of column face in compression and column web in shear which were determined by the load transfer mechanism and superstition method. Then, experimental investigations on blind bolted composite joints to square CFDST columns were conducted to validate the accuracy of the component model. Dominant failure modes of the connections were analyzed and this type of joint behaved semi-rigid manner. More importantly, strain responses of CFDST column web and tubes verified that stiffness and strength of column face in compression and column web in shear significantly affected the connection mechanical behavior owing to the hollow part of the cross-section for CFDST column. The experimental and analytical results showed that the CFDST column to steel-concrete composite beam semi-rigid joints could be employed for the assembled structures in high intensity seismic regions.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation

The experiments conducted in this paper is supported by National Natural Science Foundation Project 51478158 and 51178156. Also, the staff in Anhui Civil Engineering Structures and Materials Laboratory is highly appreciated.

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