Steel and Composite Structures

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Cyclic behavior of steel beam-to-column connections with novel strengthened angle components

  • Kang, Lan (State Key Laboratory of Subtropical Building Science, South China University of Technology) ;
  • Zhang, Cheng (School of Civil Engineering and Transportation, South China University of Technology)
  • Received : 2021.09.10
  • Accepted : 2022.03.28
  • Published : 2022.03.25
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Abstract

As a type of semi-rigid connection, the top and seat angle connections are popular in current structures owing to their good cyclic performance and simple erection. However, their stiffness and load bearing capacity are relatively insufficient. This study proposes two strengthening methods to further increase the stiffness and strength of bolted-angle joints while maintaining satisfactory energy dissipation capacity (EDC) and ductility. Cyclic loading tests were conducted on six joint specimens with different strengthened angle components. Based on the test results, the influence of the following important factors on the cyclic behavior of steel joint specimens was investigated: the position of the rib stiffeners (edge rib stiffeners and middle rib stiffener), steel strength grade of rib stiffeners (Q345 and Q690), and additional stiffeners or not. In addition, the finite element models of these specimens were built and validated through a comparison of experimental and numerical results. The stiffness and bearing capacity of the bolted-angle joints could be improved significantly by utilizing the novel strengthened joints proposed in this study. Moreover, this can be achieved with almost no increase in the amount of steel required, and the EDC of this joint could also satisfy the requirements of seismic codes from various countries.

Keywords

Acknowledgement

This research was financially supported by the Natural Science Foundation of Guangdong Province (2020A1515011070), the Guangdong Province Special Support Program "Innovating Science and Technology for Young Top Talents" (2016TQ03Z528), the Fundamental Research Funds for the Central Universities (D2191360), and the Guangdong Provincial Key Laboratory of Modern Civil Engineering Technology (2021B1212040003). All the sources of support are gratefully acknowledged.

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