Steel and Composite Structures

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Behaviour insights on damage-control composite beam-to-beam connections with replaceable elements

  • Xiuzhang He (School of Civil Engineering, Chongqing University) ;
  • Michael C.H. Yam (Department of Building and Real Estate, The Hong Kong Polytechnic University) ;
  • Ke Ke (School of Civil Engineering, Chongqing University) ;
  • Xuhong Zhou (School of Civil Engineering, Chongqing University) ;
  • Huanyang Zhang (School of Civil Engineering, Chongqing University) ;
  • Zi Gu (School of Civil Engineering, Chongqing University)
  • Received : 2022.10.08
  • Accepted : 2023.02.16
  • Published : 2023.03.25
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Abstract

Connections with damage concentrated to pre-selected components can enhance seismic resilience for moment resisting frames. These pre-selected components always yield early to dissipate energy, and their energy dissipation mechanisms vary from one to another, depending on their position in the connection, geometry configuration details, and mechanical characteristics. This paper presents behaviour insights on two types of beam-to-beam connections that the angles were designed as energy dissipation components, through the results of experimental study and finite element analysis. Firstly, an experimental programme was reviewed, and key responses concerning the working mechanism of the connections were presented, including strain distribution at the critical section, section force responses of essential components, and initial stiffness of test specimens. Subsequently, finite element models of three specimens were established to further interpret their behaviour and response that were not observable in the tests. The moment and shear force transfer paths of the composite connections were clarified through the test results and finite element analysis. It was observed that the bending moment is mainly resisted by axial forces from the components, and the dominant axial force is from the bottom angles; the shear force at the critical section is primarily taken by the slab and the components near the top flange. Lastly, based on the insights on the load transfer path of the composite connections, preliminary design recommendations are proposed. In particular, a resistance requirement, quantified by a moment capacity ratio, was placed on the connections. Design models and equations were also developed for predicting the yield moment resistance and the shear resistance of the connections. A flexible beam model was proposed to quantify the shear resistance of essential components.

Keywords

Acknowledgement

This work is supported by Science and Technology Commission of Shanghai Municipality through Shanghai Sailing Program (Grant No. 21YF1450700) and National Natural Science Foundation of China (Grant Nos. 52178111). Funding supports from the Fundamental Research Funds for the Central Universities 2022CDJQY-009 is acknowledged.

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