Steel and Composite Structures

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Application of a ductile connection system to steel MRF strengthened with hinged walls

  • Zhi Zhang (Thornton Tomasetti Inc.) ;
  • Yulong Feng (School of Civil Engineering, Hefei University of Technology) ;
  • Dichuan Zhang (School of Engineering and Digital Sciences, Nazarbayev University) ;
  • Zuanfeng Pan (Department of Civil and Environment Engineering, School of Engineering and Digital Sciences, Nazarene University)
  • Received : 2022.03.30
  • Accepted : 2024.05.20
  • Published : 2024.06.10
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Abstract

Steel moment resisting frames (MRFs) typically have inter-story drift concentrations at lower stories during earthquakes as found from previous research. Hinged walls (HWs) can be used as structural strengthening components to force the MRFs deform uniformly along the building height. However, large moment demands are often observed on HWs and make the design of HWs non-economical. This paper proposes a method to reduce the moment demand on HWs using a ductile connection system between the MRFs and the HWs. The ductile connection system is designed with a yield strength and energy dissipation capacity, for the purpose of limiting the seismic forces transferred to the HWs and dissipating seismic energy. Nonlinear time history analyses were performed using 10 far-filed earthquakes at maximum considered earthquake level. The analysis results show that the proposed ductile connection system can reduce: (1) seismic moment demands in the HWs; (2) floor accelerations; (3) the connection force between HWs and MRFs.

Keywords

Acknowledgement

The research described in this paper was financially supported by the National Natural Science Foundation of China (51708166), the China Postdoctoral Science Foundation (2018M630706), the Fundamental Research Funds for Central Universities of China (JZ2019HGTB0086), and Nazarbayev University Faculty Development Competitive Research Grant No. 201223FD8804. Their support is gratefully acknowledged.

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