Earthquakes and Structures

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Seismic behavior of non-seismically designed eccentric reinforced concrete beam-column joints

  • Liu, Ying (Faculty of Science and Technology, Technological and Higher Education Institute of Hong Kong) ;
  • Wong, Simon H.F. (Faculty of Science and Technology, Technological and Higher Education Institute of Hong Kong) ;
  • Zhang, Hexin (School of Engineering and The Built Environment, Edinburgh Napier University Edinburgh) ;
  • Kuang, J.S. (Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology) ;
  • Lee, Pokman (Faculty of Science and Technology, Technological and Higher Education Institute of Hong Kong) ;
  • Kwong, Winghei (Faculty of Science and Technology, Technological and Higher Education Institute of Hong Kong)
  • Received : 2021.06.16
  • Accepted : 2021.08.18
  • Published : 2021.12.25
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Abstract

Non-seismically designed eccentric reinforced concrete beam-column joints were extensively used in existing reinforced concrete frame buildings, which were found to be vulnerable to seismic action in many incidences. To provide a fundamental understanding of the seismic performance and failure mechanism of the joints, three 2/3-scale exterior beam-column joints with non-seismically designed details were cast and tested under reversed cyclic loads simulating earthquake excitation. In this investigation, particular emphasis was given on the effects of the eccentricity between the centerlines of the beam and the column. It is shown that the eccentricity had significant effects on the damage characteristics, shear strength, and displacement ductility of the specimens. In addition, shear deformation and the strain of joint hoops were found to concentrate on the eccentric face of the joint. The results demonstrated that the specimen with an eccentricity of 1/4 column width failed in a brittle manner with premature joint shear failure, while the other specimens with less or no eccentricity failed in a ductile manner with joint shear failure after beam flexural yielding. Test results are compared with those predicted by three seismic design codes and two non-seismic design codes. In general, the codes do not accurately predict the shear strength of the eccentric joints with non-seismic details.

Keywords

Acknowledgement

The work described in this paper was fully supported by a grant from the Research Grants Council of the Hong Kong Special Administrative Region, China (Project No. UGC/FDS25/E08/17).

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