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

Liu, Ying; Wong, Simon H.F.; Zhang, Hexin; Kuang, J. S.; Lee, Pokman; Kwong, Winghei

Authors

Ying Liu

Simon H.F. Wong

J. S. Kuang

Pokman Lee

Winghei Kwong



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.

Citation

Liu, Y., Wong, S. H., Zhang, H., Kuang, J. S., Lee, P., & Kwong, W. (2021). Seismic behavior of non seismically designed eccentric reinforced concrete beam column joints. Earthquakes and Structures, An International Journal, 21(6), 613-625. https://doi.org/10.12989/eas.2021.21.6.613

Journal Article Type Article
Acceptance Date Aug 12, 2021
Publication Date 2021
Deposit Date Aug 13, 2021
Journal Earthquakes and Structures, An International Journal
Print ISSN 2092-7614
Electronic ISSN 2092-7622
Publisher Techno-Press
Peer Reviewed Peer Reviewed
Volume 21
Issue 6
Pages 613-625
DOI https://doi.org/10.12989/eas.2021.21.6.613
Keywords beam-column joint; eccentricity; shear strength; seismic behavior; design codes
Public URL http://researchrepository.napier.ac.uk/Output/2793361
Publisher URL http://www.techno-press.org/?journal=eas