Earthquakes and Structures

  • 제8권5호
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  • Pages.1017-1038
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  • 2015
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  • 2092-7614(pISSN)
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  • 2092-7622(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Strengthening of non-seismically designed beam-column joints by ferrocement jackets with chamfers

  • Li, Bo (Department of Civil & Environmental Engineering, The Hong Kong Polytechnic University) ;
  • Lam, Eddie Siu-Shu (Department of Civil & Environmental Engineering, The Hong Kong Polytechnic University) ;
  • Cheng, Yuk-Kit (Department of Civil & Environmental Engineering, The Hong Kong Polytechnic University) ;
  • Wu, Bo (School of Civil Engineering & Transportation, South China University of Technology) ;
  • Wang, Ya-Yong (Institute of Earthquake Engineering, China Academy of Building Research)
  • 투고 : 2014.04.11
  • 심사 : 2014.08.15
  • 발행 : 2015.05.25
⟨ 이전 논문 다음 논문 ⟩

초록

This paper presents a strengthening method that involves the use of ferrocement jackets and chamfers to relocate plastic hinge for non-seismically designed reinforced concrete exterior beam-column joints. An experimental study was conducted to assess the effectiveness of the proposed strengthening method. Four half-scale beam-column joints, including one control specimen and three strengthened specimens, were prepared and tested under quasi-static cyclic loading. Strengthening schemes include ferrocement jackets with or without skeleton reinforcements and one or two chamfers. Experimental results have indicated that the proposed strengthening method is effective to move plastic hinge from the joint to the beam and enhance seismic performance of beam-column joints. Shear stress and distortion within the joint region are also reduced significantly in strengthened specimens. Skeleton reinforcements in ferrocement provide limited improvement, except on crack control. Specimen strengthened by ferrocement jackets with one chamfer exhibits slight decrease in peak strength and energy dissipation but with increase in ductility as compared with that of two chamfers. Finally, a method for estimating moment capacity at beam-column interface for strengthened specimen is developed. The proposed method gives reasonable prediction and can ensure formation of plastic hinge at predetermined location in the beam.

키워드

참고문헌

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  3. Study on seismic strengthening of railway bridge pier with CFRP and concrete jackets vol.15, pp.3, 2015, https://doi.org/10.12989/eas.2018.15.3.275
  4. Seismic retrofit of exterior RC beam-column joint using diagonal haunch vol.174, pp.None, 2018, https://doi.org/10.1016/j.engstruct.2018.07.100
  5. Innovative Upscaling of Architectural Elements for Strengthening Building Structures vol.11, pp.9, 2019, https://doi.org/10.3390/su11092636
  6. Experimental studies on reinforced concrete interior beam-column joints strengthened by unsymmetrical chamfers vol.191, pp.None, 2019, https://doi.org/10.1016/j.engstruct.2019.03.099
  7. Load transfer mechanism of exterior beam-column joint with unsymmetrical chamfer vol.248, pp.None, 2021, https://doi.org/10.1016/j.engstruct.2021.113239
  8. Seismic strengthening of deficient RC frames using self-centering friction haunches vol.248, pp.None, 2015, https://doi.org/10.1016/j.engstruct.2021.113261