Journal of the Earthquake Engineering Society of Korea (한국지진공학회논문집)

Earthquake Engineering Society of Korea (한국지진공학회)
권호 표지
DOI QR코드

DOI QR Code

Seismic Behavior of RC Beam-Column Exterior Joints with Unbonded Tendons and High Strength Concrete

비부착 강연선과 고강도 콘크리트를 적용한 철근콘크리트 외부 접합부의 내진 거동

  • Kwon, Byung Un (Department of Architecture & Architectural Engineering, Seoul National University) ;
  • Kang, Thomas H.-K. (Department of Architecture & Architectural Engineering, Seoul National University)
  • Received : 2015.07.21
  • Accepted : 2015.09.25
  • Published : 2015.11.01
Download PDF
⟨ Previous Next ⟩

Abstract

In the moment frame subjected to earthquake loads, beam-column joint is structurally important for ductile behavior of a system. ACI Committee 352 proposed guidelines for designing beam-column joint details. The guidelines, however, need to be updated because of the lack of data regarding several factors that may improve the performance of joints. The purpose of this study is to investigate the seismic performance of reinforced concrete exterior joints with high-strength materials and unbonded tendons. Three specimens with different joint shear demand-to-strength ratios were constructed and tested, where headed bars were used to anchor the beam bars into the joint. All specimens showed satisfactory seismic behavior including moment strength of 1.3 times the nominal moment, ductile performance (ductility factor = at least 2.4), and sufficiently large dissipated energy.

Keywords

References

  1. Joint ACI-ASCE Committee 352. Recommendation for design of beam-column connections in monolithic reinforced concrete structures (ACI 352R-02). MI, USA: American Concrete Institute; c2002. 38 p.
  2. Ehsani MR, Alameddine F. Design recommendations for type 2 high-strength reinforced concrete connections. ACI Structural Journal. 1991 May-June;88(30):277-291.
  3. Kim Y-I, Kim M-S, Lee Y-K, Han H-S. Experimental study on the shear strength of ultra high-strength concrete exterior beam-column joints under cyclic loads. Journal of The Architectural Institute of Korea Structure & Construction. 2008 March;24(3):61-70. (in Korean)
  4. Lee B-S, Kim K-D, Kim S-W, Kim K-H, Lee J-Y. Evaluation of structural behavior of reinforced concrete exterior beam-column joints with high-strength concrete. Journal of the Korea Institute for Structural Maintenance and Inspection. 2014 November;18(6):72-81. (in Korean) https://doi.org/10.11112/jksmi.2014.18.6.072
  5. Hwang H-J, Park H-G, Choi W-S, Chung L, Kim J-K. Seismic performance of beam-column connections for special moment frame using 600 MPa flexural reinforcement. Journal of the Korea Concrete Institute. 2011 October;23(5):591-601. (in Korean) https://doi.org/10.4334/JKCI.2011.23.5.591
  6. Korea Concrete Institute. Design code for concrete structures. Seoul, Korea: Korea Concrete Institute; c2012. 599 p. (in Korean)
  7. ACI Committee 318. Building code requirements for structural concrete and commentary (ACI 318-11). MI, USA: American Concrete Institute; c2011. 503 p.
  8. Wallace JW, McConnell SW, Gupta P, Cote PA. Use of headed reinforcement in beam-column joints subjected to earthquake loads. ACI Structural Journal. 1998 September-October;95(5):590-602.
  9. Kang TH-K, Ha S-S, Choi D-U. Bar pullout tests and seismic tests of small-headed bars in beam-column joints. ACI Structural Journal. 2010 January-February;107(1):32-42.
  10. Chun SC, Lee SH, Kang TH-K, Oh B, Wallace JW. Mechanical anchorage in exterior beam-column joints subjected to cyclic loading. ACI Structural Journal. 2007 January-February;104(1):102-112.
  11. Kang TH-K, Kim W, Shin M. Cyclic testing for seismic design guide of beam-column joints with closely spaced headed bars. Journal of Earthquake Engineering. 2012;16(2):211-230. https://doi.org/10.1080/13632469.2011.610497
  12. ACI Committee 374. Acceptance criteria for moment frames based on structural testing and commentary (ACI 374.1-05). MI, USA: American Concrete Institute; c2005. 9 p.