Journal of the Earthquake Engineering Society of Korea (한국지진공학회논문집)

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

DOI QR Code

Suitability Evaluation of Design Methods for Lateral Confinement Region of T-Shaped Walls Based on Finite Element Analysis

유한요소해석에 기반한 국내 고층아파트 T형 벽체의 횡보강 영역 산정방법의 적합성 평가

  • Yun, Seong Jun (School of Architecture, Soongsil University) ;
  • Kim, Sung Hyun (School of Architecture, Soongsil University) ;
  • Kang, Su Min (School of Architecture, Soongsil University) ;
  • Lee, Deuckhang (Department of Architectural Engineering, Chungbuk National University) ;
  • Lee, Wonjun (Department of Architectural Engineering, Chungbuk National University)
  • Received : 2024.08.28
  • Accepted : 2024.10.04
  • Published : 2024.11.01
Download PDF
⟨ Previous Next ⟩

Abstract

Recently, high-rise residential buildings in Korea have adopted slender shear walls with irregular section shapes, such as T-shape, H-shape, and C-shape. In the seismic design of the slender shear walls, the transverse reinforcement for lateral confinement should be provided in the boundary elements to increase deformation capacity and subsequent ductility. However, in practice, the irregularity of the shear walls is not adequately considered, and the lateral confinement region is calculated for the rectangular wall segments. This study investigated the proper design method for lateral confinement regions using finite element analysis. The lateral confinement region was considered in analysis for two cases: 1) as a typical rectangular wall segment and 2) as an irregular wall. When the irregularity of the walls was considered, the compression zone depth was increased because the vertical reinforcement in the flange was addressed. The effect of lateral confinement design methods on the structural performance of the walls was directly compared under various design parameters, including the length of the flange, concrete compressive strength, vertical rebar layout, axial load ratio, and loading direction. According to the results of the parametric analysis, the peak strength and deformation capacity could be significantly increased when the lateral confinement region was calculated based on irregularly shaped walls, regardless of the design parameters. In addition, the effective compression zone was located within the lateral confinement region. Thus, it is recommended that the lateral confinement region of T-shaped walls is calculated by addressing the irregularity of the walls.

Keywords

Acknowledgement

본 연구는 한국과학재단이 주관하는 중견연구자지원사업(No. 2021R1A2C1012314)의 지원을 받아 수행되었습니다

References

  1. Korea Meteorological Administration. 2023 Seismological annual report; c2023.
  2. Statistics Korea. 2023 Population and housing census results. Daejeon (KR): Statistics Korea; c2023.
  3. ACI Committee 318, Building Code Requirements for Structural Concrete and Commentary (ACI 318-19). American Concrete Institute; c2019.
  4. KDS 14 20 00. Concrete Structural Design Code. Korea Construction Standards Center; c2021.
  5. Bang JS, Gang GS, Han GS. Application of building using optimal design of irregular wall. Computational Structural Engineering. 2015;28(1):47-52.
  6. Nam HS, Eom TS. Biaxial interaction and load contour method for reinforced concrete C- and H- shaped structural walls. Journal of the Korea Concrete Institute. 2017 Apr;29(2):189-200.
  7. Paulay T, Goodsir WJ. The ductility of structural walls. Bulletin of the New Zealand Society for Earthquake Engineering. 1985 Sep;18(3):250-269.
  8. Thomsen IV JH. Displacement based design of reinforced concrete structural walls: An experimental investigation of walls with rectangular and T-shaped cross-sections. Clarkson University; c1995
  9. Wallace JW. Seismic design of RC structural walls. Part I: New code format. Journal of Structural Engineering. 1995 Jan;121(1):75-87.
  10. Segura JR, Christopher L, Wallace JW. Impact of geometry and detailing on drift capacity of slender walls. ACI Struct J. 2018 May;115(3):885-895.
  11. Kim HD, Lee SH, Cho JH, Kim SH, Kang SM. Moment-curvature relationship of RC structural walls with confined boundary elements using pre-fabricated rectangular continuous hoops. J Comput Struct Eng Inst Korea. 2022 Feb;35(1):45-55.
  12. Chun YS, Park JY. Seismic performance of special shear wall with modified details in boundary element depending on axial load ratio. LHI Journal. 2016 Mar;7(1):31-41.
  13. Song JK, Chun YS, Song JW, Yang KH, Chang KK. Seismic performance of special structural walls using overlapping hoops instead of closed hoops. International Journal of Concrete Structures and Materials. 2019 Apr:13(25).
  14. Tripathi M, Dhakal RP, Dashti F. Bar buckling in ductile RC walls with different boundary zone detailing: Experimental investigation. Eng Struct. 2019 Aug;198:109544.
  15. Kim SH, Lee EK, Kang SM, Park HG, Park JH. Effect of boundary confinement on ductility of RC walls. Engineering Structures. 2021 Dec;230:111695.
  16. Kim MS, Kim SH, Kang SM, Lee JW. Cyclic loading test for reinforced concrete wall confined with prefabricated rectangular continuous hoops. Journal of Building Engineering. 2024 Nov;97:110681.
  17. Hognestad E. study of combined bending and axial load in reinforced concrete members. Urbana (IL): University of Illinois Engineering Experiment Station; c1951. 128 p.
  18. Kim MS. Seismic performance evaluation of RC structural walls with prefabricated rectangular continuous hoops [master's thesis]. Soongsil University. 2024:65.
  19. Han SW, Oh YH, Lee LH. Effect of edge confinement on deformation capacity in the isolated RC strcutural walls. J Korea Concr Inst. 1999 Dec;11(6):101-112.
  20. ATENA Program Documentation Part1 Theroy. Vladimir Cervenka, Libor Jendele, and Jan Cervenka; c2022 Sep.
  21. Kupfer H, Hilsdorf HK, Rusch H. Behavior of concrete under biaxial stresses. Journal ACI, Proceedings. 1969 Aug;66(8):656-666.
  22. Thomsen IV JH, Wallace JW. Displacement-Based design of slender reinforced concrete structural walls-Experimental verification. J Struct Eng. 2004 Mar;130(4).
  23. Mander JB, Priestley MJ, Park R. Theoretical stress-strain model for confined concrete. J Struct Eng. 1988 Sep;114(8):1804-1826.
  24. NIST GCR 14-917-25. Recommendations for seismic design of reinforced concrete wall buildings based on studies of the 2010 Maule, Chile earthquake. Gaithersburg, MD: National Institute of Standards and Technology; c2014. 322 p.