Journal of the Earthquake Engineering Society of Korea (한국지진공학회논문집)

Earthquake Engineering Society of Korea (한국지진공학회)
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Experimental Study of Ductility and Strength Enhancement for RC Columns Retrofitted with Several Types of Aramid Reinforcements

아라미드계 섬유 보강을 통한 RC기둥의 연성과 강도 증진에 대한 실험 연구

  • Lee, Gayoon (Deep Learning Architecture Research Center, Department of Architectural Engineering, Sejong University) ;
  • Lee, Dong-Young (Daesan Engineering & Glass) ;
  • Park, Minsoo (The Pick R&D Engineering) ;
  • Lee, Kihak (Deep Learning Architecture Research Center, Department of Architectural Engineering, Sejong University)
  • 이가윤 (세종대학교 건축공학과 딥러닝 건축연구소) ;
  • 이동영 ((주)대산이엔지) ;
  • 박민수 ((주)더픽알앤디) ;
  • 이기학 (세종대학교 건축공학과 딥러닝 건축연구소, 건축공학과)
  • Received : 2023.03.24
  • Accepted : 2023.04.27
  • Published : 2023.07.01
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Abstract

This study proposed a seismic reinforcement of RC columns with non-seismic details, a fiber reinforcement method of aramid sheets and MLCP (high elasticity aromatic polyester fiber material) with different characteristics, and 4 full-size column specimens and conducted experiments. The results show that a non-seismic specimen (RC-Orig) rapidly lost its load-bearing capacity after reaching the maximum load, and shear failure occurred. The RC column reinforced with three types of aramid did not show an apparent increase in strength compared to the unreinforced specimen but showed a ductile behavior supporting the load while receiving a lateral displacement at least 1.57 to 1.95 times higher than the unreinforced specimen. The fracture mode of the specimen, according to the application of lateral load, also changed from shear to ductile fracture through aramid-based reinforcement. In addition, when examining the energy dissipation ability of the reinforced specimens, a ductile behavior dissipating seismic energy performed 4 times greater and more stably than the existing specimens.

Keywords

Acknowledgement

본 논문은 2022년 (주)대산이엔지의 연구비 지원과 2022년 산업통상 자원부 (20010999) 연구비 지원에 의해 수행되었습니다. 이에 감사드립니다.

References

  1. Architectural institute of Korea. Site Inspection and Damage Investigation of Buildings by Earthquakes in Gyeongju and Pohang. c2018.
  2. Tomorrow, ATC Here Today-Here. The Road to Earthquake Resilience in San Francisco, Com-munity Action Plan for Seismic Safety. ATC-52-2 Report, Applied Technology Council, Redwood City, California. c2010.
  3. Eom TS, Lee SJ, Park HG. Investigation of structural damage in bearing wall buildings with pilotis by 2017 Pohang earthquake. Journal of the Earthquake Engineering Society of Korea. 2019; 23(1):9-18. https://doi.org/10.5000/EESK.2019.23.1.009
  4. Kim T, Chu Y, Kim SR, Bhandari D. Seismic behavior of domestic piloti-type buildings damaged by 2017 Pohang earthquake. Journal of the Earthquake Engineering Society of Korea. 2018;22(3):161-168. https://doi.org/10.5000/EESK.2018.22.3.161
  5. MOE. Guideline for Seismic Evaluation and Rehabilitation of Existing School Buildings. Ministry of Education. Sejong. c2021.
  6. Lee HH, Koo ES. A experimental study on the capacity evaluation of the shear-strengthened RC column with aramid fiber sheet. Journal of the Architectural Institute of Korea, Structure & Construction. 1999;15(6):29-36.
  7. Choi JJ, Lee TH, Ryoo JY, Rho KG, Choi SM. FRP Seismic Reinforcement Method of Pilotty Structures Column Expected to be Damaged by Pohang Earthquake. Magazine of the Korean Society Advanced Compostite Structures. 2018;9(3):14-21. https://doi.org/10.11004/kosacs.2018.9.4.014
  8. Hoang DV. Experimental investigation of RC corner columns with varying seismic details under different lateral and vertical loading. Master Thesis. Sejong University. c2014.
  9. Korean Standards Association. KS F 2403 Standard test method for making concrete specimens. Korean Standards Association. c2019.
  10. Korean Standards Association. KS F 2405. Standard Test Method for Compressive Strength of Concrete. Korean Standards Association. c2017.
  11. Korean Standards Association. KS B 0802. Method of Tensile Test for Metallic Materials. Korean Standards Association. c2018.
  12. FEMA 461. Interim testing protocols for determining the seismic performance characteristics of structural and nonstructural components. c2007.
  13. ACI 440.2R-08. Guide for design and construction of externally bonded FRP systems for strengthening concrete structures. c2008
  14. Ye L, Yue Q, Zhao S, Li Q. Shear strength of reinforced concrete columns strengthened with carbon-fiber-reinforced plastic sheet. Journal of Structural Engineering. 2002;128(12):1527-1534.  https://doi.org/10.1061/(ASCE)0733-9445(2002)128:12(1527)