Journal of the Architectural Institute of Korea (대한건축학회논문집)

Architectural Institute of Korea (대한건축학회)
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Seismic Retrofit Method for Reinforcement Concrete Column Using Steel Rod Subjected to Torsional Load

길이조절식 강관을 이용한 철근콘크리트 기둥의 비틀림을 고려한 내진보강효과

  • Lim, Ji Hoon (Dept. of Architectural Engineering, Kyung Hee University) ;
  • Kim, Chan Hwi (Dept. of Architectural Engineering, Kyung Hee University) ;
  • Lee, Young Hak (Dept. of Architectural Engineering, Kyung Hee University)
  • Received : 2021.12.20
  • Accepted : 2022.03.02
  • Published : 2022.03.30
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Abstract

The seismic retrofit method for reinforced concrete (RC) column using steel rod is proposed to resist combined load including torsion and to enhance constructability. The proposed method involves the installation of steel rods on the RC column externally to improve seismic capacity when subjected to seismic load. To investigate seismic performance, three RC columns with non-seismic detail were manufactured and a cyclic loading test was conducted. To evaluate the seismic performance of retrofitted column in practical, the eccentricity of both axial and lateral load was applied on control specimen and on one retrofitted column; to compare the effect of eccentricity of axial load, the other retrofitted column was subjected to no eccentricity on axial load. The experiment results indicated that the proposed steel rod retrofit method effectively resisted seismic load by enhancing the maximum load about 61% compared to the control specimen. Similar to the result of maximum load, retrofitted column showed improvement in twist response, effective stiffness, ductility, and energy dissipation capacity. Additionally, since torsion is applied by eccentric lateral load on RC column, the concentric axial load caused the reduction of seismic capacity compared to eccentric axial load.

Keywords

Acknowledgement

이 성과는 정부(과학기술정보통신부)의 재원으로 한국연구재단의 지원을 받아 수행된 연구임.(No. 2020R1A2C2009351)

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