Journal of the Earthquake Engineering Society of Korea (한국지진공학회논문집)

Earthquake Engineering Society of Korea (한국지진공학회)
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Seismic Performance Evaluation of Reinforced Concrete Buildings Strengthened by Embedded Steel Frame

내부 매입형 철골조로 보강된 철근콘크리트 건물의 내진 성능평가

  • Kim, Seonwoong (School of Smart City Engineering, Youngsan University) ;
  • Lee, Kyungkoo (Department of Architectural Engineering, Dankook University)
  • 김선웅 (영산대학교 스마트시티공학부) ;
  • 이경구 (단국대학교 건축공학과)
  • Received : 2019.10.02
  • Accepted : 2019.12.05
  • Published : 2020.01.01
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Abstract

This study is to investigate the effect of a retrofitted reinforced concrete frame with non-seismic details strengthened by embedded steel moment frames with an indirect joint, which mitigates the problems of the direct joint method. First, full-scale experiments were conducted to confirm the structural behavior of a 2-story reinforced concrete frame with non-seismic details and strengthened by a steel moment frame with an indirect joint. The reinforced concrete frame with non-seismic details showed a maximum strength of 185 kN at an overall drift ratio of 1.75%. The flexural-shear failure of columns was governed, and shear cracks were concentrated at the beam-column joints. The reinforced concrete frame strengthened by the embedded steel moment frames achieved a maximum strength of 701 kN at an overall drift ratio of 1.5% so that the maximum strength was about 3.8 times that of the specimen with non-seismic details. The failure pattern of the retrofitted specimen was the loss of bond strength between the concrete and the rebars of the columns caused by a prying action of the bottom indirect joint because of lateral force. Furthermore, methods are proposed for calculation of the specified strength of the reinforced concrete frame with non-seismic details and strengthened by the steel moment frame with the indirect joint.

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References

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