Journal of the Korea Concrete Institute (콘크리트학회논문집)

Korea Concrete Institute (한국콘크리트학회)
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Experimental Study on RC Frame Structures with Non-Seismic Details Strengthened by Externally-Anchored Precast Wall-Panel Method (EPWM)

외부 앵커압착형 프리캐스트 벽체로 보강된 비내진 상세를 갖는 철근콘크리트 골조에 대한 실험적 연구

  • Choi, Seung-Ho (Department of Architectural Engineering, University of Seoul) ;
  • Hwang, Jin-Ha (Department of Architectural Engineering, University of Seoul) ;
  • Lee, Deuck Hang (Department of Architectural Engineering, University of Seoul) ;
  • Kim, Kang Su (Department of Architectural Engineering, University of Seoul) ;
  • Kwon, Yong-Keun (HI Structural Engineers) ;
  • Kim, Kil-Hee (Department of Architectural Engineering, Kongju National University)
  • Received : 2015.04.29
  • Accepted : 2015.05.11
  • Published : 2015.08.30
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Abstract

The infill-wall strengthening method has been widely used for the seismic performance enhancement of the conventional reinforced concrete (RC) frame structures with non-seismic detail, which is one of the promising techniques to secure the high resisting capacity against lateral forces induced by earthquake. During the application of the infill-wall strengthening method, however, it often restricts the use of the structure. In addition, it is difficult to cast the connection part between the wall and the frame, and also difficult to ensure the shear resistance performances along the connection. In this study, an advanced strengthening method using the externally-anchored precast wall-panel (EPCW) was proposed to overcome the disadvantages of the conventional infill-wall strengthening method. The one-third scaled four RC frame specimens were fabricated, and the cyclic loading tests were conducted to verify the EPCW strengthening method. The test results showed that the strength, lateral stiffness, energy dissipation capacity of the RC frame structures strengthened by the proposed EPCW method were significantly improved compared to the control test specimen.

비내진 상세를 갖는 노후된 철근콘크리트 골조의 내진보강을 위해 철근콘크리트 끼움벽 공법이 많이 사용되고 있다. 기존 콘크리트 골조에 끼움벽을 이용하여 보강하는 방법은 지진과 같은 횡력에 대하여 높은 강도를 확보할 수 있는 방법이다. 그러나, 기존의 끼움벽공법은 공사기간동안 이용자의 사용이 제한될 수 밖에 없으며, 접합부의 시공이 어렵고, 접합부의 합성성능을 확보하기 어려운 측면이 있다. 이 연구에서는 기존 끼움벽 공법의 단점을 개선하기 위하여 공장제작된 프리캐스트 콘크리트 벽체를 건물의 외부에서 압착하여 보강하는 방법을 제안하였다. 제안된 공법을 검증하기 위하여 반복하중을 받는 총 4개의 1/3축소 실험체들을 제작하여 실험을 수행하였으며, 제안된 공법이 적용된 철근콘크리트 골조의 강도, 강성, 에너지 소산 능력이 크게 향상되는 것을 실험적으로 확인하였다.

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References

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