Journal of the Korea institute for structural maintenance and inspection (한국구조물진단유지관리공학회 논문집)

Korea Institute for Structural Maintenance Inspection (한국구조물진단유지관리공학회)
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Flexural Behavior of Concrete-ECC Composite Beam Reinforced with Steel Rebar

철근 보강된 콘크리트-ECC 복합보의 휨 거동

  • Received : 2020.04.22
  • Accepted : 2020.05.21
  • Published : 2020.06.30
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Abstract

The purpose of this study is to investigate the flexural behavior and plastic hinge of reinforced concrete-ECC composite beams. Ordinary portland cement was used as a binder, and high volume fly ash was also used to improve the properties of ECC. An ECC designed in this study showed high tensile strain capacity of 3.0%. Three types of beams were manufactured according to the replacement length of concrete with ECC. From the bending tests, it was found that load-bearing capacity as well as ductility of beam increased with an increase in the replacement length of concrete with ECC. Curvature ductility and plastic hinge length of beam were also increased.

이 연구의 목적은 ECC를 적용한 RC 보 실험체의 휨 성능과 소성 힌지를 조사하는 것이다. ECC에는 1종 보통 포틀랜드 시멘트(OPC)를 결합재로 사용하였고, 플라이애시를 다량 혼입하여 결합재와 충전재 역할을 함과 동시에 균열폭 제어를 통한 다중 미세균열 확보하고자 하였다. 1축 인장성능 측정결과 최대 인장변형률은 3.0 % 확보하여 우수한 인장변형성능이 나타났다. ECC 치환길이에 따라 3가지 종류의 보를 제작하였다. ECC의 치환길이 변화에 따른 ECC-RC 보의 휨성능 실험 결과에서는 ECC의 적용으로 휨부재의 최대 내력과 연성이 동시에 증가하였다. 또한, ECC를 소성힌지부에 적용할 경우, 휨 부재의 곡률연성계수와 소성힌지 길이가 증가하는 것으로 나타났다.

Keywords

References

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