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전단스팬비가 다른 보수된 벽체의 성능평가

Performance of Repaired Structural Walls with Different Shear Span Ratios

  • Han, Sang-Whan (Dept. of Architectural Engineering, Hanyang University) ;
  • Oh, Chang-Hak (Dept. of Architectural Engineering, Hanyang University) ;
  • Lee, Li-Hyung (Dept. of Architectural Engineering, Hanyang University)
  • 발행 : 2003.02.01

초록

철근 콘크리트 구조 벽체는 횡력에 대해 효과적으로 저항하고 변위를 제어할 수 있어 널리 이용되지만 지진 발생시 구조벽체가 붕괴에 이르지 않는다 하더라도 어느 정도의 손상은 예상해야 한다. 본 연구에서는 심하게 손상된 유효전단스팬비가 다른 철근 콘크리트 구조벽체의 단순 보수를 통해서 그 구조적 성능이 원래의 실험체에 비해 어느 정도 회복되는가를 평가하였다. 본 연구를 위하여 3개의 실험체 (전단스팬비 1, 2, 3)를 만들어 실험하였다. 실험은 원실험체를 점증 반복가력 재하로 심하게 손상시킨 후 실험체를 보수한 후 다시 재하하였다. 보수는 0.2mm이상의 균열부분의 콘크리트는 새 콘크리트로 교체하였고, 0.2mm이하의 균열은 단지 에폭시로 보수하였다. 또한 심하게 손상된 벽체 단부 부분의 철근은 같은 종류의 새 철근으로 교체되었다. 본 실험 연구를 통하여 단순보수를 통하여 벽체 강도는 회복 가능하나 변형능력은 회복이 되지 않는 것으로 나타났다.

The purpose of this study is to evaluate the capacities of repaired structural walls with different shear span ratios(1, 2, 3). Experimental tests were carried out. In this study three isolated large-scale wall specimens were made. The original wall specimens were tested until the drift reaches more than 3%. The region of the damaged specimen with the crack larger than 0.2 mm is replaced by new concrete. Also, severly distorted reinforcements were also replaced by new reinforcements. The crack smaller than 0.2 mm was cured by epoxy resin. Because of the space limitation of the laboratory the dimensions of all walls are the same. The shear-span ratio was controlled by the combination of axial and lateral force using the special test setting. All specimens were tested using the incremental quasi static cyclic load until failure occurs. Test results show that strength of repaired walls was almost equivalent to that of original walls. However, deformation capacities of repaired wall specimens are inferior to the original wall specimens.

키워드

참고문헌

  1. Oh, Young-Hun, Han, Sang Whan, and Li Hyung Lee, Effect of Shear Span Ratio (M/V ㆍ D) on Strength and Deformability in RC Structural Walls, submitted to the Journal of Korean Concrete Institute, KCI, 1999
  2. ACI Committee 318, Building code requirements for reinforcements concrete, ACI, 1995
  3. I.D. Lefas, MD.,Kotsovos (1990), 'Strength and Deformation Characteristics of Reinforced Concrete Walls with Load Reversals,' ACI Structural Journal,Vol.87, No.1, pp.23-31
  4. A.E., Fiorato et. al. (1983), 'Behavior of Eathquake Resistant Structural Walls Before and After Repair',ACI structural Journal, Proceeding, Vol.80,No.5, pp.403-413
  5. 한국콘크리트학회, 콘크리트구조설계기준, 1999