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Influence of Openings on the Structural Behavior of Shear Walls with Slabs

슬래브가 있는 전단벽의 구조적 거동에 대한 개구부의 영향

  • Published : 2008.02.29

Abstract

An experimental investigation was conducted with half-scale representations of the reinforced concrete shear walls with the opening subjected to cyclic loads. Specimens were half scale representations of a one-story wall in the apartment built in 1980. The area ratio of the opening section, as well as the size and critical section of coupling slabs, were decided based on results from a previous researches. The test result of WS-0.23 specimen, which has artificial damages to install the opening, the strength of the wall decreased due to the opening. It is apparent that influence of cutting reinforcing bars and decrease of effective section area lead to early first yield of the reinforcing bars before the allowable limit of drift ratio of the shear walls was reached. Therefore, proper reinforcing method is needed to prevent this. The decrease of strength of the shear walls by installation of openings shows a great deal of difference compared to previous researches. This is because flexural capacity of the slabs is working as coupling elements for the shear walls. The critical section of coupling slabs that works as coupling elements for shear walls was a little different from the results of previous researches.

현재 국내에서 건설되고 있는 대부분의 아파트는 철근콘크리트 전단벽과 바닥슬래브만으로 구성된 순수벽식구조 형태를 이용하고 있다. 이러한 벽식 구조 아파트에 대한 리모델링시 개구부 설치는 필연적이며 개구부 설치치 벽체의 거동은 매우 복잡하며, 연결부재인 보와 슬래브 같은 부재에 많은 영향을 받는다. 본 연구에서는 개구부가 있는 전단벽에 대해 횡하중 실험을 실시하였다. 실험체는 1980년대에 지어진 벽식 구조아파트를 대상으로 1/2축소 실험체를 제작하였다. 개구부의 면적 및 연결 슬래브의 위험단면은 기존 연구를 참고하여 결정하였다. 실험 결과 개구부 설치에 따른 내력 감소가 나타났으며, 연결 슬래브의 응력은 전단면에 대하여 균일하게 작용하지 않았다. 전단벽체와 커플링 작용을 하는 슬래브의 유효폭 및 위험단면은 기존 연구와 비교하여 큰 차이점을 나타냈으며, 국내의 아파트에 적용하기에는 다소 과소평가되고 있는 것으로 나타났다.

Keywords

References

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  1. A study on the retrofit method of a shear wall by new openings vol.64, pp.5, 2012, https://doi.org/10.1680/macr.10.00112
  2. Shear Strength Reduction Ratio of Reinforced Concrete Shear Walls with Openings vol.22, pp.4, 2010, https://doi.org/10.4334/JKCI.2010.22.4.451