동결융해에 따른 철근콘크리트 보 구조물의 거동 특성 평가

This study compared and analyzed the long-term behavior characteristics and final failure patterns of freeze-thawing of reinforced concrete beam structures through an experimental study. Reinforced concrete beam specimens and material specimens were prepared, and freezing and thawing were repeatedly performed using a freeze-thawing chamber. For freezing and thawing, the reinforced concrete structures were evaluated by referring to existing test methods. The effects of freeze-thawing were evaluated by examining the change of the material properties of concrete and the behavior of reinforced concrete beam structures. Through the proposed freeze-thawing test method, the compressive strength of the concrete specimens was reduced by about 19%. In the case of the reinforced concrete beam specimens, the surface strength of the concrete was reduced by freeze-thawing, causing sinusoidal cracking to decrease the performance of the structure because of the reduction of the material strength. Furthermore, the energy dissipation capacity of the freeze-thawing specimens with sinusoidal cracking occurred less than those of the freeze-thawing specimens.