초록 열기/닫기 버튼
본 연구에서는 기존 철근콘크리트(RC) 골조에 철골 가새 및 철골 끼움골조로 보강하여 내진성능평가를 수행하여 내진보강 효과에 대하여 검증하였다. 철골 가새 및 철골 끼움골조는 앵커 정착 등으로 인한 높은 시공성능이 요구되지만, 다른 내진보강방법과 비교하여 확실한 내진보강 효과를 얻을 수 있다. 그러나 현재 기준에서는 철골 가새 및 철골 끼움골조를 활용한 내진보강방법에 관한 구체적인 설계절차에 대해서는 포함하고 있지 않다. 따라서 본 연구에서는 철골 가새 및 철골 끼움골조를 활용한 내진보강방법에 관한 구체적인 설계절차 마련을 위하여 내진성능평가가 수행되었다. 이를 위하여 철골 가새로 보강하였을 때에는 기존 골조 대비 휨강성 2배 및 3배 강성 증진을 목표로 하였고, 철골 끼움골조를 보강하였을 때에는 4배 강성 증진을 목표로 하였으며, 직접강성법을 통해 부재를 선정하였다. 내진성능평가 결과, 철골 부재로 보강된 실험체는 설계단계에서 목표로 한 휨강성과 거의 유사하였고, 기존 골조 대비하여 눈에 띄는 강도/강성 증진 효과를 확인할 수 있었다.
The purpose of this study was to evaluate the seismic performance of existing RC frames retrofitted with steel chevron bracing and infilled frame by conducting an experiment study. Although the steel chevron bracing and infilled frame require high constructability, these approaches known to be more effective than other seismic retrofitting methods to provide lateral strength and stiffness. However, specific design procedures and methods for retrofitting steel chevron bracing and infilled frames are not included in the current guidelines. In this study, an experimental study was conducted to produce fundamental data for developing seismic retrofitting design methods for existing RC frames with steel chevron bracing and infilled frame. In order to evaluate the seismic performance of the existing RC frames retrofitted with steel members, a total of four specimens were manufactured, and the flexural stiffness of all specimens was calculated using the direct stiffness method. Two of the specimens were reinforced with a steel chevron bracing system, and designed to be two to three times the flexural stiffness of the existing RC frames, respectively. In addition, one specimen was retrofitted with an steel infilled frame and was designed to be four times the flexural stiffness of the existing RC frame, and one specimen was not reinforced. Test results revealed that the specimens retrofitted with the steel member almost similar target flexural stiffness to that calculated by the direct stiffness method. It was confirmed that retrofitted specimens showed a notable increase in strength and stiffness compared to the existing RC frame.
키워드열기/닫기 버튼
chevron bracing, infilled frame, reinforced concrete frame, seismic performance evaluation
