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Title |
Seismic Performance Evaluation of Existing Reinforced Concrete Frame Retrofitted with Steel Chevron Bracing and Infilled Frame
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Authors |
오근영(Keunyeong Oh) ; 이강민(Kangmin Lee) ; 이경구(Kyungkoo Lee) |
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DOI |
https://doi.org/10.4334/JKCI.2020.32.4.387 |
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Keywords |
철골 역V형 가새; 철골 끼움골조; 철근콘크리트 골조; 내진성능평가 chevron bracing; infilled frame; reinforced concrete frame; seismic performance evaluation |
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Abstract |
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.
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