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Title |
Seismic Evaluation of Reinforced Concrete Building Retrofitted by a Novel Diamond-shaped Bracing Installed with a Laterally Layered Friction Damper
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Authors |
김현식(Hyun-Sik Kim) ; 이강석(Kang-Seok Lee) |
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DOI |
https://doi.org/10.11112/jksmi.2025.29.3.35 |
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Keywords |
철근콘크리트; 수평적층마찰댐퍼; 다이아몬드형 가새; 내진보강; 유사동적실험; 제진시스템 Reinforced concrete; Laterally layered friction damper; Diamond-shaped brace; Seismic rehabilitation; Pseudo dynamic test; Control system |
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Abstract |
In this research, a novel diamond-shaped bracing method installed with a Laterally Layered Friction Damper (LLFD) to address the limitations of conventional vibration control systems is proposed with the aim of applying it to existing reinforced concrete buildings. First, the material performance and energy dissipation capacity of the LLFD were evaluated through material testing, and simultaneously, a diamond-shaped bracing system installed with LLFD, designed with consideration for facade aesthetics, was selected through a survey-based approach. Two full-scale, two-story reinforced concrete frame specimens, modeled after a reinforced concrete building lacking seismic detailing, were prepared: one as an non-strengthened control, and the other retrofitted with the proposed LLFD diamond-shaped bracing system. A pseudo dynamic testing was performed to investigate the effectiveness of the seismic rehabilitation, focusing on key response parameters such as maximum shear strength, maximum displacement, and earthquake damage degree. The results demonstrated that the LLFD diamond-shaped bracing system significantly improved lateral load resisting capacity and reduced story deformation, even under severe seismic intensities including 400 and 500 cm/s2.
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