本研究では，RC建物を外付け鉄骨制振フレームで改修する場合の粘性ダンパーの設計法を提案しました。耐震性能が不足した既存施設が多数ある国々を対象とする制振改修設計法シリーズの1つです。論文はこちら
This study proposes an alternative type of seismic retrofitting method for reinforced concrete (RC) buildings with a combination of viscous dampers and elastic steel frames, designed using an equivalent linearization approach. Within the scope of the study, the effect of composite behavior between the RC and closed steel frames is also considered as a key factor to reduce the demand of viscous dampers. A four-story RC school building is examined, and the proposed retrofit design method is validated using nonlinear response history analyses. The analysis results suggest that the proposed retrofit method can control maximum story drift ratio close to the design target. In addition, residual story drift ratios of the retrofitted buildings are substantially reduced. These results imply that both structural and nonstructural damage could be effectively mitigated in the retrofitted buildings using the proposed method that enhances self-centering properties.