含摩擦阻尼器鋼筋混凝土結構耐震補強之性能設計法及耐震評估

Performance-Based Design and Assessment of Friction Dampers for Seismic Retrofit of a Reinforced-Concrete Structure

10.6849/SE.202409_39(3).0005

葉士瑋(Shih-Wei Yeh)；盧煉元(Lyan-Ywan Lu)；蕭輔沛(Fu-Pei Hsiao)；郭聖勤(Sheng-Qin Quo)；陳品存(Pin-Tsun Chen)；張簡嘉賞(Chia-Shang Chang Chien)

結構耐震補強 ； 摩擦阻尼器 ； 性能設計法 ； 耐震評估 ； BN文氏模型 ； 鋼筋混凝土結構 ； seismic retrofit ； friction damper ； performance-based design ； seismic assessment ； Bouc-Wen-Baber-Noori model ； reinforced-concrete structure

結構工程

39卷3期（2024 / 09 / 01）

87 - 120

繁體中文;英文

阻尼器補強屬先進之建築物耐震性能補強方法，且已有許多學者提出各類阻尼器之設計方法，但多以黏滯型或金屬降伏型阻尼器較為常見，而以摩擦阻尼器進行建物耐震補強之性能設計法與耐震評估等相關研究較為少見。有鑑於此，本文提出結合容量震譜法及規範公式之摩擦型阻尼器性能設計方法，該設計方法係引入性能設計之概念，可用以提升建物之耐震等級至預設之性能目標。為驗證本文所提摩擦阻尼器性能設計法之有效性，本文選擇一棟七層樓鋼筋混凝土（reinforced concrete, RC）建築物，並按照上述之性能設計法之計算流程以獲得摩擦阻尼器之參數。接著以11筆反應譜相容之震波進行動力歷時分析，以評估摩擦阻尼器之補強效果。其中，為了精確模擬RC結構之非線性行為，本文於結構數值模型中引入Bouc-Wen-Baber-Noori模型以模擬一樓柱構件之塑性行為。本文模擬結果顯示前述RC結構於設計地震力作用下之耐震性能等級，可由補強前的避免倒塌耐震等級提升至生命安全之耐震等級，符合預設之性能設計目標，由此驗證本文提出摩擦阻尼器性能設計法之準確性。再者，摩擦阻尼器補強後之一樓層間變位角減震率可達約40%，而頂樓加速度減震率亦可達6%，故可看出摩擦阻尼器不但對於結構位移之減震效果相當顯著，也同時於加速度反應有減震效果。

The use of dampers for seismic retrofit of a building structure is an advanced retrofitting technique, and many researchers have proposed various damper design methods. However, viscous and metallic-type dampers are more commonly used in practice, and studies on the design and assessment of friction dampers for seismic retrofit of structures are limited. To this end, this paper proposes a performance-based design method for friction dampers. The method, which combines the capacity-spectrum method with the codified damper design formulas, can improve the retrofitted building to a desired performance level. To validate the proposed performance-based design method, this paper employs the design procedure to determine the design parameters of a friction damper used in seismic retrofit of a seven-story reinforced concrete (RC) building. The seismic performance of the RC building with the friction damper is then assessed through the nonlinear time-history analysis using 11 spectrum-compatible ground motions. This paper adopts the Bouc-Wen-Baber-Noori model in the numerical model to accurately simulate the post-yield behavior of the RC columns in the first story. Under the DBE (design basis earthquake) intensity ground motions, the numerical results indicate an improvement in the seismic performance level of the RC building from the CP (collapse prevention) level to the LS (life safety) level, which meets the pre-set performance design objective. This validates the effectiveness of the proposed friction damper design method. Additionally, the numerical simulation also demonstrates that the friction damper achieves a reduction rate of 40% on the peak inter-story drift ratio of the first story and a reduction rate of 6% on the peak acceleration of the top floor.