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中文標題: 圍束補強鋼筋混凝土柱之軸向行為研究
英文標題: Axial Loading Capacity of Retrofitted Full-Scale Rectangular RC Columns
編號: NCREE-11-025
語言: 中文
編輯:
媒體型式: 紙本
作者:
林敏郎   吳穎涵   林至聰   陳沛清   
中文摘要: 台灣地區地震頻繁,建築結構因地震而毀損崩塌時由所聞,因此現今
國內建築規範要求新建建築之RC 柱結構內部需配置高量橫向圍束鋼筋使
結構具備足夠耐震性;老舊RC 建築則須經由耐震補強以確保建築結構於震
災發生時能發揮足量韌性與消能能力;面外包覆鋼板或複合材料(FRP)具備
施工簡易、快速,且不影響原結構動線規劃與外貌等優點,為目前廣泛應
用之結構補強方法;過去研究顯示,面外包覆結構補強工法對矩形柱結構
之結構補強效果低於圓形柱結構,原因在於面外包覆無法提供矩形柱之柱
面有效圍束,且角隅區易發生應力集中現象而造成補強材料損傷,同時,
過去研究顯示矩形柱補強時搭配錨定機制可改善上述缺失。
本文探討碳纖維材料面外包覆補強矩形柱,藉由所研發之纖維錨栓
(FRP Anchor)改善碳纖維面外包覆補強矩形柱效果,由實尺寸RC 柱單向度
軸壓試驗量化FRP Anchor 對RC 柱圍束補強之功效;對鋼板材料面外包覆
補強,則嘗試以化學錨栓(Adhesive Anchor)、八角形包覆等方法進行補強。
試驗規劃不同圍束量與錨栓用量之補強柱試體,結果顯示,FRP Anchor 可
提供RC 柱有效圍束效果,改善碳纖維矩形包覆之缺失、延緩碳纖維破壞時
間;對柱軸向壓力強度而言,圍束補強可有效提升其強度,但設計更高量
之圍束補強,對強度提升之效果也隨之減少;對軸向壓縮應變而言,則可
有效予極限應變量提升。鋼板補強試體在RC 柱定義強度衰減至70%為破
壞後,仍能持續維持一定量之抗壓強度,發展較大之塑性變形,由破壞模
式觀察,3mm 矩形鋼板補強破壞模式為柱邊面外鼓出造成焊道開裂,6mm
矩形鋼板補強則為角隅開裂控制其破壞行為,而3mm 八角形鋼板包覆表現
出最佳之強度與變形能力。本文數值分析藉由量化錨栓之圍束強度,參考
Mander 圍束混凝土理論之有效圍束效果,利用數值模擬RC 柱受軸向壓力
之行為與反應,得到良好之分析結果。
英文摘要: The performance of RC columns subjected to axial force is relative to the confinement. CFRP wrapping, a generally adopted retrofit method, was proved not to effectively provide confining force due to the bulging effect on the column face. Therefore, this paper is focused on the performance of the retrofitted full-scale rectangular RC columns using different retrofit schemes including the proposed CFRP wrapping conjugated with FRP Anchors method. A total of eleven rectangular RC columns with low transverse reinforcement ratio were constructed. Among them, one was tested as benchmark; one was purposely constructed with larger transverse reinforcement ratio; five were retrofitted by using CFRP wrapping and FRP Anchors; and the other four were retrofitted by using different shapes of steel jacketing alone or with adhesive anchors. All the specimens were subjected to monotonic incremental axial force until failure occurred. Experimental results demonstrated that the ductility of the specimens retrofitted by using CFRP wrapping with FRP Anchors was significantly improved compared with those retrofitted by using only CFRP wrapping. On the other hand, the specimen with octagonal steel jacketing performed better than all other specimens not only on ductility but also on strength. Finally, a novel numerical model considering the contribution of the retrofit material will be proposed and validated in the future.
關鍵字: RC 柱、耐震補強、側向圍束、碳纖維包覆、纖維錨栓、鋼板補強
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