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Review and evaluation of reinforced concrete eccentric beam-to- column connections

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Review and evaluation of reinforced concrete eccentric beam-to- column connections

主管單位:內政部建築研究所

計畫主持人:李宏仁/國立雲林科技大學營建工程系 協同主持人:林克強/國家地震工程研究中心研究員 計畫參與人:紀凱甯、林明志

國內外絕大多數的梁柱接頭實驗為無偏心之梁柱接合,偏心梁柱接頭之實驗成果非常稀少,

而且幾乎都是梁連續貫穿接頭的情況,我國建築工程常用長方形柱斷面且兩長邊各接一偏心梁且 梁不連續,形成錯位偏心梁柱接合,此類接頭之實驗數據相當罕見,但實務上確有需要。現行混 凝土結構設計規範和新版規範草案並未涵蓋此類偏心接頭,為確保建築結構安全,本研究檢討此 類接頭之耐震抗剪強度,藉由大型結構實驗探討鋼筋混凝土柱接不同偏心距之梁,其接頭剪力強 度之衰減程度,補足過往實驗經驗不足之處,俾利規範審議時參考引用,讓設計及施工單位有所 依循,確保建築結構耐震性能及國人生命財產安全。

經過實驗比對,現行規範之接頭抗剪強度計算方式不恰當。新版規範之接頭抗剪強度計算公式 較為合理,適用於梁連續或不連續。當兩對面接頭有效寬度計算結果不一致時,建議取兩側之較 小值是比較保守的,實驗結果顯示,錯位偏心接頭最大強度雖然不亞於正交接頭,但是其強度衰 減較為劇烈,設計時宜保守處理,緊密箍筋不可或缺。

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