鋼筋混凝土L形柱反復加載試驗研究
刁波，羅佑新，高常忠，李昊
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(北京航空航天大學土木工程系，北京 100083)［摘要］通過三組共6個鋼筋混凝土L形截面柱的低周反復加載試驗，研究了不同水平加載角的L形柱的破壞特征、滯回曲線、耗能及變形性能。試驗結果表明加載角對L形柱的承載力及延性影響較大。在此基礎上，利用自編的反復加載截面非線性分析程序，對試件進行了彎矩-曲率滯回曲線的計算分析，參考有限單元法中的平面等參元積分方法，把笛卡爾坐標系下的任意形狀截面變換為自然坐標系下的規(guī)則形狀，用高斯積分法計算截面內力。程序考慮了鋼筋混凝土的粘結滑移對構件滯回性能的影響。分析結果與試驗結果吻合較好。［關鍵詞］L形柱；抗震性能；反復加載；滯回曲線；非線性分析；粘結滑移Experimental study on RC columns of L shaped section under cyclic loadDiao Bo, Luo Youxin, Gao Changzhong, Li Hao(Department of Civil Engineering, Beihang University, Beijing 100083, China)Abstract:An experimental research on 6 RC columns of L shaped section divided into three groups under cyclic load is achieved. The process of damage, hysteretic curve and the ability of distortion and energy dissipation under angled cyclic load are studied. The research shows that the angle of load has large effect on the bearing capacity and ductility of columns. On the basis of the experimental results, a compute program is compiled. Through coordinate transformation corresponding to the isoparametric element theory, calculation of an abnormal element in Cartesian coordinate system is converted to a regular element in natural coordinate system, procedure of carrying out Gauss integral to obtain the cross endogen force is proposed. And bond-slip behavior between steel bar and concrete is considered. The calculation result coincides with the experimental result well.Keywords:L shaped section columns; seismic performance; cyclic load; hysteretic curve; nonlinear analysis; bond-slip behavior*國家自然科學基金（50678016）和北京市自然科學基金（8052014）資助。作者簡介：刁波，教授，博導，Email:diaobo@buaa.edu.cn。參考文獻［1］鞏長江，等.L形截面鋼筋混凝土框架柱受剪性能的試驗研究［J］.建筑結構,1999，29(1):31-34.［2］李硯波，陳云霞，等.鋼筋混凝土雙向拉彎構件正截面承載力計算研究［J］. 建筑結構，1999,29(1):47-48.［3］姬守中，江歡成，等.雙軸反復荷載作用下鋼筋混凝土空間框架結構滯回全過程分析［J］.力學季刊，2002,23(4):455-462.［4］YE YINGHUA, DIAO BO. Nonlinear analysis of concrete structures ［M］. Harbin: Publishing House of Harbin Institute of Technology, 1996.［5］葉英華, 焦俊婷. 雙向偏壓鋼筋混凝土異形構件截面分析的簡化方法［J］.建筑結構學報,2004, 25(6): 83-87.［6］HYO GYOUNG KWAK, JIN KOOK KIM. Implementation of bond-slip effect in analyses of RC frames under cyclic loads using layered section method［J］. Engineering Structures，2006，28：1715-172.［7］朱伯龍，董振祥.鋼筋混凝土結構非線性有限元分析［M］. 上海: 同濟大學出版社,1985.
