(北京航空航天大学土木工程系，北京 100083)

［摘要］通过三组共6个钢筋混凝土L形截面柱的低周反复加载试验，研究了不同水平加载角的L形柱的破坏特征、滞回曲线、耗能及变形性能。试验结果表明加载角对L形柱的承载力及延性影响较大。在此基础上，利用自编的反复加载截面非线性分析程序，对试件进行了弯矩-曲率滞回曲线的计算分析，参考有限单元法中的平面等参元积分方法，把笛卡尔坐标系下的任意形状截面变换为自然坐标系下的规则形状，用高斯积分法计算截面内力。程序考虑了钢筋混凝土的粘结滑移对构件滞回性能的影响。分析结果与试验结果吻合较好。

［关键词］L形柱；抗震性能；反复加载；滞回曲线；非线性分析；粘结滑移

Experimental study on RC columns of L shaped section under cyclic load

Diao 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 correspo

nding 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

*国家自然科学基金（50678016）和北京市自然科学基金（8052014）资助。

作者简介：刁波，教授，博导，Email:diaobo@buaa.edu.cn。

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