双槽钢组合截面悬臂构件在往复弯曲下滞回性能研究*
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（西安建筑科技大学土木工程学院， 西安 710055）
［摘要］为研究双槽钢组合截面悬臂构件的滞回性能，建立了8个双槽钢组合截面悬臂构件在往复弯曲作用下的有限元模型。通过改变填板间距、侧向支撑间距、腹板高厚比和设置加劲肋等参数，得到不同参数下模型的滞回曲线、骨架曲线、各阶段的弯矩和转角值及抗震性能指标，分析了模型的破坏特征、延性、耗能能力、承载能力及刚度退化等力学性能。结果表明：双槽钢组合截面悬臂构件有良好的滞回性能；填板间距的减小，可以有效防止单肢槽钢的弯扭失稳；腹板高厚比减小，可提高模型的承载力和初始刚度；设置加劲肋可限制腹板和翼缘的局部屈曲，提高了模型的耗能能力和刚度。［关键词］双槽钢组合截面悬臂构件; 往复弯曲; 滞回性能; 有限元中图分类号：TU391 文献标识码：A 文章编号：1002-848X(2016)07-0056-08
Hysteretic behavior study of cantilever member with double-channel steel composite section under reversed cyclic bendingRan Hongdong, Liang Wenlong(School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055,China)Abstract: To study the hysteretic behavior of cantilever member with double-channel steel composite section, finite element models of 8 cantilever members with double-channel steel composite sections were established under reversed cyclic bending. By changing the parameters as filling plate spacing, lateral support spacing, web depth-thickness ratio and set of stiffener, results of the models with different parameters were obtained including hysteretic curve, skeleton curve, the moment and rotation values of each stage and seismic performance index values. In addition, the mechanical properties of models were analyzed as the damage features, ductility, energy dissipation capacity, carrying capacity and stiffness degradation. The results show that the cantilever member with double-channel steel composite section has good hysteretic behavior; reduction of filling plate spacing can effectively prevent flexural torsional buckling of single limb channel steel; decrease of web depth-thickness ratio can improve the bearing capacity and initial stiffness of the model; set of stiffener can limit local buckling of flange and web, which improves the energy dissipation capacity and stiffness of the model.Keywords: cantilever member with double-channel steel composite section; reversed cyclic bending; hysteretic behavior; finite element
*国家自然科学基金项目（51208412），住房与城乡建设部科研项目（2013-K2-019）,陕西省教育厅重点实验室项目（15JS049）。作者简介：冉红东,副教授,硕士生导师，Email:ranhd@163.com。
