（1 河北工业大学土木与交通学院， 天津 300401； 2 河北曲港高速公路开发有限公司， 保定 071000）

［摘要］为改善钢筋混凝土结构框架节点的抗震性能，提出在混凝土框架边节点整体应用高韧性混凝土、节点核心区应用X配筋以及在核心区并向梁中部延伸1倍有效梁高范围内应用高韧性混凝土3种增强措施，通过拟静力试验对比研究3种方法增强的框架边节点的破坏特征、滞回曲线、刚度退化、耗能能力等抗震指标。研究结果表明：3种措施增强下，节点的抗震性能有所提高，节点的承载力与变形性能、耗能能力均有所提高。在节点核心区应用X配筋对于提高节点承载力、改善节点抗震性能效果显著。

［关键词］边节点； 高韧性混凝土； X配筋； 抗震性能

中图分类号：TU375-4文献标识码：A文章编号：1002-848X(2019)08-0022-05

Experimental study on seismic behavior of concrete frame exterior joints reinforced by high-toughness concrete or X-shaped reinforcement

Li Yanyan1， Li Mingyang1， Mo Ling2,  Zhang Weitian1

（1 School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China; 2 Hebei Qugang Expressway Development Co., Ltd., Baoding 071000, China）

Abstract:To improve the seismic behavior of reinforced concrete frame joints, three kinds of reinforcing measures for concrete frame exterior joints were put forward, those are, the application of high-toughness concrete as a whole, the application of X-shaped reinforcement in the core area, and the application of high-toughness concrete in the core area and within the range of 1-time effective beam height extending to the middle of the beam. The seismic behavior indexes including failure characteristic, hysteretic curve, stiffness degradation, energy dissipation of the frame exterior joints reinforced by three methods were compared through quasi-static tests. The results show that the seismic behavior of the joints reinforced by  three reinforced specimens is improved, and the capacity of bearing capacity, deformation and energy dissipation is increased. The application of X-shaped reinforcement in the core of the joint is more effective in improving the bearing capacity and the seismic behavior of the joints.

Keywords:exterior joints; high-toughness concrete; X-shaped reinforcement; seismic behavior

*河北省自然科学基金项目（E2018202290，E2017202278），河北省交通运输厅科技计划项目（QG2018-2）。

作者简介：李艳艳，博士，教授，Email：nicole_820@163.com。