（1 扬州市市政建设处， 扬州 225002； 2 扬州大学建筑科学与工程学院， 扬州 225127；3 桥梁结构安全控制湖南省工程实验室（长沙理工大学）， 长沙 410015；  4 扬州大学广陵学院， 扬州 225127）

［摘要］通过3个预应力及1个非预应力型钢混凝土梁-角钢混凝土柱节点试件的低周往复荷载试验，研究了此类梁柱节点的破坏形态、滞回曲线、耗能能力、刚度退化、变形恢复性能和延性，分析了轴压比和预应力度对节点滞回性能的影响。结果表明：达到水平峰值荷载前，所有节点试件均首先发生梁端弯曲破坏，达到峰值荷载时，节点核心区混凝土被斜向压碎，发生剪切破坏，最终呈现出混合破坏形态；所有节点试件的水平荷载-位移滞回曲线均呈现出一定的捏缩；通过提高预应力度可以提高此类节点核心区的抗剪承载力，但降低了剪切变形的延性，过高的轴压比会一定程度上降低节点核心区的抗剪承载力以及剪切变形的延性。此外，建议设置剪力栓加强角钢与混凝土保护层的粘结能力。

［关键词］型钢混凝土梁；角钢混凝土柱；节点；预应力；滞回性能

中图分类号：TU398-9文献标识码：A文章编号：1002-848X(2021)04-0101-08

Experimental study on hysteretic behavior of prestressed steel reinforced concrete beam-angle steel concrete column frame joints

CHEN Xiaofei1,2, WANG Kun2,3, LUO Huihui4, LI Congqi2, GU Mingjun2, ZHA Zhiyuan2

(1 Yangzhou Municipal Construction Office, Yangzhou 225002, China;2 College of Civil Science and Engineering, Yangzhou University, Yangzhou 225127, China;3 Hunan Province Engineering Laboratory of Bridge Structure (CSUST), Changsha 410015, China;4 College of Guangling, Yangzhou University, Yangzhou 225127, China)

Abstract:Through the low cyclic load test of three prestressed and one non-prestressed steel reinforced concrete beam-angle steel concrete column frame joint specimens, the failure modes, hysteretic curves, energy dissipation capacity, stiffness degradation, deformation recovery performance and ductility were investigated, and influence of axial compression ratios and prestressing levels on hysteretic behavior of joints were analyzed. The results show that all joint specimens finally behaved mixed failure mode, in which flexural failure at beam ends before peak loads and shear failure in the joint core area with diagonally concrete crushing at peak loads are observed. And  the lateral load-displacement hysteretic curves present a certain  of pinch of all joints. With the increasing of prestressing levels, the shear capacities of the core area of such joints can be improved  the ductility  of shear deformation is decreased. An excessively high axial compression ratio will reduce the shear capacities of the core area of the joints and the ductility of shear deformation to a certain extent. In addition, it is recommended to set up shear bolts to strengthen the bonding ability between the angle steel and the concrete protective layer.

Keywords:steel reinforced concrete beam;angle steel concrete column;joint;prestressing;hysteretic behavior

*长沙理工大学桥梁结构安全控制湖南省工程实验室开放基金资助项目(16KD01)，江苏省“六大人才高峰”人才项目(2017-JZ-038)，扬州大学优秀青年骨干教师人才项目（2016），国家自然科学基金项目(51508495, 51578478)。

作者简介：陈晓飞，硕士，高级工程师，Email: 38140823@qq.com；通信作者：王琨，博士，副教授，Email: wangkun@yzu.edu.cn。