（1 扬州市人民政府抗震人防办公室，扬州 225009；2 扬州大学建筑科学与工程学院， 扬州 225127）

［摘要］对6个桁架式钢骨混凝土梁柱节点试件进行了低周往复荷载试验，研究轴压比、预应力、节点核心区交叉斜腹杆等因素对试件滞回曲线、骨架曲线、刚度退化、耗能能力等性能的影响。试验结果表明：6个试件发生了梁端塑性破坏；桁架式钢骨混凝土梁柱节点破坏经历了初裂、通裂、极限、破坏4个特征阶段；轴压比对节点刚度退化及极限承载力有明显影响，轴压比越大，节点极限承载力越高，刚度退化越快；节点核心区交叉斜腹杆对试件承载能力的影响较大，含有交叉斜腹杆试件的耗能能力均好于未设置交叉斜腹杆的试件。

［关键词］桁架式钢骨混凝土结构； 框架节点； 轴压比； 预应力； 抗震性能； 斜腹杆

中图分类号：TU375-4文献标识码：A文章编号：1002-848X(2020)23-0086-06

Experimental research on the seismic performance of  truss-type steel reinforced concrete beam and column joint

XU Hong1, MENG Ruizhi2, CAO Dafu2, CAO Siqi2, GUAN Yiqing2

(1 Anti Earthquake Civil Air Defense Office of Yangzhou Municipal People′s Government, Yangzhou 225009,China; 2 College of Civil Science and Engineering, Yangzhou University, Yangzhou 225127, China)

Abstract:Low cyclic loading test of six truss-type steel reinforced concrete beam and column joint specimens was conducted, the effects of axial pressure ratio, pre-stressing force, cross diagonal web members in the core area of joint on the properties of hysteresis curve, skeleton curve, stiffness degradation, energy dissipation capacity and angle steel strain were studied. The test results show that six specimens underwent plastic failure of the beam ends; the failure of the  truss-type steel reinforced concrete beam and column joint has gone through four characteristic stages: initial crack, through crack, limit and failure. The axial pressure ratio has significant influence on the stiffness degradation and ultimate bearing capacity. With the increase of axial pressure ratio, the ultimate bearing capacity of the joint increases gradually, while the stiffness degradation decreases more fast; the cross web members in the core area of joint has evident influence on the bearing capacity of components, and the energy dissipation capacity of the components with cross diagonal web members are greater than those without cross diagonal web members.

Keywords:truss-type steel reinforced concrete structure; frame joint； axial pressure ratio； pre-stressing force; seismic performance； cross diagonal web member

*国家自然科学基金资助项目(51578478)。

作者简介：徐红，学士，高级工程师，Email:1057080710@qq.com；通信作者：曹大富，硕士，教授，Email: dfcao@yzu.edu.cn。