(1 扬州市建筑设计研究院有限公司, 扬州 225007; 2 扬州大学建筑科学与工程学院, 扬州 225127)

摘要: 为研究轴压比以及配钢率对桁架式钢骨混凝土框架节点受剪性能的影响,制作了 5 个核心区剪切破坏的桁架式钢骨混凝土框架中节点,研究不同轴压比和用钢量对节点极限承载力、抗震性能及破坏形态的影响. 基于有限元软件 ABAQUS,对 5 个桁架式钢骨混凝土框架节点模型开展了力学性能分析. 结果表明:所有构件的破坏形态全部为核心区剪切破坏;提高轴压比对于构件的极限承载力有积极作用,但会使其耗能能力和延性降低;节点核心区配置交叉斜腹杆角钢可提高构件的极限承载能力以及抗震性能;通过分析参数可得,提高轴压比以及混凝土抗压强度、增加核心区交叉斜腹杆的尺寸并且提高其屈服强度都会提高节点的极限承载力;推导了桁架式钢骨混凝土框架节点的抗剪承载力计算公式,经验证计算值与实测值和模拟值相近,可为工程设计提供理论参考.关键词: 桁架式钢骨混凝土; 框架中节点; 受剪性能; 抗剪承载力计算公式

中图分类号:TU375. 4 文献标志码:A 文章编号:1002-848X(2023)08-0105-08

DOI:10. 19701 / j. jzjg. LS210132

Experimental study on shear performance of truss steel reinforced concrete frame joints

YANG Xiaofeng1, LIU Yifei2, GE Wenjie2, QIAN Rui2, CAO Dafu2

(1 Yangzhou Architectural Design and Research Institute Co. , Ltd. , Yangzhou 225007, China; 2 Collegeof Civil Science and Engineering, Yangzhou University, Yangzhou 225127, China)

Abstract: In order to study the influence of axial compression ratio and steel ratio on shear properties of truss steelreinforced concrete ( RC) frame joints, five truss steel RC frame joints occurred core shear failure were made. Theinfluence of different axial compression ratio and steel content on ultimate bearing capacity, seismic performance and failureprocess of the joints were studied. Based on the finite element software ABAQUS, the mechanical properties of truss steelRC frame joints were analyzed. The results show that all specimens occurred core shear failure. With the increase of axialcompression ratio, the ultimate bearing capacity increases, but the energy dissipation capacity and ductility decrease. Theenhancement of steel content in the core zone of joints can improve the ultimate bearing capacity of components, and theseismic performance also increases accordingly. The results of parameter analysis shows that the bearing capacity increaseswith the increase of axial compression ratio, compressive strength of concrete, size of diagonal web members in core areaand yield strength of steel. The calculation formula for shear bearing capacity of truss steel RC frame joints is alsoproposed. The predicted values are in good agreement with the tested and simulated values, which can be taken astheoretical reference for engineering design.

Keywords: truss steel reinforced concrete; frame inner joints; shear performance; calculation formula for shearbearing capacity

∗国家自然科学基金资助项目(51578478,51678514),江苏省自然科学基金面上项目(BK20201436),中国博士后基金面上项目(2018M642335),扬州市-扬州大学市校合作共建科技创新平台新型装配式建筑结构重点实验室开放课题(YZZP202201),江苏高校“青蓝工程”资助项目(苏教师函[2020]10 号).

第一作者:杨晓峰,学士,高级工程师,主要从事民用建筑结构设计,Email:594023290@ qq. com.

[引用本文] 杨晓峰,刘逸飞,葛文杰,等. 桁架式钢骨混凝土框架节点受剪性能试验研究[ J]. 建筑结构,2023,53(8):105-112,153. YANG Xiaofeng,LIU Yifei,GE Wenjie,et al. Experimental study on the shear performance of trusssteel reinforced concrete frame joints[J]. Building Structure,2023,53(8):105-112,153.