自密实混凝土加固框架节点承载力

Bearing capacity of frame joints strengthened by self-compacting concrete

对5个自密实混凝土加固框架中节点、1个未加固的对比框架节点和1个整浇的对比框架节点进行拟静力试验。考虑框架节点梁端初始受力和轴压比2个参数对加固节点承载力的影响,提出了节点混凝土承载力折减系数;同时参考现行的结构设计规范,建立考虑初始受力和轴压比的自密实混凝土加固框架节点承载力计算公式;计算结果与试验结果吻合较好,可为自密实混凝土加固框架节点加固设计提供理论参考。

A series of quasi-static tests on five frame joints strengthened by self-compacting concrete,one unstrengthened joint and one integral casting joint for comparison were conducted.Considering the influence of the initial force and axial load ratio on the bearing capacity of strengthened frame joints, the bearing capacity reduction coefficient of concrete was proposed.Based on current concrete design code, the bearing capacity design formulas considering initial force and axial load ratio of the strengthened frame joints by self-compacting concrete were given.The calculated results matched well with the experimental results,which can provide a theoretical reference for the strengthening design of the frame joint by self-compacting concrete.