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通过对3个自密实混凝土加固框架中节点和1个未加固的对比框架节点进行二次受力下自密实混凝土框架节点的拟静力试验,研究不同初始受力对自密实混凝土加固节点抗震性能的影响。柱轴压比为0.3,梁端初始力为0、0.25、0.50倍的被加固试件预估梁端开裂荷载。通过对试件破坏过程、新老钢筋应变、荷载位移滞回曲线等试验结果的分析得出:采用自密实混凝土增大截面法加固框架节点,新老混凝土的协同工作性能良好;考虑初始受力的影响,加固节点的极限荷载、极限位移、梁端位移延性系数等都会降低,且降低的程度随梁端初始荷载的增大而增大,在加固设计中应予以考虑。
The quasi-static tests of self-compacting concrete frame joints subjected to secondary loading were carried out on three self-compacting concrete reinforced frame joints and one unreinforced reinforced concrete frame joint to study the influence of different initial load on the seismic performance of self-compacting concrete reinforced joints Impact. Column axial compression ratio of 0.3, the initial beam end of the 0,0.25,0.50 times the strength of the specimen to be estimated to strengthen the beam end cracking load. Through the analysis of the failure process of the specimen, the strain of old and new steel bars and the hysteretic curve of load displacement, the results show that the new-old concrete has good cooperative working performance when the frame joints are strengthened by increasing the section method of self-compacting concrete. The ultimate load, the ultimate displacement and the displacement ductility coefficient at the end of the beam will decrease, and the degree of the decrease will increase with the increase of the initial load at the beam end, which should be considered in the reinforcement design.