局部采用高延性混凝土装配式框架梁-柱节点抗震性能试验研究

为了提高装配式梁柱节点的变形及耗能能力，同时简化节点核心区构造避免节点核心区钢筋拥挤而导致的施工困难，在节点局部采用高延性混凝土（HDC）代替普通混凝土。考虑轴压比和节点核心区配箍率的影响，进行了5个局部采用HDC的装配式梁柱节点和1个钢筋混凝土（RC）装配式梁柱节点的拟静力试验，分析了其破坏形态、滞回特性、变形能力、刚度退化、耗能能力和节点核心区剪切变形。结果表明:节点核心区采用HDC，破坏由节点核心区转移到梁端，实现了强节点设计原则，有效提高了框架节点的变形能力和耗能能力；节点核心区和梁端均采用HDC，梁柱节点的破坏转移到柱端，需对柱端适当加强；节点核心区采用HDC的装配式梁柱节点，可以减少甚至免去箍筋的用量。

EXPERIMENTAL STUDY ON ASEISMIC BEHAVIOR OF LOCALLY USED HDC ASSEMBLED FRAME BEAM-COLUMN JOINTS

In order to improve the deformation and energy dissipation capacity of fabricated beam-column joints and avoid the construction difficulties caused by crowded steel bars, high ductile fiber reinforced concrete(HDC) is used as the core material of beam-column joints. Considering the influence of axial compression ratio and stirrup ratio, 5 fabricated beam-column joints partly adopted HDC and 1 reinforced concrete(RC) beam-column joint were tested. The failure patterns, hysteretic characteristics, deformation capacity, stiffness degradation, energy dissipation capacity and shear deformation of the joint core area were analyzed. The results are as follow. First, failure position changed from node core area to beam end after adopted HDC in node core area. The design principle of a strong node is realized, and the deformation ability and energy dissipation capacity of frame nodes are effectively improved. Second, column ends should be strengthened because the failure position transferred to the end of column adopted HDC in the node area and beam end. Third, the amount of stirrups can be reduced when HDC is used in node core area.