钢筋套筒挤压连接装配整体式梁柱中节点抗震性能试验研究

为研究钢筋套筒挤压连接的装配整体式叠合梁-预制柱中节点的抗震性能，进行了2个装配整体式中节点和1个现浇中节点试件的拟静力试验，观察其破坏现象，研究其滞回性能、承载力、变形能力及钢筋应变发展过程。结果表明：所设计的核心区剪切破坏和梁端弯曲破坏节点均实现了预期的破坏形态；核心区剪切破坏的装配整体式梁柱节点与现浇对比节点的破坏过程、裂缝分布基本一致，滞回曲线、承载力、刚度、变形、耗能等性能指标基本相同；核心区剪切破坏、梁端弯曲破坏的装配整体式梁柱中节点的承载力试验值与相应的规范公式计算值的比值分别为1.62、1.31，等效极限层间位移角分别为1/26和1/27；试验结束后，凿开混凝土发现套筒没有出现裂纹，钢筋在套筒内未见滑移，套筒挤压接头可有效传递钢筋拉、压力。

Experimental study on seismic behavior of assembled monolithic beam-column interior joints with rebar spliced by pressed sleeve

To study the seismic behavior of assembled monolithic beam-column interior joints with rebar spliced by pressed sleeve, quasi-static tests of two assembled monolithic interior joints and one cast-in-place interior joint were carried out. The crack and failure process of the specimens were observed. Further analysis was conducted to investigate the seismic behavior, such as the hysteretic characteristic, bearing capacity, deformation capacity, and rebar strain development process. The test results indicate that specimens with shear failure in the joint core area or flexural failure at the beam fixed end all fail in the expected failure modes. The failure process, crack patterns and major seismic behavior indexes of the assembled monolithic joint and the cast-in-place joint with the expected shear failure in the joint core area are basically consistent. The measured load-carrying capacity of the assembled monolithic joints, which fail in shear mode in the joint core area and flexural mode at the beam fixed end, respectively are 1.62, 1.31 times as large as the calculated capacity according to the formulas in the current design code. The equivalent ultimate inter-story drift ratios of the precast assembled monolithic joints are 1/26 and 1/27. After the test and removal of concrete, no cracks and rebar slippage were observed at the sleeve, indicating that the pressed sleeve splice can transfer the tensile and compressive force of rebars effectively.