T形柱边框架节点套筒灌浆连接抗震分析

对预制柱连接进行优化，套筒灌浆用于角纵筋连接，其余纵筋绑扎搭接，设计并制作了一个T形柱边框架梁柱节点试件。采用试验和有限元计算，研究梁柱节点在水平地震作用下破坏过程、承载力与变形、延性、刚度与耗能能力，并对轴压比参数进行计算分析。结果表明：优化后梁柱节点呈梁端受弯破坏，节点和预制柱固端未出现明显裂缝；荷载位移骨架曲线表现出较好的塑性变形能力，延性系数接近5；滞回环面积饱满，累积耗能约15 kJ，等效黏滞系数在0.04~0.24之间；随轴压比增加，节点受压损伤区域扩大，延性明显降低。后浇整体式T形柱边框架节点整体性良好，抗震性能较强，弹簧单元用于竖向预制后浇界面黏结作用的简化，数值计算结果与试验表征相符。

Seismic Analysis of T-shaped Column Exterior Frame Joint Splicing by Grout-filled Coupling Sleeve

For optimizing the connection of prefabricated columns, sleeve grouting was used for the connection of corner longitudinal bars, and the rest of the longitudinal bars were tied and overlapped. A scaled specimen of T-shaped column exterior frame joint was designed and fabricated. Experiment and finite element analysis were used to study the failure process, bearing capacity and deformation, ductility, stiffness and energy dissipation capacity of beam-column joints under horizontal earthquake. The axial pressure ratio parameters were calculated and analyzed. The results show that the beam-column joint is subjected to bending damage at the beam end after optimization, and no obvious cracks appear at the joint and the fixed end of the precast column; The load-displacement skeleton curve shows good plastic deformation ability, and the ductility coefficient is close to 5; Hysteresis loop is full, and the cumulative energy consumption reaches about 15 kJ. The equivalent viscosity coefficient is between 0.04 and 0.24; As the axial compression ratio increases, the joint is damaged by compression expand, and the ductility is significantly reduced. The cast-in-situ monolithic T-shaped column exterior frame joint has good integrity and strong seismic performance. The spring elements are used to simplify the adhesion of the vertical precast post-casting interface. The numerical calculation results are consistent with the experiment characterizations.