高层建筑结构边节点抗震性能研究

通过7根留有施工缝的高层建筑结构边节点的低周反复抗震性能试验,研究了轴压比、节点核心区的混凝土强度等级、柱中混凝土在梁中的延伸长度等对梁柱边节点抗震性能的影响,对构件的破坏特征、承载能力、延性性能、滞回曲线和骨架曲线进行了对比分析。试验结果表明:所有试验构件均为梁端受弯破坏;柱中混凝土在梁中的延伸长度对骨架曲线的形态、屈服荷载和最大荷载都没有显著影响;但是延伸长度对节点的延性性能是有影响的,延伸长度为0.5h(h为梁高)的边节点构件的位移延性系数小于延伸长度为1.0h和1.5h的构件。

Research on Seismic Performance of Exterior Joints in Tall-building Structure

Based on low-cycle loading test for 7 exterior joints of a tall-building structure with construction joint, the influence of parameters, such as axial compression ratio, concrete strength grade in exterior joints core region and extending length of column's high-strength concrete into beams etc, on seismic performance of beam-column exterior joints was experimentally studied. The failure characteristics, bearing capacity, displacement ductility, hysteretic curve and skeleton curve of components were analyzed and compared. Experimental results show that all beam-column exterior joints damage at beam ends due to bending. The extending length of column's high-strength concrete into beams has no significant effect on yield load, peak load and skeleton curve. While the extending length presents effect on displacement ductility. When the extending length is 0.5h, the displacement ductility ratio of exterior joints is less than that of extending length 1.0h and 1.5h, respectively.