端部带肋方钢管混凝土柱抗震试验研究

为进一步提高方钢管混凝土柱的承载能力和延性，提出了一种新的方钢管混凝土柱构造方案，即在方钢管柱的端部设置加劲肋，并设计制作了3根端部带肋方钢管混凝土柱，进行了拟静力试验，比较、分析了试件在水平低周往复荷载作用下的承载能力、滞回曲线、骨架曲线以及位移延性等抗震性能指标. 研究结果表明：相对于普通方钢管混凝土柱，3根端部带肋方钢管混凝土柱的滞回曲线更为饱满, 骨架曲线的下降段更为平缓，柱极限位移明显提高，分别提高了44.4%、65.3%、29.3%，位移延性系数明显增大，分别增大了270%、51.3%、6.7%, 表现出了更良好的延性与耗能能力，抗震性能有比较明显的改善.
In order to improve the bearing capacity and ductility of square concrete-filled steel tube (CFST) column，this paper proposed a new structure scheme，adding ribs at the end of CFST column.Three CFST columns with end ribs were designed and produced.Pseudo static test was conducted，and seismic behaviors including the bearing capacity，hysteresis curves，skeleton curves and displacement ductility were obtained.Compared with the conventional CFT columns，experimental results indicated that the hysteretic loop curve of the test specimens dissipated large energy，and the decline of the skeleton curve was not significant.The ultimate displacement increased obviously by 44.4%，65.3% and 29.3%，respectively.The ductility increased by 27.0%，51.3% and 6.7%，respectively.The CFST columns with ribs exhibited good energy dissipation capacity and their seismic performance was significantly improved with larger ductility.