京基金融中心巨型钢管混凝土柱试验研究

Experiment study on giant concrete filled steel tube columns of Kingkey Center

京基金融中心采用的巨型钢管混凝土柱,截面尺寸巨大、形式复杂,其受力性能、截面刚度和承载力计算方法与普通钢管混凝土柱不同。对结构底部角柱进行了缩尺模型的低周往复荷载试验与有限元分析,研究了其承载力、刚度、延性和滞回耗能能力以及破坏特征。试验结果表明:在竖向荷载作用下,钢管与混凝土、钢筋能够协同工作;在压弯往复荷载作用下,柱的耗能能力较强,延性较好。根据研究结果,对巨型钢管混凝土柱刚度和承载力的设计计算方法提出了建议。

Giant concrete filled steel tube（CFST）columns with huge sections and complex shapes were adopted in Kingkey Center.Mechanic properties,calculation methods of section stiffness and bearing capacity might be different from ordinary CFST columns.Experiment study and finite element analysis were carried out on reduced scale model of huge CFST columns.The bearing capacity,stiffness,ductility,hysteretic energy dissipating capacity and failure pattern of columns were studied.The results show that steel tube,concrete and steel bars are working together under vertical load.Under axial and cyclic load,the columns perform strong energy dissipating capacity and ductility.Based on the research,suggestions on the design method of stiffness and bearing capacity of giant CFST columns were proposed.