高温后方中空夹层钢管混凝土柱滞回性能研究
The analysis of hysteretic behavior of concrete filled double-skin steel tubular column after high temperature

为研究高温后中空夹层钢管混凝土压弯构件的滞回性能,采用合理的本构关系,建立有限元模型,分析参数主要有轴压比、温度、内钢管屈服强度等,与试验结果比较,吻合较好。通过对高温后中空夹层钢管混凝土柱滞回性能的机理分析,结果表明:构件的耗能能力和位移延性系数均随着轴压比和温度的增加而减小;在加载的前期刚度退化较快,到后期刚度退化趋于平缓;构件的侧向承载力随着轴压比和温度的增加而减小,曾经历900 ℃高温后承载力下降50%以上;而内钢管的屈服强度对构件的刚度、延性、承载力等无显著影响。
In order to study the hysteretic behavior of concrete filled double skin steel tubular after high temperature, this paper choosed a reasonable constitutive model and established a reasonable finite model. There are many analysis parameters,such as the axial load ratio,the temperature and the yield strength of the inner steel tube and so on.Compared with the test,the results are in good agreement .The results showe that the energy dissipation capacity and the displacement ductility factor decrease with increasing temperature and axial load ratio.Stiffness degradation was faster at the early loading, but it slows down at last.The bearing capacity of the artifacts decreases with the axial compression and the temperature increasing.After 900℃ high temperature,the bearing capacity decreases more than 50% . But the yield strength of the inner steel tube have little effect on the stiffness,ductility and the bearing capacity