考虑环境温度的钢管混凝土轴压承载力试验与计算方法研究

Study on test and calculation method of axial compression bearing capacity of concrete filled steel tube considering ambient temperature

为了研究环境温度对钢管混凝土轴压承载力的影响特征。开展不同环境温度下钢管混凝土短柱轴压承载力试验,探究环境温度对钢管混凝土轴压承载力的影响规律;基于极限平衡法,推导考虑环境温度影响的钢管混凝土轴压承载力理论计算公式,并通过试验验证其精确性。研究结果表明:温度变化对钢管混凝土柱承载力影响显著,环境温度由20℃降至-40℃时,试件承载力最大提升了34.3%;所提考虑环境温度影响的钢管混凝土轴压承载力理论公式计算值与试验值相对误差小于10%,具有较高的准确性。研究结果可为高寒大温差地区钢管约束混凝土结构设计提供理论参考。

In order to study the influence of ambient temperature on the axial compression bearing capacity of concrete filled steel tube(CFST),the axial compression bearing capacity test of CFST short columns under different ambient temperatures was carried out to explore the influence of ambient temperature on the axial compression bearing capacity of CFST.Based on the limit equilibrium method,the theoretical calculation formula of axial compression bearing capacity of CFST considering the influence of ambient temperature was derived,and its accuracy was verified by experiments.The results show that the temperature change has significant influence on the bearing capacity of CFST columns.When the temperature decreases from 20℃to-40℃,the bearing capacity of the specimen increases by 34.3%at most.The relative error between the calculated value of theoretical formula and the experimental value about the axial compression bearing capacity of CFST considering the influence of ambient temperature is less than 10%,which has high accuracy.The research results can provide a theoretical basis for the design of steel tube confined concrete structures in alpine regions with large temperature difference.