圆钢管混凝土轴心受压构件徐变分析的比较

在对钢管混凝土构件徐变研究进行回顾的基础上,应用考虑多轴受压状态下的混凝土徐变理论建立圆钢管混凝土轴心受压构件徐变模型,分别采用继效流动理论和龄期调整有效模量法对构件的徐变进行分析,通过迭代计算得到基于2种理论方法的圆钢管混凝土轴心受压构件的徐变,并与试验所得的回归公式计算结果进行比较。通过对比,指出了2种理论的差异性。结果表明:在钢管混凝土轴心受压构件的徐变计算中,继效流动理论具有较高的精度。

Creep Analysis Comparison of Circular Axially Compressed Concrete-filled Steel Tubular Members

Based on reviewing the state-of-art of the studies on creep of concrete-filled steel tubular(CFST) members,a model was built to calculate creep of circular axially compressed CFST members considering creep theory about the situation of concrete under multi-axial stresses.Elastic continuation and plastic flow theory and age adjusted effective modulus method of concrete creep were used for the creep analysis of the members separately.The creeps of circular axially compressed CFST members were calculated based on two theoretical methods,and the results were compared with the result calculated by regression equation obtained from tests.The difference of two theories was pointed out by comparison and analysis.Results show that elastic continuation and plastic flow theory has higher accuracy in the creep calculation of axially compressed CFST members.