中南大学学报（自然科学版）Issue(2)：628-634,7.DOI:10.11817/j.issn.1672-7207.2016.02.037
钢管混凝土徐变系数预测模型
Prediction model of creep coefficient of concrete filled steel tube
摘要
Abstract
To study the creep properties of concrete filled steel tube (CFST), the long-term tests of the shrinkage and creep with 8 concrete circular columns specimen for more than 870 d in indoor environment were conducted. Based on the elastic continuation and plastic flow theory for concrete creep, and the creep theory of concrete under multi axial stresses, a prediction model of creep coefficient in CFST was put forward by considering the mechanical characteristics of axially compressed CFST members. The results show that the creep deformation of CFST tends to be stable after 100 d of loading, and thus its stable moment is earlier than that of normal concrete. The prediction model reflects creep mechanism of CFST, which divides creep deformation into three parts: recoverable lag elastic deformation, the initial irreversible rapids plastic deformation and unrecoverable viscous flow. The formula proposed in this paper is simple and has an effective calculation effect.关键词
钢管混凝土(CFST)/收缩徐变/计算模型/理论分析Key words
concrete filled steel tube (CFST)/shrinkage and creep/calculation model/theoretical analysis分类
建筑与水利引用本文复制引用
曹国辉,张旺,胡佳星,张锴,张胜..钢管混凝土徐变系数预测模型[J].中南大学学报（自然科学版）,2016,(2):628-634,7.基金项目
国家自然科学基金资助项目(51551801)；湖南省自然科学基金资助项目(14JJ4062)(Project (51551801) supported by the National Natural Science Foundation of China （51551801）
Project (14JJ4062) supported by the Natural Science Foundation of Hunan Province) （14JJ4062）
