期刊论文

Prediction model of creep coefficient of concrete filled steel tube

Cao, Guohui(cgfcivil@163.com)

中文

中南大学学报(自然科学版)

1672-7207

2016

47

2

628-634

10.11817/j.issn.1672-7207.2016.02.037

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）~~；

本校为第一且通讯机构

为研究钢管混凝土(CFST)徐变特性,在室内环境中对8根圆柱体试件进行870 d徐变测试。基于混凝土徐变的继效流动理论和多轴应力作用下的徐变理论,结合钢管混凝土轴心受压构件的受力特点,提出钢管混凝土徐变系数预测模型。研究结果表明:钢管混凝土徐变变形在100 d后趋于稳定,较普通混凝土稳定时刻变形时间提前,提出的预测模型能反映钢管混凝土的徐变机理,将钢管混凝土徐变变形分为可恢复滞后弹性变形、不可恢复的初始急流塑性变形和不可恢复的黏性流变3部分考虑,公式简洁,计算效果较好。

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 t...