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 CFS...