期刊论文

中文

建筑结构学报

1000-6869

2015

36

6

151-157

10.14006/j.jzjgxb.2015.06.019

湖南省自然科学基金项目(14JJ4062) 湖南省高等学校研究重点项目(12A027)

本校为第一机构

在室内环境中对8个混凝土圆柱体试件进行长达800余天收缩徐变测试,对比了混凝土、钢管混凝土、钢管膨胀混凝土圆柱体的收缩徐变时程规律,得到了钢管膨胀混凝土收缩徐变特性。试验结果表明:钢管膨胀混凝土收缩应变较小,受膨胀剂的影响,初期收缩变形基本为0;钢管膨胀混凝土徐变变形在100 d内变化较大,100 d后基本处于平稳状态,与未添加膨胀剂钢管混凝土徐变系数时变规律基本一致。在合理假设钢管混凝土徐变机理前提下,依据继效流动理论和多轴应力下徐变理论,提出钢管混凝土徐变系数终值估算方法;钢管膨胀混凝土徐变模型中徐变系数终值由可恢复的滞后弹性变形、不可恢复的初始急变塑性变形和不可恢...

Through long-term test on the shrinkage and creep of eight concrete circular columns specimen for more than 800 days in the indoor environment, and the comparison of time history of shrinkage and creep among different types of cylinders, including concrete cylinder, concrete filled steel tube and expansive concrete filled steel tube, the shrinkage and creep properties of expansive concrete filled steel tube were obtained. Results show that shrinkage strain of expansive concrete filled steel tube is small, and the early shrinkage deformation is ...