考虑残余变形的高强混凝土徐变恢复分数阶黏弹性模型  

Fractional model for creep-recovery analysis of high strength concrete with considering residual deformation

作　　者：闫婷婷 YAN Tingting(Hebei Jintao Construction Engineering Quality Testing Co.Ltd,Shijiazhuang 050021,China)

机构地区：[1]河北金涛建设工程质量检测有限公司,石家庄050021

出　　处：《水科学与工程技术》2025年第2期65-68,共4页Water Sciences and Engineering Technology

摘　　要：高强混凝土在基础设施建设中的应用日益广泛,分析混凝土结构在复杂荷载下的变形发展需要考虑徐变恢复的影响,目前针对高强混凝土徐变恢复的计算分析模型尚较少。通过对比分析既有徐变恢复经验性模型对高强混凝土(HSC)的预测效果,发现由于混凝土的原材料种类、级配及配合比等因素不同,既有模型即使经过强度改进也难以准确预测单一混凝土的徐变恢复行为。文中基于叠加原理和双函数法构建模型参数少的分数阶黏弹性模型,经分析发现基于叠加原理过高估计了混凝土变形恢复能力。通过参数分析,提出考虑残余变形修正的双函数分数阶模型,提高了对高强混凝土(HSC)徐变恢复的预测效果。With widespread use of high strength concrete(HSC),accurate prediction of creep-recovery behavior under various loads has become an important concern.Although the creep-recovery test of HSC has been observed,the creep-recovery behavior after unloading has not been specially calculated and analyzed.Firstly,the creep-recovery models were compared and the results show that none of the existing creep-recovery model can predict the creep recovery behavior of HSC well.Secondly,a fractional calculus model is proposed with two-function method to predict the creep and creep-recovery behavior.The results show that the revised model can accurately reflect the static viscoelastic behavior of HSC.Based on the experimental data,the model parameters for different HSC materials were given.

关 键 词：高强混凝土 徐变恢复 分数阶黏弹性模型 双函数法 

分 类 号：U444[建筑科学—桥梁与隧道工程]