基于分段曲线模型的混凝土徐变变形损伤分析

Analysis of Creep Deformation Damage of Concrete Based on Piecewise Curve Model

文中基于单轴实验结果,在分析混凝土徐变变形产生过程的基础上,采用分段曲线模型,分析了不同强度混凝土损伤变量、总应力、有效应力与应变的对应关系。结果表明,混凝土等级越高,徐变变形前期损伤量越小。有效应力-应变关系与总应力-应变关系大致走势相近。分段曲线损伤模型较好反映了不同强度混凝土损伤演变规律,可为长期荷载作用下混凝土结构设计和安全运行提供参考。

Based on the results of uniaxial experiments, and on the basis of analyzing the creep deformation process of concrete, the piecewise curve model is used to analyze the corresponding relationship between the damage variables, total stress, effective stress and strain of concrete with different strengths. The results show that the higher the concrete grade, the smaller the damage in the early stage of creep deformation.The effective stress-strain relationship is roughly similar to the total stress-strain relationship. The piecewise curve damage model can better reflect the evolution law of concrete damage with different strengths, and can provide a reference for the design and safe operation of concrete structures under long-term loads.