【摘要】 文章以三个基本假设为基础 ,定义了描述混凝土在疲劳荷载下损伤与应变概率关系的P -D -ε曲线。对大量试验数据分析发现 :给定损伤量下的疲劳变形较好的服从三参数Weibull分布 ,进而得到了混凝土的P -D -ε曲线。据此可求得不同存活率下的损伤阈值应变εth、极限应变εf以及损伤量与疲劳变形的关系式 ,将其作为损伤、破坏和损伤量大小评定的标准更多还原

【Abstract】 Based on three basic hypotheses, P - D - εcurve describing probabilistic relationship between damage and strain of concrete under fatigue loading was defined in this paper. Analysis of a lot of test data found that fatigue strain in case of specified damage quantity follows three-parameter Weibull distribution, and moreover, P - D - εcurve of concrete was obtained. By using it, under different probabilities of survival damage threshold strain, destroy limit strain, and relationship between damage and strain could be got and considered as the assessment criterion of damage, destroy and damage quantity.更多还原