摘要
为了有效评估混凝土在冻融循环作用下的损伤,在混凝土损伤力学理论的基础上,结合实验测试建立混凝土冻融损伤预测模型,开展了引气混凝土在冻融作用后抗拉强度测试试验研究。针对混凝土的耐久性失效实质是一个内部损伤演变的逐步劣化过程,对混凝土试块进行网格离散,应用概率方法分析混凝土冻融随机损伤的累积发展过程,建立混凝土损伤演化的三维多元Weibull分布模型,基于梯度法进行参数估计,采用实测数据进行模型验证,设计了相应算法,采用C++语言编制程序进行计算,建立适用于冻融条件下的混凝土耐久性随机预测模型。数值和实测数据显示,随着冻融次数的增加,混凝土的损伤呈现非线性增长趋势。
In order to effectively assess the damage of concrete in freeze-thaw condition,prediction model for concrete frost damage is presented based on damage mechanical theory and the experimental test.The degeneration of tension strength of air-entraining concrete is tested after freezing and thawing.Provided with the fact that the degeneration of concrete is an interior damage evolving process,freezing and thawing damage accumulation of concrete is analyzed based on the discrete grid with probability of stochastic method.And Three-dimensional multi-parameters Weibull distribution model about concrete damage evolutions is presented.Parameters are estimated based on gradient method,and the mathematical model is verified according to the tested data.Corresponding algorithm is designed and programming is completed by C ＋ ＋ programming language to establish concrete durability prediction model under freeze-thaw conditions.It is indicated that the damage of concrete develops in nonlinear way as the freezing and thawing increases.
出处
《土木建筑与环境工程》
CSCD
北大核心
2011年第1期31-35,134,共6页
Journal of Civil,Architectural & Environment Engineering
基金
山东省自然科学基金(ZR2009FQ020)
高等学校博士学科点专项科研基金(20100131120042)
关键词
混凝土
冻融循环
试验研究
损伤
预测模型
程序
concrete
Freeze-thaw
Experimental study
damage
prediction model
program
