基于损伤理论的硅藻土混凝土冻融损伤研究  

Study on Freeze-thaw Damage of Diatomite Concrete Based on the Damage Theory

作　　者：王艺程 郑一峰[1] 秦泳[1] 于泽[1] WANG Yi-cheng;ZHENG Yi-feng;QIN Yong;YU Ze(College of Construction Engineering Jilin University,Changchun 130021,China)

机构地区：[1]吉林大学建设工程学院,吉林长春130021

出　　处：《混凝土与水泥制品》2021年第3期15-19,共5页China Concrete and Cement Products

基　　金：国家自然科学基金项目(51208224)。

摘　　要：通过快速冻融试验,对不同强度等级的掺硅藻土混凝土的抗冻性进行了分析。在损伤理论的基础上构建了多次冻融后混凝土劣化失效的数学模型,使用Matlab程序模拟了混凝土内部各单元点的损伤失效与时间的函数关系,并生成了混凝土的截面损伤概率图。在冻融循环时间相同的条件下对不同硅藻土掺量的混凝土进行了对比分析。结果表明:硅藻土的加入使混凝土的抗冻性能得到了提高;模型模拟的混凝土损伤过程符合冻融破坏的变化规律。Through the rapid freeze-thaw experiment,the frost resistance of diatomite mixed with concrete of different strength levels was systematically analyzed.Based on the damage theory,a mathematical model of concrete degradation and failure after multiple freeze-thaw cycles was constructed.The Matlab program was used to simulate the functional relationship between the damage failure and time of each unit point in the concrete material,and a cross-sectional damage probability map of concrete was generated.Under the condition of the same freeze-thaw cycle time,the concrete with different diatomite content was compared.The results show that the frost resistance of concrete is improved by adding diatomite.And using the damage model for performance analysis,the concrete damage process simulated by the model conforms to the change law of freeze-thaw damage.

关 键 词：混凝土 冻融损伤 硅藻土 损伤模型 威布尔分布 

分 类 号：TU528[建筑科学—建筑技术科学]