基于不同破坏准则的混凝土冻融双轴受压破坏模型研究  

Study on Concrete Freeze-thaw Biaxial Compression Failure Model under Different Failure Criteria

作　　者：刘苗苗 彭刚[1] 程卓群 孙尚鹏 王普 LIU Miaomiao;PENG Gang;CHENG Zhuoqun;SUN Shangpeng;WANG Pu(College of Civil and Architecture,China Three Gorges University,Yichang 443002,Hubei,China)

机构地区：[1]三峡大学土木与建筑学院

出　　处：《水力发电》2019年第10期116-121,共6页Water Power

基　　金：国家自然科学基金资助项目(51579139,51709155)

摘　　要：为研究不同冻融循环次数加载下混凝土的力学性能,利用大型多功能液压伺服三轴仪对双向应力状态下不同冻融次数(0、20、40次)和不同侧压力(0、0.06 f c、0.12 f c、0.18 f c、0.24 f c)的混凝土进行了静态(应变速率10-5/s)压缩试验,建立了基于Ottosen准则、Bresler-Pister准则以及Kupfer-Gerstle准则的混凝土冻融双轴受压破坏模型。通过分析发现,基于Ottosen准则、Bresler-Pister准则和Kupfer-Gerstle准则所建模型均能很好地反映侧压力在0~0.24 f c范围内的混凝土双轴受压破坏规律,基于改进Kupfer-Gerstle准则建立的混凝土冻融受压破坏模型计算精度更高,且适用于单轴和双轴受压破坏的模拟。In order to study the mechanical properties of concrete under different freeze-thaw cycle times,the large-scale multi-function hydraulic servo triaxial apparatus is used to carry out the static compression tests(strain rate 10-5/s)of concrete samples with different freeze-thaw cycle times(0,20,40 times)and different lateral pressures(0,0.06 f c,0.12 f c,0.18 f c and 0.24 f c)under biaxial stress state.The freeze-thaw biaxial compression failure models of concrete are established based on Ottosen criterion,Bresler-Pister criterion and Kupfer-Gerstle criterion respectively.The analyses find that all the freeze-thaw biaxial compression failure models of concrete based on Ottosen criterion,Bresler-Pister criterion and Kupfer-Gerstle criterion can well reflect the failure law of concrete biaxial compression under the lateral pressure of 0~0.24 f c,and the failure model based on improved Kupfer-Gerstle criterion has higher calculation accuracy and is suitable for the simulation of uniaxial and biaxial compression failure.

关 键 词：冻融破坏 双轴受压 Ottosen准则 Bresler-Pister准则 Kupfer-Gerstle准则 

分 类 号：TU528[建筑科学—建筑技术科学]