摘要
对经过0次、100次、200次、300次、400次冻融循环作用后的引气混凝土试件进行了双轴压、双轴拉-压荷载作用下的强度试验研究。观察了试件的破坏形态和表面裂缝的走向特征,根据试验结果分析了极限抗压、抗拉强度随冻融循环次数和应力比的变化规律。在主应力空间,建立了不同冻融循环次数后考虑应力比影响的双轴破坏准则;对于双轴压,建立了同时考虑应力比及冻融循环次数影响的破坏准则,对于双轴拉-压,建立了八面体应力空间的破坏准则;为寒冷地区处于双轴荷载作用下的引气混凝土结构的强度分析提供试验和理论依据。
The strength experiments of air-entrained concrete after 0, 100, 200, 300 and 400 freeze-thaw cycles under biaxial compression and biaxial tension-compression are carried out. The failure characteristic of specimens and the direction of surface cracking are observed. The influences of freeze-thaw cycles and stress ratio on the ultimate compressive and tensile strength are analyzed. The failure criterion expressed in terms of principal stress after different freeze-thaw cycles and stress ratios for specimen under biaxial loads is proposed. In addition, the failure criterion under biaxial compression with consideration of the influence of freeze-thaw cycles and stress ratio is proposed. The failure criterion under biaxial tension-compression with consideration of the influence of stress ratio is established in octahedral stress space. The experimental and theoretical foundations for strength analysis of air-entrained concrete structures subject to biaxial loads in cold environment are provided.
出处
《工程力学》
EI
CSCD
北大核心
2007年第6期134-141,共8页
Engineering Mechanics
基金
国家自然科学基金资助项目(50479059)
关键词
引气混凝土
冻融循环
双轴压
双轴拉-压
应力比
破坏准则
air-entrained concrete
freeze-thaw cycles
biaxial compression
biaxial tension-compression
stress ratio
failure criterion
