摘要
本文对经过0、255、0、75次快速冻融循环作用的混凝土试件进行了三个方向均为压荷载时的力学性能测试,观察了试件的破坏形态以及裂缝的走向特征,测得了试件的强度和应变,并采集到了应力-应变关系曲线。根据试验结果,讨论了冻融循环次数及中间应力对峰值应力及其所对应的应变的影响,建立了冻融循环后试件应变与中间应力比的关系式。
The mechanical properties of concrete specimen under triaxial compression after 0, 25, 50 and 75 cycles of freezing-thawing are studied experimentally. The failure characteristics and superficial cracking directions of specimens are observed, the strength and strain in three loading directions as well as the stress-strain relationship are obtained. The effect of freezing-thawing cycles and the influence of intermediate principle stress on peak stress and corresponding strain are analyzed according to test result.Based on test data, the strength criteria expressed in terms of octahedral stresses are proposed and the relationship between strain and stress ratio is established. This experimental result is helpful in improving the design and predicting the life of concrete structures in cold region.
出处
《水利学报》
EI
CSCD
北大核心
2006年第7期874-879,885,共7页
Journal of Hydraulic Engineering
基金
辽宁省教委科研基金项目(2023901023)
关键词
混凝土
三向受压
冻融循环
破坏准则
concrete
triaxial compression
mechanical properties
freezing and thawing cycles
octahedral stresses
strength criteria
