摘要
通过单面剪切试验研究冻融环境下复合板-混凝土界面的退化规律和机理。经过冻融循环(30次)后,界面的极限承载力和断裂能急剧下降,冻融循环次数增加,界面的极限承载力的下降幅度减小,断裂能保持较为稳定。复合板-混凝土体系内含水量增加将加速复合板-混凝土的界面断裂能和极限承载力下降程度。冻融循环后,复合板-混凝土的界面破坏模式由混凝土撕裂转变为混合破坏模式。
Effects of freeze-thaw cycles on the behavior of bond between CFRP plates and concrete substrate were experimentally investigated by single-shear test. The ultimate bearing capacity and fracture energy of the interface dropped significantly after 30 cycles. With the increasing of freeze-thaw cycles, the ultimate bearing capacity decreased slightly and a stable value of the fracture energy was observed. The more water ingress was in the adhesive/ concrete interface, the more significantly the ultimate bearing capacity and fracture energy decrease. Freeze-thaw cycles altered the debonding mode from cohesive concrete fracture to mix failure mode.
出处
《工业建筑》
CSCD
北大核心
2016年第5期50-54,共5页
Industrial Construction
基金
国家自然科学基金资助项目(51178147
51478145)
国家重点基础研究发展计划(973计划)资助项目(2012CB026200)
关键词
复合板-混凝土
冻融循环
极限承载力
断裂能
破坏模式
CFRP plate-concrete
freeze-thaw cycles
ultimate bearing capacity
fracture energy
failure mode
