摘要
为研究应变速率对面板混凝土经冻融劣化后动力性能的影响,对面板混凝土进行不同次数(0、25、50、75、100、125、150、175、200次)的冻融循环和不同应变速率(1×10-5、1×10-4、2×10-4、5×10-4、1×10-3s-1)的单轴压缩以及常规三轴试验。结果表明:单轴压缩试验下,应变速率相同的面板混凝土,冻融劣化程度加大,其动态极限抗压强度逐渐降低,峰值应变逐渐提高;冻融次数相同的面板混凝土,随着应变速率的增大,其单轴动态极限抗压强度随之增大,峰值应变随之降低。常规三轴试验下,经100次冻融循环、同一应变速率的面板混凝土,随着围压的增大,其极限抗压强度增幅减弱,混凝土的率敏感性有所降低,峰值应变随之提高。
In order to study the effects of different strain rates on the dynamic performance of panel concrete after freeze-thaw degradation,uniaxial compression and conventional triaxial experiments were carried on panel concrete with different freeze-thaw cycles(0,25,50,75,100,125,150,175,and 200 times,respectively)and different strain rates(1×10^-5,1×10^-4,2×10^-4,5×10^-4,1×10^-3 s^-1,respectively).The results showed that under the uniaxial compression test,the concrete with the same strain rate has a greater degree of freeze-thaw deterioration,and its dynamic ultimate compressive strength gradually decreases,and the peak strain gradually increases.The concrete of same freeze-thaw cycles will increase the uniaxial dynamic ultimate compressive strength and decrease the peak strain as the strain rate increases.Under the conventional triaxial test,the panel concrete with the same strain rate after 100 freeze-thaw cycles and with the increase of confining pressure,the rate sensitivity of concrete decreases and the peak strain increases with the ultimate compressive strength increases.
作者
李岩
王瑞骏
秦睿
赖韩
李晓彤
LI Yan;WANG Ruijun;QIN Rui;LAI Han;LI Xiaotong(Faculty of Water Resources and Hydro-electric Engineering,Xi'an University of Technology,Xi'an 710048,China)
出处
《水资源与水工程学报》
CSCD
2018年第6期184-189,共6页
Journal of Water Resources and Water Engineering
基金
陕西省教育厅重点实验室科研计划项目(17JS092)
关键词
面板混凝土
冻融循环
应变速率
动力性能
损坏准则
panel concrete
freeze-thaw cycle
strain rate
dynamic performance
damage criterion
