饱和混凝土循环荷载后动态抗压性能研究  

Studies of the dynamic uniaxial compressive properties of saturated concrete after mechanical cyclic loading

作　　者：徐童淋 彭刚[1,2] 杨乃鑫 柳琪 XU Tonglin;PENG Gang;YANG Naixin;LIU Qi(College of Civil Engineering ＆ Architecture, China Three Gorges University, Yichang 443002, China;Hubei Provincial Collaborative Innovation Center for Geo-hazards and Eco-environment in Three Gorges Area, Yichang 443002, China)

机构地区：[1]三峡大学土木与建筑学院,湖北宜昌443002 [2]三峡地区地质灾害与生态环境湖北省协同创新中心,湖北宜昌443002

出　　处：《西安理工大学学报》2017年第4期469-475,共7页Journal of Xi'an University of Technology

基　　金：国家自然科学基金资助项目(51279092;51579139);三峡大学研究生科研创新基金资助项目(SDYC2016024)

摘　　要：本文利用静动力三轴仪对φ150mm×300mm圆柱体饱和混凝土试件在不同机械荷载循环(0次、25次、50次、100次)后进行了动静态单轴压缩试验。试验结果表明:经历循环荷载后饱和混凝土峰值应力随应变速率的增大而增大,随循环荷载次数的增大呈现先增大后减小的规律;峰值应变随应变速率的增大总体呈增大的趋势,随循环荷载次数增大呈现先增大后减小的规律;弹性模量随应变速率的增大整体上出现增大的趋势。选用基于Weibull统计理论的动态损伤本构模型对试验数据进行拟合,该模型能够较好模拟饱和混凝土本构关系。To study the dynamic mechanical properties of saturated concrete after mechanical cy- clic loading, the uniaxial compression tests of concrete specimens with varied numbers of mechan- I ical cyclic loading are carried out at the 10 MN triaxial static-dynamic instrument under different loading rates. The results show that for the concrete specimens with varied numbers of mechani- cal cyclic loading, the peak stress increases with the strain rate, while the peak stress increases and then decreases with the number of mechanical cyclic loading. The peak strain increases with the strain rate in general, while it increases and then decreases with the number of cyclic loading. The elastic modulus increases with the strain rate in general. The dynamic damage constitutive model based on the Weibull statistical theory fits the experimental data with the result that the model is in agreement with the experimental data of saturated concrete.

关 键 词：饱和混凝土 荷载循环次数 应变速率 峰值应力 本构模型 

分 类 号：TV431[水利工程—水工结构工程]