经历循环荷载历史后饱和混凝土动态性能试验研究  

Dynamic Performance Test Study of Saturated Concrete after Cyclic Loading

作　　者：李少丽 刘立荣 王乾峰[2] LI Shao-li;LIU Li-rong;WANG Qian-feng(Department of Railway Engineering,Shijiazhuang Institute of Railway Technology,Shijiazhuang Hebei 050041;College of Civil Engineering & Architecture,China Three Gorges University,Yichang Hubei 443002 China)

机构地区：[1]石家庄铁路职业技术学院,河北石家庄050041 [2]三峡大学土木与建筑学院,湖北宜昌443002

出　　处：《石家庄铁路职业技术学院学报》2019年第1期91-96,共6页Journal of Shijiazhuang Institute of Railway Technology

基　　金：国家自然科学基金项目(51279092)

摘　　要：为了研究循环荷载历史对饱和混凝土的力学性能的影响,采用φ150×300mm的圆柱体试件,对饱和混凝土试件在不同荷载循环次数(0次、25次、50次、100次)与不同应变速率(10-5/s、10-4/s、10-3/s、10-2/s)作用下进行单轴压缩试验,分析了荷载循环次数以及应变速率对饱和混凝土的峰值应力、峰值应变和弹性模量的影响。研究表明:经历循环荷载历史后的饱和混凝土峰值应力随应变速率的增大而增大,随荷载循环次数的增加表现出先增大后减小的规律;随荷载循环次数的增加,饱和混凝土的峰值应变先增大后减小,随应变速率的增大总体呈增大的趋势;随应变速率的增加,饱和混凝土的弹性模量整体上呈现出增大的趋势。In order to study the effect of cyclic loading history on the mechanical properties of saturated concrete,Φ150×300 mm cylindrical specimens were used for uniaxial compression test,and saturated concrete specimens have been subjected to different load cycle times(0,25,50,and 100)with saturated different strain rates(10^-5/s,10^-4/s,10^-3/s,10^-2/s).This research analysis the effects of load cycles and strain rate on peak stress,peak strain and elastic modulus of saturated concrete.The results of this research indicate that:the peak stress of saturated concrete after cyclic loading increases with the increase of strain rate,and increases first and then decreases with the increase of the load cycle times.The peak strain of saturated concrete increases first,and then decreases with the increase of the load cycle times,and increases with the increase of strain rate.The elastic modulus of saturated concrete increases with the increase of strain rate.

关 键 词：循环荷载 饱和混凝土 应变速率 动态性能 峰值应力 峰值应变 弹性模量 

分 类 号：TU502[建筑科学—建筑技术科学]