铁道科学与工程学报2018，Vol.15Issue(6)：1363-1372,10.
板式轨道充填层自密实混凝土的动态力学特性
Dynamic mechanical properties of filling layer self-compacting concrete applied in slab track system
摘要
Abstract
In order to better understand the mechanical properties of self-compacting concrete (SCC) applied in CRTS III type slab ballastless track filling layer under dynamic load such as high speed train, dynamic mechanical properties of filling layer SCC under 10～100 s-1 were studied using split Hopkinson pressure bar (SHPB) method, and the corresponding dynamic constitutive model was established based on strain equivalence hypothesis and statistical damage theory. Results show that the larger the strain rate is, the higher damage level SCC specimens present; The peak strength, peak strain and specific energy absorption of SCC specimens increase with growing strain rate, showing prominent strain-rate sensitivity; Moreover, the level of strain-rate sensitivity for SCC is larger than that for normal concrete. The established dynamic constitutive model can be used to describe the dynamic stress-strain relationship of SCC under investigated strain rates.关键词
充填层自密实混凝土/动态力学性能/应变率/本构模型/SHPB试验Key words
filling layer SCC/dynamic mechanical properties/strain rate/constitutive model/SHPB test分类
建筑与水利引用本文复制引用
龙广成,李宁,谢友均,马昆林..板式轨道充填层自密实混凝土的动态力学特性[J].铁道科学与工程学报,2018,15(6):1363-1372,10.基金项目
国家自然科学基金资助项目(51678568,51678569,11790283) （51678568,51678569,11790283）
中南大学中央高校基本科研业务费专项资金资助项目(2016zzts074) （2016zzts074）
