摘要
运用分离式霍普金森压杆装置（SHPB）对混凝土在温度为16~650℃,加载撞击速度为5 m/s、7 m/s、12 m/s下的力学行为进行了研究。设计出混凝土高温SHPB试验技术,并分析了混凝土在不同温度及撞击速度下的破坏特征,试验分析表明,在相同撞击速度下,混凝土试件应变率随温度升高而增大,拟合得到了应变率与温度的关系方程,在大量混凝土高温动态应力应变曲线分析基础上,获得混凝土高温动态强度随加载应变率增加而增大,随温度升高而减小的变化规律,同时,混凝土应变率增强效应与高温弱化效用相互耦合中,混凝土受温度影响显著。
Dynamic mechanical behaviors of concrete with high temperature were studied by the split Hopkinson pressure bar（SHPB） over a wide range of temperatures changing from 16 ℃ to 650 ℃ and loading speed which respectively were 5 m/s、7 m/s and 12 m/s.Testing technology of SHPB on concrete with high temperature was introduced firstly,then the failure forms of concrete specimens at different temperatures and loading speed were analyzed.According to the result of tests,the strain rate of the concrete spicimen were increased as the increasing temperatures,so the equation between strain rate and temperature was fitted.The dynamical stress-strain curves about concrete with high temperature showed the dynamic strength of concrete increased with the increasing loading speed and decreased with the increasing temperature.So,the enhancing effect about strain rate and weakening effect about high-temperature were coupled,the effect of temperature was significantly greater than the effect of strain rate.
出处
《武汉理工大学学报》
CAS
CSCD
北大核心
2010年第21期34-37,共4页
Journal of Wuhan University of Technology
基金
国家自然科学基金(10602048
10972187)
关键词
混凝土
高温
SHPB试验
动态特性
concrete
high temperature
SHPB
dynamic mechanical behavior
