高温下混凝土动态强度特性  

Dynamic Strength Property of Concrete at Exposure to Elevated Temperature

作　　者：张宗刚 许金余[2,3] 苏灏扬[2] 刘志群[2] 

机构地区：[1]93199部队后勤部机场营房处 [2]空军工程大学 [3]西北工业大学力学与土木建筑学院

出　　处：《硅酸盐通报》2015年第2期501-505,共5页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金项目(51378497);国家自然科学基金项目(51208507)

摘　　要：本文采用自主研制的高温SHPB试验系统对200℃、400℃、600℃和800℃下混凝土的动态强度特性进行了试验研究,分析了应变率与温度对混凝土抗压强度的影响,结果表明:不同温度下,混凝土的应变率均随弹速的提高线性增长;混凝土的动态抗压强度随应变率的升高而增大;存在一个临界应变率,使得当应变率大于该临界应变率时,动态强度增长因子随应变率对数的增大而显著提高;温度对混凝土强度有显著影响,400℃时动态抗压强度高于常温。The strength property of concrete at exposure to 200 ℃,400 ℃,600 ℃ and 800 ℃,respectively,is investigated using self-designed high temperature SHPB system. The strain rate effect and temperature effect are analyzed. The results show that at each temperature,the strain rate increase with projectile velocity by linear approximation. The dynamic strength of concrete increases with strain rate.There exists a critical strain rate, beyond which the dynamic strength increase factor increases dramatically as the logarithm of strain rate enhances. Temperature has a great effect on the strength of concrete. The dynamic compressive strength at 400 ℃ is higher than that at room temperature.

关 键 词：混凝土 应变率 温度 抗压强度 

分 类 号：TU528[建筑科学—建筑技术科学]