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基于自行研制的适用于100 mm分离式霍普金森压杆(split Hopkinson pressure bar,SHPB)装置的高温试验设备,采用相应高温试验技术在100 mm SHPB装置上对混凝土分别在常温、200、400、600、800和1000℃下的动态力学特性进行了试验研究。结果表明:高温下混凝土的动态应力应变曲线体现出温度效应和应变率效应,随温度和应变率增大,曲线逐渐表现出塑性特性;高温下混凝土的动态抗压强度随温度升高或平均应变率增长先提高后降低;高温下混凝土的动态峰值应变随温度升高或平均应变率增大而不断提高,动态峰值应变与平均应变率之间存在近似线性增长关系;高温下的动态峰值应变大于常温下,相对增幅随温度升高或应变率增大而不断提高。
Based on a self-developed high-temperature test equipment suitable for a Hop100 mm split Hopkinson pressure bar (SHPB) unit, the corresponding high temperature test technique was used to test the concrete at 温100 mm SHPB at room temperature, 200, 400,600,800 and 1000 ℃ dynamic mechanical properties of the experimental study. The results show that the dynamic stress-strain curve of concrete at high temperature shows the effect of temperature and strain rate. The curve shows plasticity gradually with the increase of temperature and strain rate. The dynamic compressive strength of concrete at high temperature increases with the increase of temperature or the average strain The rate of increase firstly decreases and then decreases; the dynamic peak strain of concrete increases with the increase of temperature or the average strain rate at high temperature, and there is an approximately linear relationship between the dynamic peak strain and the average strain rate; the dynamic peak strain at high temperature is greater than Under normal temperature, the relative increase increases with the increase of temperature or strain rate.