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采用ANSYS软件模拟C60混凝土试件加热过程中的温度场,确定不同温度组试件的加热时间.利用高温SHPB试验装置进行不同加热长的高温后混凝土冲击压缩试验,分析了高温和加热时间对混凝土动态压缩力学性能的影响.结果表明:经历高温后且不同加热时间的混凝土材料,在自然冷却后表现出明显的温度软化效应和时间效应;在不同高温后,随着加热温度的升高混凝土动态抗压强度逐渐减小,峰值应变先增大而后略微降低且始终大于室温条件下的峰值应变;在相同温度且不同加热时间的条件下,混凝土随着加热时间的增加,其动态抗压强度不断降低,峰值应变总体上先增大后减小,弹性模量减小.
The temperature field during the heating process of C60 concrete specimens was simulated by ANSYS software to determine the heating time of specimens in different temperature groups.The impact compression tests of concrete after high temperature and different heating temperatures were carried out by using high temperature SHPB test equipment.The influence of high temperature and heating time on concrete Dynamic compressive mechanical properties.The results show that concrete materials subjected to high temperature and different heating time show obvious temperature softening effect and time effect after natural cooling.With the increase of heating temperature, The compressive strength decreases gradually, the peak strain first increases and then decreases slightly and is always greater than the peak strain at room temperature. Under the same temperature and different heating time, the dynamic compressive strength of concrete increases with the heating time Decreases, the peak strain first increases and then decreases, and the elastic modulus decreases.