为研究混凝土的高温动态力学性能，采用ANSYS软件对C60混凝土试件加热过程中的温度场进行计算，以确定不同温度组试件的加热时间。利用SHPB试验装置和加热电阻炉进行高温下不同加热时间的混凝土抗冲击性能试验研究。试验结果表明：C60混凝土表现出明显的温度效应和时间效应，在不同高温下，随着加热温度的升高试件动态抗压强度先增大后减小，峰值应变增大，且在200℃左右动态抗压强度达到最大；在相同高温不同加热时间的条件下，随着加热时间的增加，试件动态抗压强度不断降低，峰值应变增大，弹性模量减小，且在500℃的稳态温度场中，当加热时间>190min时，试件动态抗压强度不再降低趋于稳定。
Abstract
The aim of this paper is to investigate concrete dynamic mechanical properties at high temperature. In order to determine the concrete specimen heating time in different temperature groups, adopt the ANSYS software to simulate the temperature field during the heating process. Impact loading experiments were carried out on concrete at high temperature and different heating time by using a 75-mm-diameter split Hopkinson pressure bar (SHPB) apparatus and temperature control device. The results show that C60 concrete has obvious temperature effect and time effect. The dynamic compressive strength rises at first and then falls with increasing temperature and achieves the maximum at about 200℃, the peak strain rises with temperature increasing; Under 100℃, 200℃, 300℃, 400℃ and 500℃ steady-state temperature fields respectively, with increasing temperature, the dynamic compressive strength decreases and the peak strain rises and the elastic modulus decreases, and in the 500℃ steady temperature field, when the heating time being greater than 190 min, the dynamic compressive strength is tending towards stability and no longer decreases.
关键词
混凝土 /
SHPB /
高温 /
加热时间 /
动态力学性能
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参考文献
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