高温作用下混凝土动态力学性能时间效应试验研究  被引量:3

Tests for time effect on concrete dynamic mechanical property under high temperature

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作  者:李洪超[1] 刘殿书[1] 黄永辉[2] 梁书锋[1] 李明慧[1] 

机构地区:[1]中国矿业大学(北京)力学与建筑工程学院,北京100083 [2]昆明理工大学电力工程学院,昆明650500

出  处:《振动与冲击》2015年第13期182-188,194,共8页Journal of Vibration and Shock

摘  要: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>190 min时,试件动态抗压强度不再降低趋于稳定。Here,the concrete dynamic mechanical properties under high temperature were studied.In order to determine the concrete specimen’s heating time in different temperature groups,ANSYS software was adopted to compute the temperature field in the heating process of C60 concrete specimens.The impact loading tests were conducted for concrete specimens under high temperature with different heating time by using a 75-mm-diameter split Hopkinson pressure bar (SHPB)apparatus and a temperature control device.The results showed that C60 concrete has obvious temperature effect and time effect;its dynamic compressive strength rises at first and then falls with increase in temperature and reaches the maximum at about 200℃;its peak strain rises with increase in temperature;under 100℃, 200℃,300℃,400℃ and 500℃ steady-state temperature fields,with increase in heating time,its dynamic compressive strength decreases,its peak strain rises,and its elastic modulus decreases;in 500℃ steady temperature field,when the heating time is greater than 190 min,its dynamic compressive strength tends to be stable and no longer decreases.

关 键 词:混凝土 SHPB 高温 加热时间 动态力学性能 

分 类 号:O347.3[理学—固体力学] TU528.1[理学—力学]

 

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