Dynamic compressive behaviour of concrete after exposure to elevated temperatures

被引:13
|
作者
Ren, Weibo [1 ]
Xu, Jinyu [1 ,2 ]
Su, Haoyang [1 ]
机构
[1] Air Force Engn Univ, Dept Airfield & Bldg Engn, Xian 710038, Shaanxi, Peoples R China
[2] Northwest Polytech Univ, Coll Mech & Civil Architecture, Xian 710072, Shaanxi, Peoples R China
基金
中国国家自然科学基金;
关键词
Concrete; Elevated temperature; Split Hopkinson pressure bar; Dynamic mechanical properties; Stress-strain relationship; HOPKINSON PRESSURE BAR; FILLED STEEL TUBES; A-DEGREES-C; MECHANICAL-PROPERTIES; IMPACT BEHAVIOR; RADIAL INERTIA; STRENGTH;
D O I
10.1617/s11527-015-0722-3
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
The aim of this paper is to investigate the high temperature performance of concrete under impact loading. A split Hopkinson pressure bar system was employed to determine the dynamic mechanical properties of concrete under different strain rates and temperatures. The results indicate that the hardening and toughening effects of strain rate on concrete are obvious under a given temperature. Moreover, high temperature exposure makes concrete more ductile and less resistant to impact loading. An increase in temperature leads to an obvious reduction in dynamic strength and toughness, and results in a larger strain rate and critical strain. Whereas for temperature of 200 degrees C, the dynamic strength barely changes even slightly increases. Meanwhile, the toughness at this temperature decreases firstly and later increases with strain rate in comparison to that at room temperature. Besides, as temperature increases, the dynamic fragmentation of concrete gets more violent, the stress-strain curve tends to flatten and the corresponding ascending branch becomes less steep. The stress-strain relationship of concrete under different strain rates and temperatures can be formulated by a modified model, which can well describe the dynamic mechanical behaviour of the heated concrete.
引用
收藏
页码:3321 / 3334
页数:14
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