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首页> 美国卫生研究院文献>Materials >Dynamic Tensile Properties and Energy Dissipation of High-Strength Concrete after Exposure to Elevated Temperatures
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Dynamic Tensile Properties and Energy Dissipation of High-Strength Concrete after Exposure to Elevated Temperatures

机译：高强度混凝土暴露于升高温度后的动态拉伸性能和能量耗散

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摘要

In view of the devastating outcomes of fires and explosions, it is imperative to research the dynamic responses of concrete structures at high temperatures. For this purpose, the effects of the strain rate and high temperatures on the dynamic tension behavior and energy characteristics of high-strength concrete were investigated in this paper. Dynamic tests were conducted on high-strength concrete after exposure to the temperatures of 200, 400, and 600 °C by utilizing a 74 mm diameter split Hopkinson pressure bar (SHPB) apparatus. We found that the quasi-static and dynamic tensile strength of high-strength concrete gradually decreased and that the damage degree rose sharply with the rise of temperature. The dynamic tensile strength and specific energy absorption of high-strength concrete had a significant strain rate effect. The crack propagation law gradually changed from directly passing through the coarse aggregate to extending along the bonding surface between the coarse aggregate and the mortar matrix with the elevation of temperature. When designing the material ratio, materials with high-temperature resistance and high tensile strength should be added to strengthen the bond between the mortar and the aggregate and to change the failure mode of the structure to resist the softening effect of temperature.
机译：鉴于火灾和爆炸的毁灭性结果，必须研究高温下混凝土结构的动态响应。为此目的，在本文研究了应变速率和高温对高强度混凝土动态张力行为和能量特性的影响。在暴露于200,400和600°C的温度下，通过利用74mm直径的分裂霍普金森压棒（SHPB）装置，在高强度混凝土上进行动态测试。我们发现，高强度混凝土的准静态和动态拉伸强度逐渐减少，随着温度的升高，损伤程度急剧上升。高强度混凝土的动态拉伸强度和特定能量吸收具有显着的应变率效应。裂缝传播法从直接通过粗骨料逐渐变化，以沿着粗骨料和砂浆基质之间的粘接表面延伸，随着温度的升高。在设计材料比时，应加入具有高耐温性和高抗拉强度的材料，以加强砂浆和骨料之间的粘合，并改变结构的故障模式以抵抗温度的软化效果。

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