Dynamic properties of concrete in direct tension
Dynamic properties of concrete in direct tension
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DOI：
10.1016/j.cemconres.2006.03.003
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发表时间：
2006-07
影响因子：
11.4
通讯作者：
D. Yan;G. Lin
中科院分区：
文献类型：
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作者：
D. Yan;G. Lin
利用伺服液压试验机对混凝土受拉的应变率相关性能进行了试验研究。样本制成哑铃形状，测试的应变速率范围为10 - 5/s至10 - 0.3/s。研究了应变率对混凝土抗拉强度、弹性模量、临界应变、泊松比和能量吸收能力的影响。重点研究了温度和含水量对应变率敏感性的影响。所有的测试数据进行了分析，讨论和比较与现有的参考材料。此外，还研究了应变率对试件损伤模式的影响。结果表明，试件的破坏面越来越平坦，大量粗集料沿破坏面沿着破碎。基于这一现象，提出了快速加载过程中应变率增强的物理机制的解释。
An experimental study on the strain-rate dependent behavior of concrete in tension was carried out by means of a servo-hydraulic testing machine. The specimens were made in dumbbell shape and the tested strain rate ranged from 10−5/s to 10−0.3/s. Strain-rate effects on the tensile strength, the modulus of elasticity, the critical strain, the Poisson's ratio and the energy absorption capacity of concrete were studied. More emphasis was placed on the influence of temperature and moisture content on the strain-rate sensitivity. All test data were analyzed, discussed and compared with available reference materials. In addition, strain-rate effects on the damage pattern of specimens were studied. It was observed that the fractured surfaces of the specimens became more and more flattened and a number of coarse aggregates were broken along the failure surfaces. Based on this phenomenon an explanation to the physical mechanisms of strain-rate enhancement during rapid loading was proposed.