Effect of loading rate on the tensile behaviour of concrete: description of the physical mechanisms
Effect of loading rate on the tensile behaviour of concrete: description of the physical mechanisms
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DOI：
10.1007/bf02486201
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发表时间：
1996-03-01
影响因子：
3.8
通讯作者：
Toutlemonde, E
中科院分区：
文献类型：
--
作者：
Rossi, P;Toutlemonde, E
本文在蓬茨和桥中央研究所关于混凝土动力特性的几篇文章（已发表）的基础上，根据对这一课题的新认识，试图进一步发展物理机理的分析。特别是调查如何斯特凡效应，开裂过程中，和惯性力一起参与的动态行为的试样进行单轴拉伸试验。这些机制可以概括为：1.在应变速率小于约1 s（-1）时，主要的物理机制是粘性机制，可被视为类似于Stefan效应。这种机制既对抗了导致混凝土抗拉强度增加的微裂纹局部化，又对抗了导致混凝土破坏的宏观裂纹扩展。当应变速率大于或等于约10 s（-1）时，惯性力占优势。它们对抗微裂纹局部化，特别是宏观裂纹扩展。
Founded upon several works carried out by the Laboratoire Central des Ponts et Chaussees on the dynamic behaviour of concrete (already published), and upon new ideas about dais subject, this article attempts to further develop the analysis of the physical mechanisms. In particular to investigate how the Stefan effect, the cracking process, and the inertia forces participate together in the dynamic behaviour of a specimen subjected to a uniaxial tensile test. These mechanisms can be summed up as follows:1. At strain rates smaller than approximately 1 s(-1), the main physical mechanism is a viscous mechanism that may be regarded as similar to the Stefan effect. This mechanism counters both a microcracking localization, leading to an increase of concrete tensile strength, and the macrocrack propagation that leads to failure of the specimen.2. At strain rates greater than or equal to approximately 10s(-1), the forces of inertia become preponderant. They counter microcracking localization and in particular macrocrack propagation.