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首页> 外文会议>IUYAM Symposium on Theoretical and Numerical Methods in Continuum Mechanics of Porous Materials, Sep 5-10, 1999, Stuttgart, Germany >The Physical Role of Crack Rate Dependence in the Long-Term Behaviour of Cementitious Materials
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The Physical Role of Crack Rate Dependence in the Long-Term Behaviour of Cementitious Materials

机译：裂纹速率依赖性在胶凝材料长期行为中的物理作用

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摘要

Evidence has been presented for the necessity to consider the crack rate dependence as an important source of time dependence next to bulk creep in a porous, cementitious material. Only by including this contribution to the cracking resistance, the observed times to failure and the crack mouth opening displacements in three-point bending creep tests of concrete beams can be computed with reasonable accuracy. Two formulations have been presented for the modelling of the crack rate dependence. A simple, single parameter model accounts for the viscosity of the cracking process, but cannot simulate the observed strength increase over a wide range of loading rates. A cracking strain rate-dependent viscosity may solve this problem. It has been shown that the three-parameter model proposed by Bazant ([1]), where such a dependence is incorporated, can represent the rate dependence over a wide range of loading rates.
机译：已有证据表明，在多孔的胶结材料中，将蠕变速率依赖性视为紧随体积蠕变的重要时间依赖性来源。仅包括对抗裂性的贡献，就可以以合理的精度计算出观察到的破坏时间和混凝土梁三点弯曲蠕变试验中的裂口张开位移。已经提出了两种公式来对裂纹率依赖性进行建模。一个简单的单参数模型说明了裂化过程的粘度，但是无法模拟观察到的在较大加载速率下强度的增加。取决于裂纹应变速率的粘度可以解决该问题。已经表明，由Bazant（[1]）提出的三参数模型结合了这种依赖性，可以表示在较宽的加载速率范围内的速率依赖性。

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