Mesoscopic model to simulate the mechanical behavior of reinforced concrete members affected by corrosion
Mesoscopic model to simulate the mechanical behavior of reinforced concrete members affected by corrosion
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DOI：
10.1016/j.ijsolstr.2009.10.023
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发表时间：
2010-03
影响因子：
3.6
通讯作者：
P. Sánchez;A. Huespe;J. Oliver;S. Toro
中科院分区：
文献类型：
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作者：
P. Sánchez;A. Huespe;J. Oliver;S. Toro
在这方面的贡献，有限元方法设计来模拟腐蚀钢筋混凝土构件的结构恶化。建议的数值策略有能力重现许多众所周知的由嵌入钢筋中的腐蚀过程引起的（不希望的）机械效应，例如：由于腐蚀产物积累、周围混凝土中的损伤和开裂模式分布、钢-混凝土粘结应力传递的退化、钢筋中的净面积减小而导致的钢筋膨胀，主要是，所有这些机制对结构承载能力预测的影响。在数值水平上，每个组件的RC结构表示通过一个合适的FE制定。对于具体的，凝聚力模型的基础上连续强不连续性方法（CSDA）。钢筋的弹塑性本构关系建模。使用接触摩擦单元模拟界面，摩擦退化作为腐蚀侵蚀程度的函数。考虑两种不同的（且耦合的）介观分析以描述控制该问题的主要物理现象：（i）横截面水平的分析和（ii）结构构件水平的分析。所得力学模型可用于模拟广义钢筋锈蚀。实验和以前的数值结果，从现有的文献中获得的，被用来验证所提出的策略。
In this contribution, a finite element methodology devised to simulate the structural deterioration of corroded reinforced concrete members is presented. The proposed numerical strategy has the ability to reproduce many of the well-known (undesirable) mechanical effects induced by corrosion processes in the embedded steel bars, as for example: expansion of the reinforcements due to the corrosion product accumulation, damage and cracking patterns distribution in the surrounding concrete, degradation of steel–concrete bond stress transfer, net area reduction in the reinforcements and, mainly, the influence of all these mentioned mechanisms on the structural load carrying capacity predictions. At the numerical level, each component of the RC structure is represented by means of a suitable FE formulation. For the concrete, a cohesive model based on the Continuum Strong Discontinuity Approach (CSDA) is used. Steel bars are modeled by means of an elasto-plastic constitutive relation. The interface is simulated using contact-friction elements, with the friction degradation as a function of the degree of corrosion attack. Two different (and coupled) mesoscopic analyzes are considered in order to describe the main physical phenomena that govern the problem: (i) an analysis at the cross section level and (ii) an analysis at the structural member level. The resultant mechanical model can be used to simulate generalized reinforcement corrosion. Experimental and previous numerical results, obtained from the available literature, are used to validate the proposed strategy.