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Experimental and numerical study on cracking process in RC and R/FRC ties

机译：RC和R / FRC连接处开裂过程的实验和数值研究

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摘要

A numerical non-linear procedure able to represent the behavior of cracked steel fiber reinforced concrete (SFRC) is herein presented and verified. The involved post-cracking mechanisms, particularly tension softening and tension stiffening, have been investigated and properly taken into account. Different tension softening relationships have been implemented and discussed, one based on a micro-mechanical approach, another obtained from inverse analysis and finally the Model Code 2010 (MC2010) law. These models have been adopted in conjunction with a smeared crack approach to perform FE simulations of R/FRC ties characterized by different cross-sections and fiber volume fractions. Numerical results have been validated against a comprehensive experimental program on R/FRC (characterized by a tension softening behavior) and RC ties recently carried out at the University of Brescia. Comparisons between experimental and numerical results indicate that smeared models can be adopted also for the analysis of this structural typology, subjected to a uniaxial state of stress, as a valuable alternative to discrete approaches.
机译：本文介绍并验证了能够表示开裂的钢纤维增强混凝土（SFRC）行为的数值非线性程序。已经研究并适当考虑了所涉及的后裂纹机制，特别是张力软化和张力硬化。已经实现并讨论了不同的拉伸软化关系，一种基于微机械方法，另一种是通过反分析获得的，最后是通过Model Code 2010（MC2010）法则获得的。这些模型已与涂抹裂纹方法结合使用，以进行R / FRC结的有限元模拟，其特征是横截面和纤维体积分数不同。数值结果已经通过布雷西亚大学最近进行的关于R / FRC（以拉伸软化行为为特征）和RC关系的综合实验程序进行了验证。实验结果和数值结果之间的比较表明，涂抹模型也可以用于分析这种结构类型，在单轴应力状态下，作为离散方法的一种有价值的替代方法。

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