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Modeling of smart concrete beams with shape memory alloy actuators

机译：使用形状记忆合金作动器的智能混凝土梁建模

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摘要

In the present work, a computational strategy for the modeling of reinforced concrete beams with SMA actuators for cracks repair is developed. In particular, for the concrete, an original transition damage-fracture technique is proposed in order to simulate the microcrack arising, their coalescence and, finally, the macrocrack development. Microcracks are modeled adopting a nonlocal damage and plasticity approach, which is able to consider the tensile and compressive damaging, accumulation of irreversible strains and the unilateral phenomenon. Macrocracks are modeled using a cohesive zone interface which accounts for the mode I, mode II and mixed mode of damage, the unilateral contact and the friction effects. The interface models the transition from the continuum damage (simulating the presence of microcracks) to fracture. A uniaxial SMA model able to reproduce both the pseudo-elastic behavior and the shape memory effect is adopted for the reinforcing SMA bars. Finite element simulations are developed in order to reproduce the behavior of smart concrete beams subjected to three-point bending experimental tests available in literature (Kuang and Ou, 2008, Daghia et al., 2011). The construction phases of the beam are simulated and the loading history, consisting in three-point bending tests, are reproduced; in particular, the repairing phase due to pseudo-elastic behavior and shape memory effect is reproduced. Numerical results are compared with experimental data to validate the computational strategy.
机译：在目前的工作中，开发了一种用于SMA致动器的钢筋混凝土梁建模的计算策略，用于裂缝修复。特别地，对于混凝土，提出了一种原始的过渡破坏-断裂技术，以模拟微裂纹的产生，它们的合并以及最终的大裂纹的发展。对微裂纹的建模采用了非局部损伤和可塑性方法，该方法能够考虑拉伸和压缩损伤，不可逆应变的积累和单方面现象。使用内聚区域界面对宏观裂纹进行建模，该界面考虑了损伤的模式I，模式II和混合模式，单边接触和摩擦效果。该界面模拟了从连续损伤（模拟微裂纹的存在）到断裂的过渡。钢筋SMA钢筋采用能够同时再现拟弹性行为和形状记忆效应的单轴SMA模型。为了再现智能混凝土梁在三点弯曲实验测试中的行为，开发了有限元模拟（Kuang和Ou，2008； Daghia等，2011）。模拟了梁的施工阶段，并再现了包括三点弯曲试验在内的载荷历史。特别地，再现了由于伪弹性行为和形状记忆效应引起的修复阶段。将数值结果与实验数据进行比较，以验证计算策略。

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  • 来源
    《Engineering Structures》 |2014年第15期|63-72|共10页
  • 作者

    S. Malagisi; S. Marfia; E. Sacco; J. Toti;

  • 作者单位

    DiCeM, Department of Civil and Mechanical Engineering, University of Cassino and Southern Lazio, Italy;

    DiCeM, Department of Civil and Mechanical Engineering, University of Cassino and Southern Lazio, Italy;

    DiCeM, Department of Civil and Mechanical Engineering, University of Cassino and Southern Lazio, Italy;

    Department of Civil, Construction-Architectural and Environmental Engineering, University of L'Aquila, Italy;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Smart concrete; Shape memory alloy; Damage-fracture coupling;

    机译：智能混凝土;形状记忆合金;损伤-断裂耦合;

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