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首页> 外文会议>Strain Hardening Cementitious Composites (SHCC2-Rio). >IMPACTS OF PRINCIPAL STRESS ROTATION ON THE NONLINEARITY OF STRAIN-HARDENING CEMENTITIOUS COMPOSITES WITH FIBERS
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IMPACTS OF PRINCIPAL STRESS ROTATION ON THE NONLINEARITY OF STRAIN-HARDENING CEMENTITIOUS COMPOSITES WITH FIBERS

机译：主应力旋转对纤维硬化应变硬化水泥基复合材料非线性的影响

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摘要

An experimental program was conducted to investigate the effects of simultaneous opening-sliding of multiple cracks on the behaviour of strain-hardening cementitious composite plates. Newly proposed testing method was developed to reproduce possible rotating principal axis during the material strain-hardening. The experimental results showed the change in principal stress direction has a substantial impact on the macroscopic plate behaviours including multi-directional cracking pattern, and reductions in strength, ductility, and initial stiffness. A space-averaged constitutive model for this type of material was developed and further incorporated into FE analysis program. The model simulated reasonably various responses observed in the experiment and demonstrated the reductions observed were attributed to the lack of shear transfer across the multiple cracks. Further analyses of shear-critical R/SHCC panels and beams were carried out and confirmed the applicability of the model to simulate the behaviours at structural levels. Finally, this paper briefly presents our recent attempt to improve the structural performance with robust SHCC material under stress field rotation.
机译：进行了一个实验程序，以研究多个裂纹同时打开-滑动对应变硬化水泥基复合板行为的影响。开发了新提出的测试方法，以重现材料应变硬化过程中可能的旋转主轴。实验结果表明，主应力方向的变化对宏观板的行为具有重大影响，包括多向裂纹模式，以及强度，延展性和初始刚度的降低。开发了这种材料的空间平均本构模型，并将其进一步纳入有限元分析程序。该模型合理地模拟了实验中观察到的各种响应，并证明观察到的减少归因于跨多个裂纹的剪切传递的缺乏。进行了对剪力至关重要的R / SHCC面板和梁的进一步分析，并证实了该模型在结构水平上模拟行为的适用性。最后，本文简要介绍了我们最近在应力场旋转下使用坚固的SHCC材料改善结构性能的尝试。

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