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首页> 外文会议>International Seminar on Composite Materials in Concrete Construction; Sep 5-6, 2002; Scotland, UK >CONSTITUTIVE MODEL FOR THE STRESS-STRAIN RESPONSE OF FIBRE REINFORCED CONCRETE IN COMPRESSION
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CONSTITUTIVE MODEL FOR THE STRESS-STRAIN RESPONSE OF FIBRE REINFORCED CONCRETE IN COMPRESSION

机译：纤维增强混凝土受压应力本构模型

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摘要

Using an extensive database of test results a constitutive model of the compressive stress-strain response of fibre-reinforced concrete is developed. The experimental databank includes test specimens with a variety of fibre type and volumetric content. The model relates mechanical resistance at any level of axial deformation to damage buildup. Expansion in the microstructure due to crack initiation and propagation is used in the model as a measure of damage. Initiation of a post-peak descending branch in the stress-strain response is associated with the occurrence of instability in the specimen structure; in this modelling framework, fibres provide kinematic restraint to dilation in a manner analogous to conventional passive confinement. The role of fibres is evaluated through indices of mechanical behaviour such as the deformation capacity of the material, whereas the model is expressed mathematically through the mechanical properties of the fibres, the volumetric fraction of fibres and the intrinsic properties of the mortar/concrete matrix.
机译：使用广泛的测试结果数据库，开发了纤维增强混凝土的压应力-应变响应本构模型。实验数据库包括具有各种纤维类型和体积含量的试样。该模型将任何轴向变形水平下的机械阻力与损伤累积联系起来。在模型中，由于裂纹的产生和扩展而导致的微观结构膨胀被用作损伤的量度。应力-应变响应中峰后下降分支的开始与试样结构的不稳定性有关。在此建模框架中，纤维以类似于常规被动约束的方式为扩张提供了运动学上的约束。纤维的作用通过机械性能指标（例如材料的变形能力）进行评估，而模型则通过纤维的机械性能，纤维的体积分数和砂浆/混凝土基体的固有性能进行数学表达。

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