Analysis of Nonlinear Mechanical Properties of a Cement-Based Fiber Reinforced Material by Mesoscopic Structural Analysis Method

在建立纤维增强材料的本构关系时，必须了解纤维与基体之间的非线性粘结行为。本研究的目的是获得基础数据，以开发一个通用的本构关系的基础上的粘结性能的每一个嵌入在高强度钢纤维混凝土（SFRC）的钢纤维。本研究的主要内容如下：1.钢纤维混凝土变形性能试验：以钢纤维类型（直纤维、弯钩纤维和锚固纤维）和纤维夹角（0 °、30 °、45 °、60 °）为参数，研究了钢纤维在单轴拉伸和剪切下的性能。阐明了纤维类型和纤维夹角对力-位移关系的影响.钢纤维变形特性建模：采用多线性模型模拟了钢纤维在单轴拉伸和剪切作用下的力-位移关系.纤维增强材料模拟方法的开发：通过将使用微观结构单元的模拟方法与区域分解法相结合，可以开发出适合并行计算的分析方法。

In case of modeling the constitutive relationship of fiber reinforced material, it is imporant to know the nonlinear bond behavior between fiber and matrix. The objective of this study is to obtain basic data to develop a general constitutive relationship based on the bond behavior of each steel fiber embedded in high strength steel fiber reinforced concrete (SFRC). The summary of this study is shown as follows.1. Experiment on deformational property of SFRC :The behavior of steel fiber subject to uniaxial tension and shear was investigated with fiber type (straight, hooked and anchored fibers) and fiber angle (0,30,45,60 degrees) as parameters. The effect of fiber type and fiber angle on the force-displacement relationship was clarified.2. Modeling of deformational property of steel fiber :The force-displacement relationships of steel fiber under uniaxial tension and shear were modeled by the multilinear model.3. Development of simulation method for fiber reinforced material :It was confirmed that an analysis method suitable for parallel computation can be developed by combining the simulation method using microstructural unit elements with the domain decomposition method.