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Constitutive Law of Concrete Under Multiaxial Compression Considering Strain Localization in Strain Softening Region

考虑应变软化区应变局部化的多轴压缩混凝土本构定律

基本信息

批准号：
63550409
负责人：
TANIGAWA Yasuo
金额：
$ 1.41万
依托单位：
Mie University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1989
项目状态：
已结题

项目摘要

In this study, the constitutive relationships of concrete under multiaxial compression including strain softening region were examined both experimentally and analytically. The results obtained are summarized as follows.1. It is reasonable to treat the constitutive law of confined concretes as that of plain concrete under multiaxial stress state, judging from the view point of failure mechanism. However, the experimental data concerning strain softening of the concrete under multiaxial compressive stress state are still inadequate to establish the general law.2. The stress-strain relationships of concrete specimens of various shapes are successfully associated with each other, using the proposed idealized failure zone model, regardless of the magnitude of lateral stress and compressive Strength of concrete.3. The plastic deformation capacity of high-strength concrete under multiaxial compressive stress state can be treated as the extension of that of normal strength concrete. In this study, the earlier proposed model for representing the stress-strain behavior in the maximum compressive stress axis was extended for the high-strength concrete.4. It is possible to represent the effects of various factors (such as magnitude of lateral stress, imbalance of two lateral stresses, pitch of loading area of lateral stress, loading path of lateral stress, and shape of concrete specimen) in the form of the reducing coefficient of the lateral stress. In this study, the coefficients were numerically represented, based on the experimental data.5. It is not appropriate to use the loading surface defined in the stress space for modeling the strain softening of concrete. Therefore, a new type of constitutive model was proposed in this study, based on the plasticity theory defined in the strain space.6. It is demonstrated that the proposed constitutive model is quite useful to predict the strain softening behavior of concrete under triaxial compression state.

本文对混凝土在多轴压缩条件下包括应变软化区域的本构关系进行了实验和分析研究。所得结果总结如下：1。从破坏机理上看，将约束混凝土的本构规律视为素混凝土在多轴应力状态下的本构规律是合理的。然而，关于混凝土在多轴压应力状态下应变软化的实验数据还不足以建立一般规律。2 .无论混凝土的侧应力和抗压强度大小如何，采用所提出的理想破坏区模型，各种形状的混凝土试件的应力-应变关系都能成功地相互关联。高强混凝土在多轴压应力状态下的塑性变形能力可以看作是普通强度混凝土塑性变形能力的延伸。在本研究中，将先前提出的在最大压应力轴上表示应力-应变行为的模型扩展到高强混凝土。可以用侧应力折减系数的形式来表示各种因素（如侧应力大小、两侧应力不平衡、侧应力加载区间距、侧应力加载路径、混凝土试件形状等）的影响。在本研究中，以实验数据为基础，对系数进行了数值表示。用应力空间中定义的加载面来模拟混凝土的应变软化是不合适的。因此，本研究提出了一种基于应变空间塑性理论的新型本构模型。结果表明，所建立的本构模型对于预测混凝土在三轴压缩状态下的应变软化行为是非常有用的。