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A macroscopic gradient-enhanced damage model for deformation behavior of concrete under cyclic loadings
Archive of Applied Mechanics ( IF 2.8 ) Pub Date : 2020-02-05 , DOI: 10.1007/s00419-020-01669-4
Ajmal Hasan Monnamitheen Abdul Gafoor , Dieter Dinkler

Concrete materials show a very complex macroscopic deformation behavior under tension and compression, accompanied by crack opening and crack closing phenomena under cyclic loading. The continuum damage mechanics offers a promising framework for the description of the damage deformation behavior. This paper proposes a continuum damage model, which is formulated based on energy equivalence using a unified equivalent strain. The evolution of isotropic damage is governed by two independent history variables to describe the crack opening and closing behavior, i.e., unilateral behavior, of concrete. The evolution of damage and inelastic strains are described by a single damage function and a modified failure surface, respectively. Moreover, the implicit gradient method is applied to the equivalent strains to achieve proper localization of deformation. The stiffness recovery and crack opening/closing mechanisms are simulated considering the thermodynamically consistent framework. Validation of numerical results with experimental data and the previous models demonstrates the efficiency of the model to simulate concrete behavior under monotonic and cyclic/reverse loadings.

中文翻译:

循环荷载作用下混凝土变形行为的宏观梯度增强损伤模型

混凝土材料在拉伸和压缩下表现出非常复杂的宏观变形行为,并在循环载荷下伴随着开裂和开裂现象。连续损伤力学为描述损伤变形行为提供了一个有希望的框架。本文提出了一种连续损伤模型,该模型是基于能量当量并使用统一的等效应变建立的。各向同性损伤的演变受两个独立的历史变量控制,这些变量描述了混凝土的裂缝开合行为,即单边行为。破坏和非弹性应变的演化分别由单个破坏函数和修改后的破坏面描述。此外,将隐式梯度方法应用于等效应变以实现变形的适当定位。考虑到热力学一致的框架,对刚度恢复和裂纹开/关机理进行了模拟。用实验数据和以前的模型对数值结果进行验证,证明了该模型在单调和循环/反向荷载下模拟混凝土行为的效率。
更新日期:2020-02-05
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