混凝土结构损伤的各向同性和各向异性描述

Stéphanie Fichant, C. Borderie, G. Pijaudier-Cabot
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引用次数: 139

摘要

为了预测混凝土和钢筋混凝土结构的响应和破坏模式,在计算分析中经常采用标量损伤模型。然而,在大多数情况下,损伤不是各向同性的,而是有优先方向的。因此,对于描述具有强几何定向的退化过程的各向同性、标量损伤模型的适用性和适用范围存在许多问题。为了评估这种简化假设的局限性,提出了一项比较研究。用于此目的的本构关系源自同一类模型,并逐渐增强了对损伤的描述。将标量损伤模型与描述损伤诱导正交异性的另一种模型进行了比较,并考虑了正交异性主轴旋转的可能性。两种模型都考虑了裂纹闭合效应和塑性损伤耦合。对弯梁、压剪和拉剪混凝土面板进行了结构分析。虽然它可能看起来过于简单,但当破坏主要是由于单轴扩展时,标量损伤模型提供了准确的预测。裂缝闭合引入了一个额外的各向异性,这在压剪问题中很重要。最后,当破坏是由多轴扩展引起时,损伤引起的各向异性似乎很重要,例如在剪切张力问题中。版权所有©1999 John Wiley & Sons, Ltd
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Isotropic and anisotropic descriptions of damage in concrete structures
Scalar damage models are very often implemented in computational analyses in order to predict the response and failure modes of concrete and reinforced concrete structures. In most situations, however, damage is not isotropic but has preferential directions. Therefore, there have been many questions about the pertinence and range of applicability of isotropic, scalar, damage models for describing a degradation process which is strongly geometrically oriented. In order to assess what are the limitations of such a simplifying assumption, a comparative study is presented. The constitutive relations used for this purpose derive from the same class of models with a gradual enhancement of the description of damage. The scalar damage model is compared to another model where damage-induced orthotropy is described, with the possibility of rotation of the principle axes of orthotropy. Both models incorporate crack closure effects and a plasticity damage coupling. Structural analyses on bending beams, compression-shear and tension-shear concrete panels are presented. Although it may appear to be simplistic, the scalar damage model provides accurate predictions when failure is mainly due to uniaxial extension. Crack closure introduces an additional anisotropy which is important in compression-shear problems. Finally, damage-induced anisotropy seems important when failure is due to multiaxial extensions, such as in shear-tension problems. Copyright © 1999 John Wiley & Sons, Ltd.
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