改进的混凝土弹塑性损伤本构

针对现有的混凝土弹塑性损伤本构模型的缺陷,利用能够反映混凝土拉压方向不同强度特性的Hsieh-Ting-Chen四参数屈服函数,基于热力学耗散原理提出了一种新的混凝土弹塑性损伤本构模型,并且进行单轴拉伸和单轴压缩下,应力-应变关系的数值试验。和其它混凝土弹塑性损伤本构模型相比,提出的弹塑性损伤本构模型有其优点:只有一个未知参数,其余的参数都和Hsieh-Ting-Chen混凝土四参数屈服函数的参数相同,易于确定未知参数;并且拉压损伤演化定律采用相同的计算公式,能够较好地反映混凝土在复杂应力状态下的拉压不同的损伤特性及应力-应变曲线。

Improved Elasto-plasticity Damage Constitutive Models for Concrete

In order to improve the limitation and lacuna of the traditional damage constitutive models for concrete, a new elasto-plasticity damage constitutive models for concrete was proposed based on the energy dissipation principle by using Hsieh-Ting-Chen four-parameter yield function that could reflect the different strength characteristics of concrete in tension and compression. Moreover, numerical test for concrete stress-strain relation under uniaxial tension and compression was given. Compared with other damage constitutive models, the proposed model contains only one unknown parameter and the other parameters can be found in Hsieh-Ting-Chen four-parameter yield function. And the same damage evolution law, which is used for tension and compression, is good for determining stress-strain constitutive and damage characteristic in complex stress state.