一种新的混凝土各向异性弹塑性损伤本构模型及其数值实施 |
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引用本文: | 焦延涛,程立平. 一种新的混凝土各向异性弹塑性损伤本构模型及其数值实施[J]. 工程力学, 2022, 39(8): 122-137. DOI: 10.6052/j.issn.1000-4750.2021.04.0297 |
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作者姓名: | 焦延涛 程立平 |
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作者单位: | 华北水利水电大学水利学院,郑州450045;平顶山学院化学与环境工程学院,平顶山467000 |
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基金项目: | 华北水利水电大学高层次人才科研启动项目(40589) |
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摘 要: | 该文的目的是建立一种新的、相对简单的混凝土各向异性塑性损伤本构模型,以方便的模拟混凝土结构的破坏行为。为了更好地描述混凝土在拉、压荷载作用下的不同损伤机制,建立了拉、压不同的两种损伤演化方程,用于确定各向异性的拉、压损伤变量。另外,根据应变等效假设,假定有效构型和损伤构型的应变相等,该方法不仅大大简化了模型的推导过程,而且可方便的通过解耦算法进行有效应力和损伤及名义应力的计算,也即塑性部分计算可通过现有的隐式算法实现,损伤部分及名义应力的计算则可通过较为简便的显式算法实现,从而可大大提高计算效率。模型结果与试验结果的对比分析表明:该模型能较好地描述混凝土在三维应力状态下的非线性行为;对双边开口四点弯曲梁试件的模拟也表明:该模型能反应混凝土损伤各向异性的特点,计算结果相比ABAQUS软件自带的混凝土损伤塑性本构模型(CDP模型)更符合实际情况,计算效率也更高。
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关 键 词: | 混凝土 塑性-损伤模型 各向异性损伤 拉伸损伤 压缩损伤 |
收稿时间: | 2021-04-20 |
A NEW ANISOTROPIC PLASTIC-DAMAGE MODEL AND ITS NUMERICAL IMPLEMENTATION FOR PLAIN CONCRETE |
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Affiliation: | 1.School of Water Conservancy, North China University of Water Resources and Electric Power, Zhengzhou 450045, China2.College of Chemistry and Environmental Engineering, Pingdingshan University, Pingdingshan 467000, China |
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Abstract: | A new and relatively simple anisotropic plastic-damage constitutive model is developed to facilitate the numerical simulation of the failure of concrete structures. For better describe the different damage mechanisms of concrete under tensile and compressive loadings, two different damage evolution equations, being suitable for determining the anisotropic tensile and compressive damage variables, are established. Moreover, the strain equivalence hypothesis is used to assume that the strains in both the effective and nominal configurations are equal. Through this method, the deducing process of the model can be simplified, and the effective stress calculation and the damage evolution are able to be implemented by a decoupled algorithm. Thusly, the plastic part of the model can be implemented implicitly, and the damage part and nominal stress calculation can be implemented explicitly, which is convenient for numerical implementation. The model response is compared to a wide range of test results. The results show that the model is able to describe the nonlinear behavior of concrete in three-dimensional stress state well. The simulation of double-edge-notched (DEN) specimen shows that: the model can reflect the characteristics of concrete damage anisotropy. The results are more consistent with the actual situation, and the computational efficiency is also higher than that of the concrete damage plasticity (CDP) model provided by ABAQUS software. |
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