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双标量描述下土的弹性非线性损伤模型 被引量:1
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作者 雷孝章 何思明 唐学文 《四川大学学报(工程科学版)》 EI CAS CSCD 北大核心 2007年第2期20-24,共5页
根据土的变形特点,采用双标量描述土的各向同性弹性损伤,将土看成是由两种材料组成的复合体,一种材料的柔度矩阵仅与土的弹性模量有关,而另一种材料的柔度矩阵仅与土的剪切模量有关。分别定义各自的损伤变量,并根据等效应力原理建立各... 根据土的变形特点,采用双标量描述土的各向同性弹性损伤,将土看成是由两种材料组成的复合体,一种材料的柔度矩阵仅与土的弹性模量有关,而另一种材料的柔度矩阵仅与土的剪切模量有关。分别定义各自的损伤变量,并根据等效应力原理建立各自的损伤本构方程,最后通过合成获得了土的弹性非线性损伤本构方程,并根据土的三轴试验结果确定损伤演化方程,在此基础上建立了一个土的弹性非线性各向同性损伤模型。将其运用到地基沉降计算中,与实测结果进行比较,验证了本模型的正确性。 展开更多
关键词 双标量损伤 各向同性 弹性非线性损伤模型
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Practical elasto-plastic damage model for dynamic loading and nonlinear analysis of Koyna concrete dam 被引量:2
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作者 齐虎 李云贵 吕西林 《Journal of Central South University》 SCIE EI CAS 2013年第9期2586-2592,共7页
The elasto-plastic damage model for concrete under static loading,previously proposed,was extended to account for the concrete strain-rate through viscous regularization of the evolution of the damage variables.In ord... The elasto-plastic damage model for concrete under static loading,previously proposed,was extended to account for the concrete strain-rate through viscous regularization of the evolution of the damage variables.In order to describe the energy dissipation by the motion of the structure under dynamic loading,a damping model which only includes stiffness damp stress was proposed and incorporated into the proposed rate dependent model to consider the energy dissipation at the material scale.The proposed model was developed in ABAQUS via UMAT and was verified by the simulations of concrete specimens under both tension and compression uniaxial loading at different strain rates.The nonlinear analysis of Koyna concrete dam under earthquake motions indicates that adding stiffness damp into the constitutive model can significantly enhance the calculation efficiency of the dynamic implicit analysis for greatly improving the numerical stability of the model.Considering strain rate effect in the model can affect the displacement reflection of this structure for slightly enhancing the displacement of the top,and can improve the calculation efficiency for greatly reducing the cost time. 展开更多
关键词 stiffness damp strain-rate sensitivity CONCRETE constitutive model
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