常见动态混凝土材料模型基本力学特征对比分析
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摘要
材料本构模型的选择和使用,一直是制约混凝土构件动态损伤模拟技术发展的重要因素之一。基于通用有限元软件LS-DYNA,对其中2种常用的混凝土材料模型(混凝土损伤模型和混凝土连续面盖帽模型)的基本力学行为进行了对比分析。研究结果表明,混凝土损伤模型和连续面盖帽模型在基本应力应变关系、网格敏感性和应变率效应等方面均存在明显的差异。因此,采用这些材料模型进行有限元分析时,必须经过严格的试验验证,特别是在模型校正和后续参数分析时,应采用相同或相近的网格尺寸,以消除网格敏感性的影响。
The selection and application of the material constitutive model has always been one of the most important factors that restrict the development of the damage simulation of concrete members under dynamic loading. Based on the general finite element software LS-DYNA, a comparison and an analysis hare been made of the basic mechanical behavior of two kinds of commonly-used concrete material models(concrete damage model and continuous surface cap model). The experimental results show that there are significant differences in the basic stressstrain relationship, grid sensitivity and strain rate effect between the concrete damage model and continuous surface cap model. Hence, there should be a strict experimental verification in the process of the finite element analysis of the material model; specifically, in order to eliminate the effects of the grid sensitivity, the same or similar grid size should be used for the analysis of the model validation process and follow-up parameters.
The selection and application of the material constitutive model has always been one of the most important factors that restrict the development of the damage simulation of concrete members under dynamic loading. Based on the general finite element software LS-DYNA, a comparison and an analysis hare been made of the basic mechanical behavior of two kinds of commonly-used concrete material models(concrete damage model and continuous surface cap model). The experimental results show that there are significant differences in the basic stressstrain relationship, grid sensitivity and strain rate effect between the concrete damage model and continuous surface cap model. Hence, there should be a strict experimental verification in the process of the finite element analysis of the material model; specifically, in order to eliminate the effects of the grid sensitivity, the same or similar grid size should be used for the analysis of the model validation process and follow-up parameters.
引文
[1]Livermore Software Technology Corporation.LS-DYNA Keyword User’s Manual[EB/OL].[2017-01-05].http://www.dynasupport.com/manuals/ls-dyna-manuals/LSDYNA_Keyword_Manual_971_Rev5-beta.pdf.
[2]MAGALLANES J M,WU Y,MALVAR L J,et al.Recent Improvements to Release III of the K&C Concrete Model[EB/OL].[2017-01-05].http://www.dynalook.com/international-conf-2010/Simulation-1-4.pdf.
[3]MALVAR L J,CRAWFORD J E,WESEVICH J W,et al.A Plasticity Concrete Material Model for DYNA3D[J].International Journal of Impact Engineering,1997,19(9/10):847-873.
[4]MURRAY Y D.Users Manual for LS-DYNA Concrete Material Model 159[M].Colorado Springs:APTEK,2007:1-77.
[5]MURRAY Y D,ABU-ODEH A Y,BLIGH R P.Evaluation of LS-DYNA Concrete Material Model159[M].Colorado Springs:APTEK,2007:1-190.
[6]MALVAR L J,CRAWFORD J E.Dynamic Increase Factors for Concrete[EB/OL].[2017-01-05].http://dtic.mil/get-tr-doc/pdf?AD=ADA500715&Location=U2&doc=Get TRDoc.pdf.
[7]BRARA A,KEPACZKOJ R.Fracture Energy of Concrete at High Loading Rates in Tension[J].International Journal of Impact Engineering,2007,34(3):424-435
[2]MAGALLANES J M,WU Y,MALVAR L J,et al.Recent Improvements to Release III of the K&C Concrete Model[EB/OL].[2017-01-05].http://www.dynalook.com/international-conf-2010/Simulation-1-4.pdf.
[3]MALVAR L J,CRAWFORD J E,WESEVICH J W,et al.A Plasticity Concrete Material Model for DYNA3D[J].International Journal of Impact Engineering,1997,19(9/10):847-873.
[4]MURRAY Y D.Users Manual for LS-DYNA Concrete Material Model 159[M].Colorado Springs:APTEK,2007:1-77.
[5]MURRAY Y D,ABU-ODEH A Y,BLIGH R P.Evaluation of LS-DYNA Concrete Material Model159[M].Colorado Springs:APTEK,2007:1-190.
[6]MALVAR L J,CRAWFORD J E.Dynamic Increase Factors for Concrete[EB/OL].[2017-01-05].http://dtic.mil/get-tr-doc/pdf?AD=ADA500715&Location=U2&doc=Get TRDoc.pdf.
[7]BRARA A,KEPACZKOJ R.Fracture Energy of Concrete at High Loading Rates in Tension[J].International Journal of Impact Engineering,2007,34(3):424-435