反映混凝土单边效应的弹塑性损伤本构模型及应用
发布时间：2019-01-10 18:36
【摘要】：为了尽可能有效和准确地描述混凝土材料的非线性力学特性,在研究国内外混凝土损伤本构模型的基础上,基于连续介质损伤力学和不可逆热力学的理论框架,采用统一强度理论作为屈服破坏准则,分别定义拉、压双标量损伤来考虑材料的拉、压迥异特性,同时引入反向加载影响因子以修正拉压交替循环加载时材料的单边效应,以及多轴应力状态下拉、压损伤累积的相互影响,最终采用显式积分算法建立了一种改进的混凝土弹塑性损伤本构模型.不同素混凝土加载试验模拟结果初步验证了建议模型的有效性,而通过对含I型裂缝的混凝土简支梁试验进行数值分析,结果表明,所得的荷载-挠度曲线与试验结果吻合良好,进一步检验了模型应用于结构非线性分析的有效性.
[Abstract]:In order to describe the nonlinear mechanical properties of concrete materials as effectively and accurately as possible, based on the theoretical framework of continuum damage mechanics and irreversible thermodynamics, the damage constitutive models of concrete at home and abroad are studied. The unified strength theory is used as the yield failure criterion, and the tensile and compression double scalar damage is defined to consider the different properties of the material, and the influence factor of reverse loading is introduced to correct the one-sided effect of the material under the alternate cyclic loading of tension and compression. Finally, an improved elastoplastic damage constitutive model of concrete is established by using explicit integral algorithm. The effectiveness of the proposed model is preliminarily verified by the simulation results of different plain concrete loading tests. The numerical analysis of simply supported concrete beams with I-type cracks shows that, The obtained load-deflection curves are in good agreement with the experimental results, which further verify the validity of the model applied to the nonlinear analysis of structures.
【作者单位】： 西北农林科技大学水利与建筑工程学院;
【基金】：国家自然科学基金(面上项目)(51379178)~~
【分类号】：TU528
本文编号：2406655
[Abstract]:In order to describe the nonlinear mechanical properties of concrete materials as effectively and accurately as possible, based on the theoretical framework of continuum damage mechanics and irreversible thermodynamics, the damage constitutive models of concrete at home and abroad are studied. The unified strength theory is used as the yield failure criterion, and the tensile and compression double scalar damage is defined to consider the different properties of the material, and the influence factor of reverse loading is introduced to correct the one-sided effect of the material under the alternate cyclic loading of tension and compression. Finally, an improved elastoplastic damage constitutive model of concrete is established by using explicit integral algorithm. The effectiveness of the proposed model is preliminarily verified by the simulation results of different plain concrete loading tests. The numerical analysis of simply supported concrete beams with I-type cracks shows that, The obtained load-deflection curves are in good agreement with the experimental results, which further verify the validity of the model applied to the nonlinear analysis of structures.
【作者单位】： 西北农林科技大学水利与建筑工程学院;
【基金】：国家自然科学基金(面上项目)(51379178)~~
【分类号】：TU528
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