模型再生混凝土单轴受压静力与疲劳性能数值仿真

发布时间：2018-04-16 23:27

本文选题：模型再生混凝土 + 单轴受压　；参考：《东南大学学报(自然科学版)》2016年03期

【摘要】：为了探讨再生混凝土中各相力学性能对其宏观力学性能的影响、寻找改善再生混凝土静力与疲劳性能的有效途径,基于ABAQUS软件建立了九骨料模型再生混凝土的有限元模型,并对各相材料赋予不同的损伤本构.分别采用显式准静态分析步和直接循环分析步对九骨料模型再生混凝土的单轴受压静力和低周疲劳加载进行数值模拟,并将静力性能仿真结果与试验结果进行对比.变参数分析结果表明:静力性能仿真结果与试验结果吻合较好;模型再生混凝土在界面过渡区会产生明显的应力集中现象,导致界面区砂浆塑性变形加剧,促使裂纹产生和扩展;随着再生粗骨料取代率的降低,模型再生混凝土的单轴受压强度和峰值应变逐渐增大;随着新砂浆强度的提高,模型再生混凝土的单轴受压强度逐渐增大;模型再生混凝土的疲劳性能较再生混凝土低,且应力-疲劳寿命曲线的趋势与普通混凝土相近.
[Abstract]:In order to investigate the influence of mechanical properties of different phases on the macroscopic mechanical properties of recycled concrete and to find an effective way to improve the static and fatigue properties of recycled concrete, a finite element model of recycled concrete with nine aggregate models was established based on ABAQUS software.Different damage constitutive laws are given to different phase materials.The static loading and low cycle fatigue loading of recycled concrete under uniaxial compression were simulated by explicit quasi-static analysis and direct cyclic analysis, respectively, and the static performance simulation results were compared with the experimental results.The results of variable parameter analysis show that the static performance simulation results are in good agreement with the experimental results, and the stress concentration of model recycled concrete in the interfacial transition zone is obvious, which leads to the increase of plastic deformation of mortar in the interfacial zone.With the decrease of replacement rate of recycled coarse aggregate, the uniaxial compressive strength and peak strain of model recycled concrete increase gradually, and the strength of new mortar increases with the increase of new mortar strength.The uniaxial compressive strength of model recycled concrete increases gradually, and the fatigue performance of model recycled concrete is lower than that of recycled concrete, and the trend of stress-fatigue life curve is similar to that of ordinary concrete.
【作者单位】：同济大学建筑工程系;
【基金】：国家自然科学基金杰出青年科学基金资助项目(51325802)
【分类号】：TU528

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