基于非局部微平面模型M7的混凝土非线性有限元分析

发布时间：2018-05-20 01:39

本文选题：微平面模型M + 非局部理论　；参考：《建筑结构学报》2017年02期

【摘要】：混凝土作为多相复合材料,其力学行为复杂多样,结构响应具有明显非线性,采用宏观本构模型精确描述存在较大难度。基于微观水平的混凝土本构模型——微平面模型M7,通过二次开发接口,将其嵌入具有较强非线性分析能力的通用有限元程序ABAQUS,对混凝土单轴压缩及拉伸、三轴压缩进行了模拟分析,通过与相关试验结果比较,验证了基于微平面模型子程序的有效性;为规避应变局部化引起的网格敏感性问题,将非局部理论引入微平面模型,研究了混凝土矩形面板与三点弯曲梁的应变软化问题。结果表明:微平面模型M7能够较好地模拟混凝土应力-应变全曲线过程,及多种应力状态下的力学行为;结合非局部理论的非局部微平面模型用于混凝土结构的有限元分析,不存在网格依赖性问题,能够给出合理的结构应变软化局部化响应,数值模拟结果合理可靠。
[Abstract]:As a multiphase composite material, the mechanical behavior of concrete is complex and diverse, and the structural response is obviously nonlinear, so it is difficult to describe accurately the macroscopic constitutive model. Based on the micro-level concrete constitutive model-micro-plane model M7, through the secondary development interface, it is embedded in Abaqus, a general finite element program with strong nonlinear analysis ability, for uniaxial compression and tension of concrete. In order to avoid the grid sensitivity caused by strain localization, the non-local theory is introduced into the micro-plane model, in order to avoid the grid sensitivity problem caused by strain localization, the non-local theory is introduced into the micro-plane model. The strain softening problem of concrete rectangular slab and three-point bending beam is studied. The results show that the microplane model M7 can simulate the whole stress-strain curve process of concrete and the mechanical behavior under various stress states, and the non-local micro-plane model can be used in the finite element analysis of concrete structure. There is no grid-dependent problem, and the local response of structural strain softening can be given, and the numerical simulation results are reasonable and reliable.
【作者单位】：天津大学水利工程仿真与安全国家重点实验室;
【基金】：国家自然科学基金创新研究群体科学基金项目(51321065);国家自然科学基金项目(51279126) 天津市自然科学基金项目(13JCQNJC06800) 内蒙古自治区交通运输厅科技项目(NJ-2014-1)
【分类号】：TU528

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