微平面模型与经典混凝土理论模型的比较  

Comparison between microplane model and classical concrete theoretical model

作　　者：鞠进贤 陆华 王水平 

机构地区：[1]海军驻上海电站辅机厂军事代表室,上海200090

出　　处：《计算机辅助工程》2012年第4期60-64,68,共6页Computer Aided Engineering

摘　　要：针对在混凝土非线性分析时所采用的宏观本构模型中,没有考虑混凝土软化阶段或考虑不当,以及在多轴受力情况下宏观模型不能很好地模拟混凝土受力状态的问题,基于微平面理论,利用MATLAB编写混凝土材料的非线性本构关系程序,从理论和计算结果两方面与经典的基于应力张量及其不变量的本构模型进行比较.比较结果表明,在弹性变形阶段,经典理论模型和微平面模型计算结果与试验结果无明显区别;在非弹性变形阶段,经典理论模型与微平面模型有较大的差异,后者与试验结果吻合较好.微平面理论在混凝土三向受力和软化阶段更能准确地描述混凝土材料本构关系,且本构关系更简单、清晰.As to the problems that the softening stage is not considered or considered unsuitable in nonlinear analysis of concrete by macroscopic constitutive model, and macroscopic constitutive model can not perform a good simulation on concrete stress states under multi-axial force-bearing situation, the nonlinear constitutive relationship program is fulfilled in MATLAB based on microplane theory. Then the theory and the computing results are compared with the classical constitutive model based on stress tensor and its invariant. The comparative results show that, there is no significant difference between the test results and the calculation results of classical theory model and the microplane model in elastic deformation stage; the difference is larger in non-elastic deformation stage, and the latter consists with the test results better. The constitutive relation of concrete material can be described more accurately in three direction force-bearing and softening stage, and the constitutive relation is more simple and clearer.

关 键 词：混凝土 非线性分析 微平面 本构关系 动态约束 

分 类 号：TU528[建筑科学—建筑技术科学]