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基于细观尺度模型,研究了钢筋混凝土结构在荷载作用下的裂缝扩展情况并进行了数值仿真.首先,建立了混凝土结构的两相复合材料分析模型;其次,通过引入空间相关系数,对既有的Weibull力学参数分布模型进行了改进,使之体现单元之间力学性质的相关性;随后,构建混凝土及钢筋的本构方程,考虑到求解效率,利用应变能密度等效准则对混凝土三折线本构关系进行了简化;然后基于ANSYS平台开发了裂缝扩展模拟程序模块,通过引入裂缝贯通监控因子,对相互贯通后的裂缝实行自动化处理,提高了仿真的鲁棒性.为验证本文方法的有效性,将数值分析结果与3根不同剪跨比的钢筋混凝土简支梁加载后的裂缝开展情况进行了对比,模拟结果与试验现象吻合较好.
Based on the meso-scale model, the crack propagation of reinforced concrete structures under load is studied and numerical simulation is carried out.Firstly, a two-phase composite material analysis model of concrete structures is established. Secondly, by introducing the spatial correlation coefficient, Weibull mechanical parameter distribution model is improved to reflect the mechanical properties of the unit correlation; then, to build the constitutive equation of concrete and steel, taking into account the efficiency of the solution, the use of equivalent energy density criteria for concrete triad line Then the crack extension simulation program module was developed based on ANSYS platform. Through the introduction of the crack through monitoring factor, the crack after mutual penetration was automatically processed to improve the robustness of the simulation.In order to verify the effectiveness of the proposed method The results of numerical analysis are compared with those of three simple RC beams with different shear-span ratios after loading. The simulation results are in good agreement with the experimental ones.