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基于ABAQUS装配式建模构架,提出了一种砌体结构的简化细观模型。该建模方法将块体砂浆界面及砂浆层统一采用块体间的界面来代替。界面属性包括法向和切向的力学参数,用来模拟砌体的剪压及受拉行为。界面的法向受拉采用粘性力学参数赋值,并通过与轴心受拉本构模型的等效,推导得出控制界面损伤演化速率的无量纲指数α的计算方程。剪压复合受力模型基于剪摩理论建立,通过粘性属性和库伦摩擦赋值。当剪压复合受力构件处于高轴压比时,通过块体的非线性属性实现了主压应力为主控的损伤阀值。按照该方法进行剪压相关性和砖墙剪切失效的试验仿真模拟,模拟得出的失效形态及力位移曲线与试验结果基本相符。
Based on the ABAQUS assembly modeling framework, a simplified mesoscopic model of masonry structure is proposed. The modeling method uses the interface between the mortar body and the mortar layer uniformly to replace the interface between the two bodies. Interface properties include normal and tangential mechanical parameters used to simulate the shear and tension behavior of masonry. The normal tension of the interface is assigned by the viscous mechanics parameter, and the equivalent equation of the constitutive model of the axial tension is derived to calculate the dimensionless exponent α of the damage rate of the interface. Shear compression composite stress model based on the theory of shear friction established by the viscous properties and Coulomb friction assignment. When the shear-compression composite member is at high axial compression ratio, the main compression stress is the main control damage threshold through the nonlinear properties of the block. According to this method, the simulation of shear-shear correlation and shear failure of brick wall is simulated. The failure mode and force displacement curve obtained by simulation are in good agreement with the experimental results.