【摘要】 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。更多还原

【Abstract】 Based on the modular modeling framework of ABAQUS program,a simplified mesoscopic model is proposed for masonry structure.The mortar-joint and bond were replaced by a single interface.Shearcompression behaviour and tension behaviour were modeled through the normal and tangential mechanics properties of interface.Sticking mechanics property was adopted to model tensile behavior,and the evolution indexαof bonding soft was obtained by equivalent with axial tensile constitutive express.Based on shear-friction theory,shear-compression model was conducted by sticking mechanics and coulomb friction,and through the nonlinear properties of block,the principal compression stress was adopted as the master damage threshold under high axial compression ratio.Simulation of the shear-compression relationship and a brick wall model with shear failure were conducted,and the corresponding failure modes and curves were similar with that theory and test results.更多还原