【摘要】 目的分析带边框偏心大开洞剪力墙在水平荷载作用下的抗剪机理和破坏形态.方法方法应用有限元软件ABAQUS对一片三层带边框偏心大开洞钢筋混凝土剪力墙进行了非线性有限元推覆分析,研究了混凝土剪胀角参数取值对计算结果的影响.基于水平荷载-整体变形角关系、剪应力的传递和分配情况重点分析了正反向加载时带边框偏心大开洞剪力墙的受力特性.结果与试验结果比较表明有限元分析能较好地反映剪力墙的裂缝开展和损伤过程,估算正反向加载下的整体抗侧刚度和极限承载力.在弹性阶段,剪胀角对剪力墙承载力影响很小,进入塑性阶段后,承载力随剪胀角增大有所提高.洞口的偏心设置导致了正反向加载时不同的剪力传递和分配机理以及极限承载力的差异.结论对于带边框柱的偏心大开洞剪力墙结构,数值模拟应合理选取剪胀角参数,工程设计应合理选择边柱截面和配筋率,以防地震作用下边柱剪切破坏.更多还原

【Abstract】 Using finite element program ABAQUS,nonlinear FEM analysis under lateral load is performed on a three-story RC structural wall with large eccentric openings in order to investigate its shear-resisting mecha-nism and failure mode.The influence of concrete dilation angle on simulation results is discussed.Based on lateral load-drift angle relation as well as the shear stress transformation and distribution in wall and side columns,the work mechanism of RC structural wall with large eccentric openings in positive and negative loading direction is analyzed.Compared with low-cycle quasi-static test results,FEM analysis can well observe the crack-developing and failure process of the structural wall,and calculate shear-resisting stiffness and strength capacity in positive and negative loading directions.In the elastic phase,dilation angle has little influence on the strength capacity of structural wall,while in the plastic phase,the strength capacity increases with the increased dilation angle.Eccentric openings lead to different shear transfer and distribution mechanism in positive and negative loading directions.In conclusion,a reasonable value of the dilation angle ought to be set in structural wall numerical simulation.Moreover,the section size and reinforcement ratio of side columns in design should be to carefully selected to prevent shear failure under the earthquake effect.更多还原