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为研究钢筋混凝土框架结构的连续倒塌受力机理,在角柱失效倒塌试验基础上,运用ABAQUS有限元软件对钢筋混凝土框架进行了连续倒塌仿真分析。考虑到角柱失效倒塌过程中地梁和对角区域的构件几乎没有破坏,建模中只在角柱区域建立了钢筋混凝土板;同时考虑到位移加载方式简单而且模型更易收敛,故仿真倒塌全程采用位移控制。通过仿真得到了结构的荷载-位移曲线、框架的位移曲线、钢筋和混凝土应力曲线、破坏形态等,并与试验结果进行对比。结果表明:仿真结果和试验结果基本一致;角柱失效时,框架经历了弹性阶段、塑性铰形成阶段和失效阶段;该仿真能够较好地模拟框架模型连续倒塌的过程,并且能揭示倒塌破坏过程的受力特点。
In order to study the continuous collapse mechanism of reinforced concrete frame structure, based on the failure test of corner column, the continuous collapse simulation analysis of reinforced concrete frame was carried out by ABAQUS finite element software. Taking into account the collapse of the corner column during the collapse of the beam and diagonal area of the components almost no damage, modeling only in the corner column area to establish a reinforced concrete slab; taking into account the displacement load is simple and the model more easily convergent, so the simulation of the collapse of the whole displacement control. Through the simulation, the load-displacement curve, the displacement curve of the frame, the stress curves of steel and concrete, the failure morphology and so on were obtained and compared with the experimental results. The results show that the simulation results are in good agreement with the experimental results. When the corner column fails, the frame undergoes the elastic phase, the plastic hinge formation phase and the failure phase. The simulation can well simulate the continuous collapse of the frame model and reveal the process of collapse and collapse Force characteristics.