混凝土框架子结构角柱快速移除数值分析

Numerical Analysis on Corner Column Sudden Removal of RC Frame Substructure

研究了钢筋混凝土(RC)框架子结构在角柱突然失效模式下剩余结构的动力响应.依据Qian等完成的角柱快速移除动力试验,利用大型有限元软件ABAQUS/Explicit建立了精细化的有限元模型.在有限元模型中考虑了钢筋混凝土材料的应变率效应,并进行了现场试验的全过程加载模拟,模拟获得的位移响应曲线和破坏模式与现场试验吻合良好,较好地模拟了混凝土框架子结构角柱快速移除试验的全过程.在成功进行了模型校验的基础上,分析了角柱的失效时间和横向水平约束刚度对结构动力响应的影响,结果表明,延长结构的失效时间和增大横向水平约束刚度均能够有效地提高结构的抗倒塌性能.

The dynamic response of the remaining structures under sudden failure of a corner column in a reinforced concrete (RC) frame structure was studied. The finite element model of ABAQUS / Explicit was established based on the loss of a corner column tested by Qian K. The finite element model took into account the strain rate effect of reinforced concrete materials and simulated the actual loading process. The simulation results were in good agreement with the field-test dynamic response curves and failure modes, which simulated the whole process of sudden removal of a corner column. Based on the finite element model, the influence of corner column failure time and lateral restraint stiffness on the dynamic response of the structure was analyzed. The results show that prolonging the failure time and increasing the lateral horizontal restraint stiffness can effectively improve the collapse resistance of the structure.