论文部分内容阅读
考虑材料非线性和应变率相关性等因素的影响,运用LS_DYNA非线性有限元软件对RC梁横向低速冲击试验进行了数值模拟,从动态损伤扩展、冲击能量转化等方面研究了RC梁的冲击响应过程和破坏机理。结果表明:RC梁的冲击响应过程可分为局部响应、整体响应和回弹变形三个阶段;RC梁的损伤主要发生在局部响应阶段,梁体变形主要发生在整体响应阶段;局部响应阶段的冲击力完全由梁体惯性力平衡,整体响应阶段的变形模式和截面弯矩分布与刚塑性模型基本相同;受拉钢筋变形耗能是RC梁最主要的冲击耗能机制。
Considering the influence of material nonlinearity and strain rate correlation, the LS_DYNA nonlinear finite element software is used to simulate the transverse low-velocity impact test of RC beams. The impact response of RC beams is studied from dynamic damage propagation and impact energy transformation Process and destruction mechanism. The results show that the impact response of RC beams can be divided into three phases: local response, global response and springback deformation. The damage of RC beams mainly occurs in the local response phase and the beam deformation occurs mainly in the whole response phase. In the local response phase The impact force is completely balanced by the inertial force of the beam body. The deformation mode and the distribution of bending moment in the whole response phase are basically the same as the rigid plastic model. The deformation energy loss of the tensioned steel bar is the most important impact energy dissipation mechanism of the RC beam.