基于有限单元法的钢筋混凝土防洪堤动力分析

Dynamic analysis of reinforced concrete flood embankment based on finite element method

为了合理设计防洪堤钢筋混凝土结构,使其能够更加有效抵御可能遭受的各种冲击,通过有限元分析软件Abaqus对防洪堤内部钢筋混凝土进行模拟立体结构建立,形成了防洪堤钢筋混凝土梁柱节点模型。其次,通过数值模拟和控制变量的方法进行钢筋混凝土梁柱节点受冲击实验。最后,研究钢筋混凝土防洪堤在冲击力作用下的动力影响效果。实验结果表明:冲击荷载对节点中心位移的影响相对较小,当冲击速度由5 m/s增大至10 m/s时,系统内能明显有所增加,整体上系统内能与冲击块的质量呈正相关增加趋势,并且冲击质量对系统内能影响较大,而且对冲击后期的位移影响较大。所以,钢筋混凝土防洪堤系统受冲击速度影响大于受冲击质量影响大于受预加荷载的影响大于受配筋率的影响。能够更加有效地保障人民群众的生命财产安全,对防洪堤建设工程具有重要意义。

In order to design the reinforced concrete structure of the flood dike so that it can effectively resist various possible impacts, the three-dimensional structure of the reinforced concrete inside the flood dike was simulated by the finite element analysis software abaqus, and the reinforced concrete beam column joint model of the flood dike was formed. Secondly, the impact experiment of reinforced concrete beam column joints was carried out by numerical simulation and variable control method. Finally, the dynamic effect of reinforced concrete flood embankment under impact force was studied. The experimental results show that the impact load had a small impact on the central displacement of the node. When the impact speed had been increased from 5 m/s to 10 m/s, the energy in the system had been increased significantly. On the whole, the internal energy of the system was positively correlated with the mass of the impact block, and the impact mass had a greater impact on the internal energy of the system, and had a greater impact on the displacement at the later stage of the impact. So, the experimental results show that the reinforced concrete flood embankment system is affected by impact velocity>impact quality>preload>reinforcement ratio.It can more effectively ensure the safety of people′s lives and property, which is of great significance to the flood embankment construction project.