落石冲击作用下环形网耗能性能数值分析

摘要

环形网作为被动柔性防护系统中主要的耗能构件，对其耗能性能的研究显得尤为重要。根据被动柔性防护系统中环形网受到的约束条件，对环形网的计算模型进行了简化处理。采用ANSYS/LS-DYNA软件对环形网进行了动力有限元分析，考察了落石尺寸、冲击速度等因素对环形网耗能性能的影响。分析结果表明：落石的下降距离、最大加速度均随落石直径的增大而减小；落石的直径越小，冲击速度越大，环形网越容易被破坏。动力有限元分析的结论可为环形网在防护工程中的应用提供参考。%Ring net is the main energy dissipation component of the flexible protecting system, therefore it is important to study its energy dissipation performance. This paper simplifies the calculation model of the ring net according to the constraints in passive protecting system. A finite element dynamic simulation is conducted based on the ANSYS/LS-DANY program to analyze the influence on the energy absorbing ability of the ring net which is impacted by the rockfalls of different diameters and velocities. The results show that drop distance and maximum acceleration decrease with the rockfall diameter increasing. When the rockfall diame-ter gets smaller and the impact velocity grons bigger, the ring net will be penetrated easily. The research results can be used as a ref-erence to the application of ring nets on protection engineering.