减压环在被动柔性防护网中的耗能作用研究

摘要

Based on the complexity of the falling rock protection barriers and the efficiency to study different system parameters, the numerical method is becoming an important method to explore the dynamic mechanical response of the passive flexible protection system. To study the energy dissipation and buffer action of the ring-brake energy dissipater in the passive flexible protection against rockfall, an actual passive flexible protection prototype is employed to establish two finite element models for flexible protection system with and without ring-brake energy dissipater. Based on ANSYS/LS-DYNA, the dynamic response of the two finite element models with different impact energy and impact position is analyzed. The results show that the ring-brake energy dissipater can enhance the flexibility of the passive flexible protection and improve the performance of the site of action, while the energy dissipation capacity of the passive flexible protection is also significantly improved. Meanwhile, the comparative analysis of the numerical results provides references for the coming experiment design to calibrate the numerical model and identify the governing characteristics of the components.%基于落石防护措施受力系统的复杂性及不同系统参数研究的有效性角度考虑，数值方法正成为研究被动柔性防护网动态受力行为的重要手段。为研究被动柔性防护网中的减压环在落石冲击作用下的耗能及缓冲作用，以实际被动柔性防护网为原型，建立含减压环及不含减压环的两种被动柔性防护网有限元模型，基于 ANSYS/LS-DYNA分析两种防护网在不同冲击能量及冲击位置下的动力响应。研究结果表明：减压环可增强被动柔性防护网的柔性、改善作用部位的性能，同时能显著地提高被动柔性防护网的耗能能力。同时，数值结果的对比分析为下一步试验设计以校正有限元模型和研究实体构件受力特征提供了参考依据。