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Experiments and Dynamic Finite Element Analysis of a Wire-Rope Rockfall Protective Fence

机译:钢丝绳防落护栏的试验及动态有限元分析

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摘要

The imperative need to protect structures in mountainous areas against rockfall has led to the development of various protection methods. This study introduces a new type of rockfall protection fence made of posts, wire ropes, wire netting and energy absorbers. The performance of this rock fence was verified in both experiments and dynamic finite element analysis. In collision tests, a reinforced-concrete block rolled down a natural slope and struck the rock fence at the end of the slope. A specialized system of measuring instruments was employed to accurately measure the acceleration of the block without cable connection. In particular, the performance of two energy absorbers, which contribute also to preventing wire ropes from breaking, was investigated to determine the best energy absorber. In numerical simulation, a commercial finite element code having explicit dynamic capabilities was employed to create models of the two full-scale tests. To facilitate simulation, certain simplifying assumptions for mechanical data of each individual component of the rock fence and geometrical data of the model were adopted. Good agreement between numerical simulation and experimental data validated the numerical simulation. Furthermore, the results of numerical simulation helped highlight limitations of the testing method. The results of numerical simulation thus provide a deeper understanding of the structural behavior of individual components of the rock fence during rockfall impact. More importantly, numerical simulations can be used not only as supplements to or substitutes for full-scale tests but also in parametric study and design. © 2012 Springer-Verlag Wien.
机译:当务之急是保护山区的建筑物免于落石,导致了各种保护方法的发展。这项研究介绍了一种由立柱,钢丝绳,金属丝网和能量吸收器制成的新型防落石围栏。实验和动态有限元分析均验证了该围岩的性能。在碰撞测试中,一块钢筋混凝土砌块顺着自然斜坡滑下,并撞到了斜坡末端的岩石围栏。使用专门的测量仪器系统来精确测量无需电缆连接的模块的加速度。特别是,研究了两个能量吸收器的性能,它们也有助于防止钢丝绳断裂,从而确定了最佳的能量吸收器。在数值模拟中,采用具有显式动态功能的商业有限元代码来创建两个全面测试的模型。为了便于模拟,对围岩各个部分的机械数据和模型的几何数据采用了某些简化的假设。数值模拟与实验数据之间的良好一致性验证了数值模拟。此外,数值模拟的结果有助于突出测试方法的局限性。因此,数值模拟的结果使人们更深入地了解了落石冲击过程中围岩各个部件的结构行为。更重要的是,数值模拟不仅可以用作全面测试的补充或替代,还可以用于参数研究和设计。 ©2012 Springer-Verlag维也纳。

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