Experimental, numerical and analytical modelling of a newly developed rockfall protective cable-net structure
Experimental, numerical and analytical modelling of a newly developed rockfall protective cable-net structure
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DOI：
10.5194/nhess-11-3197-2011
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发表时间：
2011-01-01
影响因子：
4.6
通讯作者：
Kinoshita, N.
中科院分区：
文献类型：
--
作者：
Dhakal, S.;Bhandary, N. P.;Kinoshita, N.
日本开发了一种新型的袋式落石防护索网结构--大跨度袋式落石防护索网。所提出的系统的全球性能进行了初步检查的实验（全尺寸）建模。考虑到物理实验的各种限制，特别是为了详细了解新开发的系统而进行的参数研究，认为有必要采用可靠和简化的数值建模方法。同样，考虑到数值模拟方法的复杂性，一种简化的建模方法可能更有效。在此背景下，本文提出了一个三层建模的LPR的设计。物理建模后，这表明，位移响应可能会采取更重要的LPR性能，有限元为基础的数值模拟。采用LS-DYNA程序对模型进行了单元级和结构级的实验标定和验证。最后，一个简单的分析模型组成的等效线性和弹性，集中质量，单自由度系统，能够预测的整体位移响应，提出了基于线动量和能量守恒的基本原理。该模型是反计算和修改的分析验证的数值模型。
An innovative configuration of pocket-type rockfall protective cable-net structure, known as Long-span Pocket-type Rock-net (LPR), has been developed in Japan. The global performance of the proposed system was initially checked by the experimental (full-scale) modelling. Given the various limitations of the physical experiments, particularly for the parametric study to have a detailed understanding of the newly developed system, a reliable and simplified method of numerical modelling is felt necessary. Again, given the sophistication involved with the method of numerical simulation, a yet simplified modelling approach may prove more effective. On top of this background, this paper presents a three-tier modelling of a design of LPR. After physical modelling, which has revealed that the displacement response may be taken more vital for LPR performance, Finite Element based numerical modelling is presented. The programme LS-DYNA is used and the models are calibrated and verified with the element-and structure-level experiments. Finally, a simple analytical modelling consisting of the equivalently linear and elastic, lumped-mass, single-degree-of-freedom system, capable of predicting the global displacement response, is proposed based on the basic principles of conservation of linear momentum and energy. The model is back-calculated and modified from the analyses of the verified numerical model.