Dynamic behavior and safety assessment of vertical fall-arrest system with flexible tracks for transmission tower under falling impact load

IF 4.4 2区工程技术 Q1 ENGINEERING, MECHANICAL

Engineering Failure Analysis Pub Date : 2025-04-20 DOI:10.1016/j.engfailanal.2025.109608

Chongkai Fan , Dachang Zhang , Dabo Xie , Yi An , Fenghua Huang

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引用次数: 0

Abstract

This paper focuses on the dynamic behavior and safety assessment of vertical fall-arrest system with flexible tracks for transmission tower under falling impact load. Thirty drop tests were conducted using different test methods with different falling heights and hanging-board thicknesses. The dynamic behavior of the fall-arrest process was primarily researched, and the force–time curves of the flexible track and rope were obtained by tests. Furthermore, the strain of the hanging board and the rope grab during the fall were investigated, and energy dissipation and safety assessments were carried out. Finally, an energy balance calculation method based on the dynamic nonlinear stiffness of the rope was proposed to calculate the fall displacement and maximum impact load of the works. The results showed that the vertical fall-arrest system could extend the load-bearing time of workers through the deformation of the track and rope grab, thereby reducing the maximum impact force on them. However, vertical fall-arrest systems still pose safety risks, and the impact loads on workers often exceed the safety limits. The effect of the impact load on the material stiffness cannot be ignored, and it is unreliable to only conduct static analysis to predict the impact force and displacement of workers. The proposed energy balance calculation method based on the dynamic nonlinear stiffness has good accuracy. The research results can provide a reference for the dynamic behavior calculation and design of fall-arrest systems to further reduce the occurrence of falling accidents and for the construction and maintenance of transmission towers.

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输电塔柔性轨道垂直防坠系统在落冲击载荷作用下的动力性能及安全性评估

本文主要研究了输电塔柔性轨道垂直防坠系统在下落冲击载荷作用下的动力性能及安全性评价。采用不同的试验方法，在不同的落点高度和吊板厚度下进行了30次跌落试验。初步研究了防坠过程的动力学特性，通过试验得到了柔性履带和绳索的力-时间曲线。研究了吊板和抓绳在坠落过程中的应变，并进行了耗能和安全评价。最后，提出了一种基于绳索动态非线性刚度的能量平衡计算方法，用于计算工程的下落位移和最大冲击载荷。结果表明，垂直防坠系统可以通过轨道和抓绳的变形延长工人的承重时间，从而减小对工人的最大冲击力。然而，垂直防坠系统仍然存在安全风险，对工人的冲击载荷往往超过安全极限。冲击载荷对材料刚度的影响不容忽视，仅通过静力分析来预测工人的冲击力和位移是不可靠的。提出的基于动态非线性刚度的能量平衡计算方法具有较好的精度。研究结果可为防坠系统的动态行为计算和设计提供参考，进一步减少防坠事故的发生，并为输电塔的建设和维护提供参考。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Engineering Failure Analysis 工程技术-材料科学：表征与测试

CiteScore

7.70

自引率

20.00%

发文量

956

审稿时长

47 days

期刊介绍： Engineering Failure Analysis publishes research papers describing the analysis of engineering failures and related studies. Papers relating to the structure, properties and behaviour of engineering materials are encouraged, particularly those which also involve the detailed application of materials parameters to problems in engineering structures, components and design. In addition to the area of materials engineering, the interacting fields of mechanical, manufacturing, aeronautical, civil, chemical, corrosion and design engineering are considered relevant. Activity should be directed at analysing engineering failures and carrying out research to help reduce the incidences of failures and to extend the operating horizons of engineering materials. Emphasis is placed on the mechanical properties of materials and their behaviour when influenced by structure, process and environment. Metallic, polymeric, ceramic and natural materials are all included and the application of these materials to real engineering situations should be emphasised. The use of a case-study based approach is also encouraged. Engineering Failure Analysis provides essential reference material and critical feedback into the design process thereby contributing to the prevention of engineering failures in the future. All submissions will be subject to peer review from leading experts in the field.