基于变形能量参数的多次重复撞击下柔性壁障累积损伤模型

IF 5.1 2区 工程技术 Q1 ENGINEERING, MECHANICAL International Journal of Impact Engineering Pub Date : 2024-08-21 DOI:10.1016/j.ijimpeng.2024.105093
Lijun Zhang , Zhixiang Yu
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引用次数: 0

摘要

现有的柔性落石护栏系统在使用过程中经常受到反复的落石冲击,但针对这些系统所遭受的累积损害的研究仍然有限。本文提出了一种新的数值模拟方法来研究反复冲击对柔性护栏系统的影响,该方法通过完全重启法考虑了部件的损伤和变形累积。为了验证这种数值模拟方法的有效性,进行了两次全尺寸连续冲击试验。两次试验的冲击条件均为服务能级(SEL)。研究了柔性屏障系统在反复冲击下的变形行为和能量耗散机制。研究结果表明,在落石冲击过程中,网是发生变形的主要部件,线环网的残余变形分别占系统整体残余变形的 61% 和 58%。此外,消能装置是负责消能的主要部件,在两次试验中分别占系统消能的约 71% 和 64%。考虑到防护网和消能装置都是影响屏障系统抵御落石冲击能力的关键部件,它们也容易遭受最严重的损坏。已设计出计算这些组件损坏程度的方法。线环网的残余挠度和消能装置耗散的能量被用作评估损坏情况的参数。利用挠度和能量耗散的双参数模型,开发了一种估算结构损坏的方法。进行了参数分析,以评估柔性护栏系统在 100 kJ 至 2000 kJ 的重复冲击能量下的性能。对屏障及其部件的累积损伤进行了深入研究。提出了一个简化的标准,用于评估屏障在多次重复撞击时产生的累积结构损伤。研究结果表明,撞击次数与部件和结构损坏之间存在线性关系,这种关系的斜率与撞击能量呈正相关。结构损坏的特点是网和消能装置的损坏,而后者是主要的影响因素。本文的研究结果为工程维护决策提供了宝贵的启示。
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A cumulative damage model based on deformation-energy parameters for flexible barriers under multiple repeated impacts

Existing flexible rockfall barrier systems are frequently exposed to repeated rockfall impacts during use, yet research addressing the cumulative damage sustained by these systems remains limited. A novel numerical simulation method is proposed to study the effects of repeated impacts on flexible barrier systems, which considers the damage and deformation accumulation of components through a complete restart method. Two full-scale sequential impact tests were conducted to validate this numerical simulation method's effectiveness. The impact conditions for both tests were service energy level (SEL). The deformation behavior and energy dissipation mechanism of the flexible barrier system subjected to repeated impacts were examined. The findings indicate that the net serves as the primary component undergoing deformation during rockfall impacts, with the residual deflection of the wire-ring net accounting for approximately 61 % and 58 % of the system's overall residual deflection in the respective tests. Furthermore, the energy dissipators emerge as the principal components responsible for energy dissipation, constituting approximately 71 % and 64 % of the system's energy dissipation in the two tests, respectively. Considering that both the net and the energy dissipator are key components influencing the barrier system's ability to withstand rockfall impacts, they are also prone to experiencing the most severe damage. Methods for calculating the damage of the components have been devised. The residual deflection of the wire-ring net and the energy dissipated by the energy dissipators are employed as parameters for assessing damage. A method for estimating structural damage is developed using a two-parameter model for deflection and energy dissipation. A parametric analysis was conducted to evaluate the performance of the flexible barrier system under repeated impacts spanning impact energies from 100 kJ to 2000 kJ. The cumulative damage in both the barrier and its components is thoroughly investigated. A simplified criteria for assessing cumulative structural damage incurred as the barrier undergoes multiple repeated impacts is proposed. The study findings indicate a linear relationship between the number of impacts and both component and structural damage, with the slope of this relationship positively correlating with impact energy. Structural damage can be characterized by damage of the net and the energy dissipators, with the latter as the primary influencing factor. The findings presented in this paper offer valuable insights for informing engineering maintenance decisions.

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来源期刊
International Journal of Impact Engineering
International Journal of Impact Engineering 工程技术-工程:机械
CiteScore
8.70
自引率
13.70%
发文量
241
审稿时长
52 days
期刊介绍: The International Journal of Impact Engineering, established in 1983 publishes original research findings related to the response of structures, components and materials subjected to impact, blast and high-rate loading. Areas relevant to the journal encompass the following general topics and those associated with them: -Behaviour and failure of structures and materials under impact and blast loading -Systems for protection and absorption of impact and blast loading -Terminal ballistics -Dynamic behaviour and failure of materials including plasticity and fracture -Stress waves -Structural crashworthiness -High-rate mechanical and forming processes -Impact, blast and high-rate loading/measurement techniques and their applications
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