Assessment of critical parameters affecting fretting fatigue life of bridge stay cables at saddle supports

IF 2.1 4区 工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY
Ali Chehrazi, Scott Walbridge
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Abstract

Saddle systems are a popular solution for supporting cables in cable-stayed bridges. Fretting fatigue failure of cables at saddle supports is a primary design consideration for these systems. Critical parameters that affect the fretting fatigue life of the cables are the contact forces and the slip displacements at the contact points between the cables and the saddle. Determining these critical parameters is the first step in evaluating the fretting fatigue life of the cables. Wear in the contact points between the cables and the saddle can affect the load distribution in saddle systems and consequently affect these critical parameters. However, the effect of wear has not been studied in the previous works. This paper first discusses the methods proposed in the literature for evaluating contact forces and slip displacements in the contact points between a cable and a saddle. Then, a finite element model of the problem and a framework for modelling the wear are presented. Finally, fretting fatigue life is determined based on the different studied approaches. The main highlights of the current study are considering the effect of wear in the simulation and employing an enhanced FE model for slip displacement calculations. The results of the basic model without wear effects showed that the first contact point between the cable and the saddle is critical for fatigue failure. However, by incorporating wear in the model, the contact force at the first point dropped and the second contact point became critical; this is in line with the observations in large-scale fatigue tests of saddle systems.
评估影响鞍式支座桥梁留置索摩擦疲劳寿命的关键参数
鞍座系统是斜拉桥中支撑电缆的常用解决方案。鞍座支撑处电缆的摩擦疲劳失效是这些系统的主要设计考虑因素。影响缆索摩擦疲劳寿命的关键参数是缆索与鞍座接触点的接触力和滑移位移。确定这些关键参数是评估电缆摩擦疲劳寿命的第一步。电缆和鞍座之间接触点的磨损会影响鞍座系统的负载分布,进而影响这些关键参数。然而,之前的研究并未对磨损的影响进行研究。本文首先讨论了文献中提出的评估电缆和鞍座接触点接触力和滑移位移的方法。然后,介绍了问题的有限元模型和模拟磨损的框架。最后,根据不同的研究方法确定了摩擦疲劳寿命。本次研究的主要亮点是在模拟中考虑了磨损的影响,并采用增强型有限元模型进行滑移位移计算。不考虑磨损影响的基本模型的结果表明,电缆与鞍座之间的第一个接触点是疲劳失效的关键。然而,将磨损纳入模型后,第一个接触点的接触力下降,第二个接触点成为临界点;这与鞍座系统大规模疲劳试验的观察结果一致。
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
Advances in Structural Engineering
Advances in Structural Engineering 工程技术-工程:土木
CiteScore
5.00
自引率
11.50%
发文量
230
审稿时长
2.3 months
期刊介绍: Advances in Structural Engineering was established in 1997 and has become one of the major peer-reviewed journals in the field of structural engineering. To better fulfil the mission of the journal, we have recently decided to launch two new features for the journal: (a) invited review papers providing an in-depth exposition of a topic of significant current interest; (b) short papers reporting truly new technologies in structural engineering.
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