Identification of appropriate risk analysis techniques for railway turnout systems

Dindar, Serdar; Kaewunruen, Sakdirat; An, Min

doi:10.1080/13669877.2016.1264452

Cited by 35 publications

(16 citation statements)

References 45 publications

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“…Risk categorisation and prioritisation are achieved for geometry restoration of railway turnout systems in various opera-tional environments (Ishak et al, 2016). Dindar et al showed how a turnout can be aff ected by the diversity of risks arising from natural hazards and global warming (Dindar et al, 2016b). This study has been the first investigation to reveal a significant relationship between de-railment and weather/climate conditions.…”

Section: Introductionmentioning

confidence: 66%

“…collision, de-railment (Dindar and Kaewunruen, 2018). It is found that derailment accounts for 9% of all accidents types, and the majority of those de-railments occur on turnouts (Dindar et al, 2016a). A derailment is likely to take place on railway turnouts when a rolling stock, such as a train, experiences unauthorised movements, causing it to run off turn-outs for a variety known reasons.…”

Section: Introductionmentioning

confidence: 99%

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Bayesian Network-based probability analysis of train derailments caused by various extreme weather patterns on railway turnouts

Dindar

Kaewunruen

et al. 2018

Safety Science

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Section: Introductionmentioning

confidence: 66%

Section: Introductionmentioning

confidence: 99%

Bayesian Network-based probability analysis of train derailments caused by various extreme weather patterns on railway turnouts

Dindar

Kaewunruen

et al. 2018

Safety Science

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“…The cost occupies 24% of maintenance and 23% of renewal budgets in the UK [2]. Furthermore, approximately 12,000 turnout related derailments have been reported in the EU, the annual cost of which is an estimated 200 million Euros [3]. Consequently, they are considered to be a top concern for smooth traffic management by infrastructure managers in Europe [4].…”

Section: Introductionmentioning

confidence: 99%

New Insights from Multibody Dynamic Analyses of a Turnout System under Impact Loads

et al. 2019

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A railway turnout is an essential infrastructure for managing railway traffic flexibility. In contrast, it imposes restrictions on train operations such as lower operational speeds through the turnout due to the complex movements of trains over the turnout. This results in the large-amplitude dynamic responses of the train-turnout interaction. Previous studies have focused on the train-turnout interactions entailing the wheel-rail contact forces and stresses. Very few of the studies considered the effects of the contact forces on the turnout structure and its components such as sleepers and bearers. Those previous studies neglected the dynamic forces and estimated the behavior of train-turnout interactions based on quasi-static calculations. In reality, turnouts are subjected to high impact forces, which can be higher than the permissible track forces. Consequently, a numerical model capable of determining impact forces was developed here, to evaluate the dynamic behaviors of a railway turnout and their effects on such turnout components as bearers, ballast, and so on. The model consists of a structured beam grillage laying on an elastic foundation with rigid wheelsets and a bogie. The model was verified by field measurements. The new insight stemmed from this study shows that neglecting the contribution of dynamic forces can result in the unsafe underestimation of train turnout behaviors.

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“…This procedure consists of the tensioning of steel rods before or after the concrete is moulded. Prestressed concrete presents increased ductility, higher flexural strength and resistance to cracking [18]. The stability and slight position movement offered by prestressed concrete sleepers because of its heavy weight meant that it had a significant acceptance in high-speed lines.…”

Section: Concretementioning

confidence: 99%

“…A major advantage of timber sleepers is their flexibility, which results in a great ability to resist vibrations deriving from dynamic loads in railway track system [18,19]. The ease of handling, replacement, and adaptation to track systems are other benefits of this material.…”

Section: Timbermentioning

confidence: 99%

Composites for Timber-Replacement Bearers in Railway Switches and Crossings

2017

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Recent developments in composite materials have resulted in their pilot adoption in railway industry, such as 'fibre-reinforced foamed urethane (FFU)', 'geopolymer concrete', 'recycled polymer', and 'CarbonLoc composite'. Railway track support systems are critical for safe and reliable operations of railway tracks. There are two types of support structures, which can be designed to be either a slab or a cluster of discrete bearers or sleepers. The choice of turnout support system depends on asset management strategy of the rail operators or maintainers. The aim of this paper is to present the criteria, fundamental and multi-disciplinary issues for the design and practical selection of composite materials in railway turnout systems. As a case study, a full-scale trial to investigate in-situ behaviours of a turnout grillage system using an alternative material, 'fibre-reinforced foamed urethane (FFU)' bearers, is presented. Influences of the composite bearers on track geometry (recorded by track inspection vehicle 'AK Car' and based on survey data), track settlement, track dynamics, and acoustic characteristics are highlighted in this paper. Comparative studies of composite materials for railway track applications are reviewed and presented in order to improve material design process. This state-of-the-art review paper will also focus on practicality and environmental risks of composite components in railway built environments. It embraces the requirement considerations of new materials for use as safety-critical track elements.

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Identification of appropriate risk analysis techniques for railway turnout systems

Cited by 35 publications

References 45 publications

Bayesian Network-based probability analysis of train derailments caused by various extreme weather patterns on railway turnouts

Bayesian Network-based probability analysis of train derailments caused by various extreme weather patterns on railway turnouts

New Insights from Multibody Dynamic Analyses of a Turnout System under Impact Loads

Composites for Timber-Replacement Bearers in Railway Switches and Crossings

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