Development of Railway Turnout Structural Condition Index
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RESEARCH PAPER
Development of Railway Turnout Structural Condition Index Asadollah Rahmani1 · Seyed Mohammad Seyedhosseini2 Received: 18 June 2019 / Accepted: 10 October 2020 © Shiraz University 2020
Abstract An efficient track maintenance management system depends on a reliable track conditions assessment. The available track condition indices have been developed based on the geometry assessment or visual inspection of the straight tracks and curves structural conditions. The literature review indicates that there is no research on the indices development for the track turnouts and switch conditions, despite their important role in the track performance and safety. It is the critical requirement to develop switch condition index. In response to this requirement, in this study an index for the track turnout and switches structures conditions was developed for the first time. The index was developed based on the results of the filed investigation as well as statistical analyses of engineering experiences and expert judgments using the Delphi method. The applicability and reliability of the new index were evaluated by analyzing the index obtained for 23 turnouts. It was shown that the new index provides a better understanding of the track safety level and cost-effective maintenance and it optimizes repair planning for the turnout and crossing. Keywords Turnouts · Condition index · Visual inspection · Switch Abbreviations TGI Track geometry index TQI Track quality index w5 Quality measure of line segments J Indicator of a track quality R2 Track roughness index QI Quality index TSI Track structural index DV Deduct value M Mean value SD Standard deviation SCI Condition indices for switch components FCI Condition indices for frog components GCI Condition indices for guardrail components g Total summed deduction values t Total summed deduction values * Seyed Mohammad Seyedhosseini [email protected] Asadollah Rahmani [email protected] 1
Department of Construction Management, Faculty of Engineering, The Islamic Azad University, South Branch, Tehran, Iran
Department of Industrial Engineering, Iran University of Science and Technology, Narmak, Tehran, Iran
2
T Type of turnout defect S Defect-severity level
1 Introduction Turnouts are inevitable parts of the railway track systems. They play an important role in the train’s average speed and running safety. According to the available reports, passenger comfort and track safety decrease exponentially as the conditions of these parts are deteriorated (Turel 2018; Sadeghi et al. 2017a, b; Sadeghi 2012; Sadeghi and Askarinejad 2009; ORE 1981). Due to the important roles of turnouts in track safety, these sections maintenance become more important. In other words, turnout defect detection tools and facilities are expensive and for this reason, it is crucial to pay attention to them (Ebadi et al. 2018). Also, the railway turnout construction is a complex geometry and special science, which makes it as one of the most critical railway infrastr
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