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A Review of Behaviour of Prestressed Concrete Sleepers

机译:预应力混凝土轨枕性能综述

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Prestressed concrete sleepers (PCSs) are the most commonly used type of sleepers. They play a n essential role in track performance, behaviour and safety. The focus of the published literature on PCSs has p rimarily been on quantification of dynamic load and resulting structural behaviour of sleepers, interaction with other components of track and failure mechanisms. While structural performance of PCSs is very im- p ortant and researched as reflected by the large volume of published literature, concrete sleepers also need to m eet the durability requirements. It is known that only a small percentage of concrete sleepers remain in ser- v ice when reaching their intended design life, resulting in heavy maintenance and replacement costs. This pa- per reports a summary of the review of literature conducted as part of a broader investigation undertaken at the University of Melbourne. The aim of the investigation is to establish the material requirements of the con- crete sleepers in order to meet the structural and durability requirements. A summary of the latest works on dynamic responses (including natural frequencies and mode shapes, damping, bending moments and strain rates), failure modes, fatigue and durability aspects of PCSs are presented. Moreover, design approach and dynamic loads are discussed briefly. It is established that a comprehensive research with a focus on material characterisation for concrete sleepers is currently lacking.
机译:预应力混凝土轨枕(PCS)是最常用的轨枕类型。它们在跟踪性能,行为和安全性方面起着至关重要的作用。有关PCS的已发表文献的重点主要集中在动态载荷的量化以及由此产生的轨枕的结构行为,与轨道的其他组件的相互作用以及失效机制上。虽然PCS的结构性能非常重要,并且已通过大量已发表的文献进行了研究,但混凝土轨枕也需要满足耐久性要求。众所周知,当达到预期的设计寿命时,只有少量的混凝土轨枕会保留在服务中,从而导致大量的维护和更换成本。本白皮书报告了在墨尔本大学进行的广泛研究的一部分文献综述。研究的目的是确定混凝土轨枕的材料要求,以满足结构和耐用性要求。概述了PCS的动态响应(包括固有频率和振型,阻尼,弯曲力矩和应变率),破坏模式,疲劳和耐久性方面的最新工作。此外,简要讨论了设计方法和动态载荷。已经确定,目前缺乏针对混凝土轨枕的材料表征的全面研究。

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