Influence of Track Typology on the Dynamic Response of Short-Span High-Speed Railway Bridges

IF 0.1 Q4 ENGINEERING, CIVIL
Elena Pilar Martínez, G. Ulzurrun, C. Zanuy
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引用次数: 0

Abstract

It is known that short-span high-speed railway viaducts are prone to suffer significant dynamic effects due to the passage of moving train loads. Recent technological advances in railway engineering have resulted in track typologies different from the conventional ballasted track consisting of discrete sleepers fastened to the rails and resting on a ballast bed. In particular, ballastless track has been identified as an effective solution due to reduced maintenance costs, high track stability and excellent geometric quality. Though different track typologies are available in the market, they can be classified as monolithic or independent according to the interaction degree with the bridge girder. In the present paper, the dynamic behaviour of short-span bridges is numerically studied by taking into account the track-bridge interaction by modelling explicitly the components of the track. Two types of ballastless track (monolithic continuous slab and independent short slabs) and conventional ballasted track are considered on simply supported bridges with span length in the range of 15-25 m subjected to envelope and commercial train loads at speeds between 200 and 360 km/h. In total, 2448 numerical cases have been analyzed. The study shows that dynamic deflections and accelerations produced at the bridge girder by moving train loads can be reduced when the ballasted track is replaced to ballastless track systems, especially for the critical speeds higher than 300 km/h. Moreover, it is shown that the two ballastless track systems lead to very similar results, with the monolithic system resulting in slightly smaller bridge deflections and also moderately larger accelerations.
轨道类型对短跨度高速铁路桥梁动力响应的影响
众所周知,短跨度高速铁路高架桥由于列车荷载的通过而容易受到显著的动力影响。铁路工程的最新技术进步导致了不同于传统有砟轨道的轨道类型,该轨道由固定在轨道上并放置在道床上的离散轨枕组成。特别是,无砟轨道由于降低了维护成本、高轨道稳定性和优异的几何质量而被认为是一种有效的解决方案。尽管市场上有不同的轨道类型,但根据与桥梁的相互作用程度,它们可以分为整体式或独立式。在本文中,通过对轨道构件进行明确建模,考虑轨道与桥梁的相互作用,对短跨度桥梁的动力特性进行了数值研究。在跨度为15-25m的简支梁桥上,考虑了两种类型的无砟轨道(整体连续板和独立短板)和传统有砟轨道,承受200至360 km/h的包络线和商业列车荷载。总共分析了2448个数值案例。研究表明,当有砟轨道更换为无砟轨道系统时,特别是在临界速度高于300km/h的情况下,移动列车荷载在桥梁梁上产生的动态挠度和加速度可以降低。此外,研究表明,两种无砟轨道系统的结果非常相似,整体系统的桥梁挠度略小,加速度也略大。
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来源期刊
Hormigon y Acero
Hormigon y Acero ENGINEERING, CIVIL-
CiteScore
0.50
自引率
0.00%
发文量
4
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