A three-dimensional finite element analysis of concrete sleepers and fastening systems subjected to coupling vertical and lateral loads

Influence of coupling vertical and lateral loads on the centre negative flexural behaviour of prestressed monoblock concrete sleepers

“…This methodology was adopted in other research studies. 5,8,18 As depicted in Figure 2, the specified FE model comprises seven PMCS of type B70. Figure 3 denotes the sleeper shape and its reinforcement details.…”

“…Such element size was proven elsewhere to accurately simulate the structural response of PMCS. 5,8,30 In addition, the concrete was meshed using linear brick elements (C3D8). As for the ballast layer, the adopted element size is 50 mm × 50 mm × 50 mm since the result of mesh sensitivity analysis indicated that the centre negative flexural stress of the concrete sleeper decreased by around 3% as the element size increased from 10 mm × 10 mm × 10 mm to 50 mm × 50 mm × 50 mm.…”

“…This loading pattern contributes to a significant deterioration of the railway track components, including prestressed monoblock concrete sleepers (PMCS). 4,5 In the previous investigations, [5][6][7][8] the influence of lateral loads on the formation of rail seat abrasion (the highest-ranked failure mechanism of PMCS in North America) 4 due to localized stresses at the concrete surface was thoroughly analysed. The results expressed in these studies, however, showed that the loading nature changes at the rail seat area under coinciding vertical and lateral loading compared to the vertical loading case in a form that could have a significant impact on the flexural stress of PMCS, particularly at midspan sections.…”

Development of a new and modification of existing elastic clips for rails fastening

“…After the calibration and validation of the clip's and/or fastening system's numerical model, parametric analyses can be performed. The most frequently considered parameters are the dimensions, shape [ [16,74,77,80] and material properties of the clip [68], the magnitude of the axle load and its position on the rail running surface [23,47], and the distance of concrete sleepers, that is, the distance of the rail supports [23], the change in the stiffness of the rail pad [48,49].…”

Stress Analysis of Vehicle Wheel Component of Rail System Vehicles for Plain and Curved Rail Cases in High-Speed Freight Transport

“…El-Sayed vd. [4] dikey ve yanal tekerlek yüklerine maruz kalan demiryolu traverslerinin ve bağlantı elemanlarının sonlu elemanlar yöntemini kullanarak üç boyutlu analizini yapmıştır. Yanal yüklerdeki artış ray oturma yüzeyinde ve ray bağlantı elemanlarında bozulmalara neden olmakta, bu da güvenlik ve bakım maliyetleri açısından olumsuzluklar ortaya çıkarmaktadır.…”