Kaewunruen evaluated the reliability of prestressed concrete sleepers and using reliability analysis found that sleeper shape is optimized, such that sleepers tend to provide low to moderate safety indices at the service performance level and developed the reliability-based design for concrete sleepers that resulted optimize and save material ...Web

Prestressed concrete sleeper is a safety-critical track component widely used in ballasted railway tracks. The performance, endurance and quality of prestressed concrete sleepers can detrimentally ...Web

Crushing is a common damage (under resultant compressive stress) in concrete sleepers, which is attributable to excessive flexural, shear, pre-stress and …Web

prestressed concrete sleepers. Mono-block prestressed concrete sleepers, which were first employed in the early 40's, have become essential components in high speed rail track constructions worldwide [28, 29]. The extraordinary development of high speed train networks in Europe and Asia [30], has led to a great number of studies on the ...Web

prestressed concrete sleepers was also evaluated to determine the amount of energy required to fail the sleeper under impact load. Static and impact tests were carried ... where the compressive crushing of concrete and the concrete cracking in tension zone can be accommodated [6-7]. In the current practice, the smeared crack analogy is ...Web

Prestressed concrete sleepers in (a) normal position for positive capacity computation. (b) inverse position for negative capacity computation. ... After that, the curve drops rapidly due to the crushing and spalling of concrete. The effect of longitudinal hole in the prestressed concrete sleepers is evaluated by the moment capacity.Web

The inclusion of fibres in prestressed concrete sleepers has a negligible influence on the pre-cracking strain behaviours when tested under rail seat positive moment configuration. Indeed, the variation between PO and PF results at first crack was minor, …Web

Three-dimensional nonlinear finite element model of railway prestressed concrete sleeper has been developed in this study. The general purpose finite element package, ANSYS 10, is employed for the ...Web

Prestressed concrete is the most commonly used type of railway sleepers around world. Crushing is a common damage (under resultant compressive stress) in concrete sleepers, which is attributable to excessive flexural, shear, pre-stress and bond actions. ... New designed LCR-6 type sleepers were compared with standard B70 type …Web

sleeper bending scenario is highly variable depending on the track substructure condition (Sadeghi 2008); therefore, causing variability in the location of peak bending stresses along the sleeper in different rail tracks. Rail Prestressed concrete Sleeper Figure 1. Typical prestressed concrete sleeper in railway track. Figure 2. Typical wheel ...Web

Introduction. Prestressed concrete sleepers are one of the most important components in ballasted railway tracks [[1], [2], [3]]. Prestressed concrete sleepers lie between the rail and ballast, to transfer the train's loads from the wheel to the rail, and the rail to the ballast bed; and then to secure rail gauge and keep the geometry of railway …Web

Abstract. This work examines the crack initiation and propagation in Prestressed Concrete (PC) beams by a combined experimental and numerical approach. Four-point bending tests performed on PC sleepers lead to the formation of multiple cracks, in a number that depends on the specimen. The location of each fracture and its growth …Web

The proposed methodology aims to determine the following items: the suitable sleeper spacing for a given rail type, the wheel load distribution along successive sleepers, the moment within mono-block pre …Web

To automate complex design procedures, machine learning has been employed in the design of prestressed concrete sleepers. In this study, the maximum …Web

Railway prestressed concrete sleeper is an imperative for component of ballasted railway tracks. Its main function is to help distributing axle loading to sub grade and formation. By nature, the concrete sleeper is subjected to sagging moment at the rail seat zone and to hogging moment at the middle section. Although behaviours of concrete ...Web

The present paper proposes scientific and practical methodology to solve the following problems: the value of dynamic impact factor, sleeper spacing, Wheel load distribution along successive sleepers, stress beneath the sleeper and stress reductionWeb

Crushing is a common damage (under resultant compressive stress) in concrete sleepers, which is attributable to excessive flexural, shear, pre-stress and bond actions. Dynamic impact loading ...Web

A comparative analysis of the structural behaviour of prestressed concrete sleepers made with high performance concrete (HPC) and high performance recycled aggregate concrete (HPRAC) is presented ...Web

The prestressed concrete monoblock sleeper is usually installed on a ballasted track (Fig. 1), which is commonly divided into superstructure and substructure.The sleeper, rails, and fastening system make up the superstructure, while the ballast, sub-ballast, and subgrade represent the substructure [17].The main materials of prestressed …Web

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Title: Performance of Innovative Precast Concrete Sleepers Prestressed with Glass Fiber-Reinforced Polymer Reinforcing Bars. Author(s): Abdeldayem Hadhood, Hamdy M. Mohamed, ... while the prestressed steel-RC sleepers failed by crushing of the concrete due to the slippage of steel strands. Moreover, field inspection of GFRP …Web

DOI: 10.14359/51728184. Date: 3/1/2021. Abstract: The cohesive/overlapping crack model represents an effective tool in the study of failure transition phenomena occurring in plain or reinforced concrete structures. In the present paper, this non-linear fracture mechanics model is applied to study the global structural behavior of …Web

The proposed methodology aims to determine the following items: the suitable sleeper spacing for a given rail type, the wheel load distribution along successive sleepers, the moment within mono-block pre-stressed concrete sleeper (B70), the crushing strength between (sleeper and ballast surface) and finally the suitable effective ballast depth.Web

For prestressed GFRP sleepers to be accepted as replacements for defective sleepers made with timber and concrete, they must pass several short- and long-term tests. Full-scale GFRP- and steel-reinforced concrete sleepers were designed, tested, and compared according to the requirements of the American Railway Engineering and Maintenance-of …Web

This paper presents an investigation on pre-stressed concrete sleepers based on the principles of fracture mechanics in concrete material. To evaluate fracture mechanics parameters pre-stressed ...Web

Prestressed concrete sleepers manufactured in accordance with Australian Standard AS1085.14, or other design guidelines, are designed to reduce or eliminate low magnitude but high cycle fatigue problems. ... Prestressed concrete is the most commonly used type of railway sleepers around world. Crushing is a common damage (under …Web

The proposed methodology aims to determine the following items: the suitable sleeper spacing for a given rail type, the wheel load distribution along successive sleepers, the moment within mono-block pre-stressed concrete sleeper (B70), the crushing strength between (sleeper and ballast surface) and finally the suitable effective ballast depth.Web