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
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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
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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
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The DIC results show that the rubber prestressed concrete sleeper (RPCS) has a resistance against crack initiation that is 20% greater than that of the conventional prestressed concrete sleeper ...Web
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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
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and prestressed concrete members. A three-dimen-sional non-linear finite element model of a railway prestressed concrete sleeper was developed using the general purpose finite element analysis package, ANSYS10 [7]. The concrete section was modelled using SOLID65 solid element where the compres-sive crushing of concrete and the concrete …Web
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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
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1. Introduction. Railway sleepers carry and distribute rail loads to the rail-supporting substructure, preserve track gauge and endure vertical and longitudinal rail movement (Taherinezhad et al., 2013).Due to enhanced durability and structural performance as well as a lower lifetime cost compared to other types of railway beds, …Web
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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
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The 28-day crushing strength of the concrete is not less than 525kg.The rail is placed on a grooved 130×130mm rubber pad. The fastening system is P-clip for 52kg rail, which are held in the cast iron inserts. A. PCS-12 and PCS-14 concrete sleepers . PCS-12 concrete sleeper is the type of pre-stressed concrete sleeper for use on BG lines with ...Web
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The objectives of present study is to ascertain the behaviour of ternary blended prestressed concrete sleepers under static bending test and to make …Web
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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
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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
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PDF | Prestressed concrete sleepers (PCSs) are the most commonly used type of sleepers. They play an essential role in track …Web
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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
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Four full-scale pre-stressed railway concrete sleepers kindly supplied by industry partner CEMEX are shown in Fig. 1(a). The characteristic length of sleepers is 2500 mm, depth at mid-span is 175 mm, depth at rail seat is 200 mm and width is 200 mm in accordance with CEMEX [40]. ... The marking of crack progression (shown in Fig. 4) was …Web
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The modified compression field theory for ultimate strength behaviours of concrete sleepers will be highlighted in this study. The outcome of this study will enable the new design and calculation methods for prestressed concrete sleepers with holes and web opening that practically benefits civil, track and structural engineers in railway industry.Web
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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
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sive crushing of concrete and the concrete cracking in tension zone can be accommodated [8-10]. In the ... Figure 4: LS-Dyna impact model of railway pre-stressed concrete sleeperWeb
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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
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Abstract A comparative analysis of the structural behaviour of prestressed concrete sleepers made with high performance concrete (HPC) and high performance …Web
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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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Prestressed concrete sleepers [PCS] are widely used in ballasted railway tracks across the world. Sleepers distribute the load coming from the rails to the ballast. …Web
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The primary causes of failure of prestressed concrete sleepers have been identified from the review of the literature and are explained below. 3.1 Rail Seat Deterioration. ... found that adding up of damages caused by crushing in the face of high repetitive loads initiate rail seat deterioration [3]. Fig.1 shows a schematic diagram for the …Web
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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
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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
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Prestressed concrete is the most commonly used type of railway sleepers around world. Crushing is a common damage (under resultant compressive stress) in …Web
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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
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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
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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
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Highlights Prestressed concrete sleepers are being increasingly used for modern railways worldwide. The main advantages of this type of sleeper are its high …Web
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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 in this study. Two types of HPRAC sleepers were tested, using 50 and of recycled concrete aggregate (RCA) in replacement …Web
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Prestressed concrete sleepers are essential to the structural integrity of railway track structures, redistributing wheel loads from the rails to underlying ballast bed while securing rail gauges for safe train traffics. ... The two main failure mechanisms in CDP models are tensile cracking and compressive crushing of concrete. In this study ...Web
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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
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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
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Railway prestressed concrete sleepers are located between the rail and ballast in transverse direction to the rail. The sleepers transfer the loads from the rail to the track …Web
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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
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The existing variation is mainly due to the difference in the geometry of the concrete sleeper used in the computations. Besides, the same modelling strategy was proven elsewhere to replicate the experimental bending test results of prestressed concrete sleepers [35]. This means that the modelled concrete sleeper can …Web
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