Dynamic Effect on Vibration Signatures of Cracks in Railway Prestressed Concrete Sleepers

Kaewunruen, Sakdirat; Remennikov, Alexander

doi:10.4028/www.scientific.net/amr.41-42.233

Cited by 18 publications

(15 citation statements)

References 15 publications

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“…The results showed that the rail pad parameters have the nonlinear effects on the effective stiffness significantly influencing the first three modes of the in situ track system, and can remarkably affect the frequencies and mode shapes of the further modes. Kaewunruen and his colleague have also theoretically investigated the dynamic effect on vibration signatures of cracks in concrete sleepers (Kaewunruen and Remennikov 2008a). They concluded that cracks in concrete sleepers weaken their flexural stiffness, resulting in the decrease in resonance frequencies.…”

Section: Review Of the Literaturementioning

confidence: 97%

“…They concluded that cracks in concrete sleepers weaken their flexural stiffness, resulting in the decrease in resonance frequencies. They also showed that the damping coefficient tends to increase with crack incurrence (Kaewunruen and Remennikov 2008a). Besides works made at UW, several attempts have been made worldwide but less directly related to the experimental evaluation of dynamics of concrete sleepers.…”

Section: Review Of the Literaturementioning

confidence: 98%

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Field Investigation on Dynamics of Railway Track Pre-Stressed Concrete Sleepers

Sadeghi

2010

Advances in Structural Engineering

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A comprehensive field investigation was made with the aim of achieving a better understanding of the dynamics of railway track pre-stressed concrete sleepers. Modal analysis and free decay method were used to determine the natural frequencies, model shapes and damping of sleepers. The validity of the results is discussed by comparing the results obtained here with those available in the literature. In order to investigate the characteristics of the dynamics of the loads imposed on the sleepers, load cells were installed between the rail seat and the sleeper and beneath the sleeper, recording the interaction between both sleeper and rail, and sleeper and ballast. The loads transferred from the rail to the sleeper and from the sleeper to the ballast were measured as a function of train speed. The rail seat load and the contact pressure between the ballast and the sleepers versus train axle loads and train speeds were recorded. The effects of the sleeper supporting conditions on the sleeper dynamic behaviour were investigated. The ratios of the rail seat load and the ballast contact pressure to the wheel load were obtained from the analyses of the field test results. These ratios were used to calculate the dynamic impact factors and ballast-sleeper pressure distribution patterns required for the design of sleepers. The methods, the test procedures and the results are presented and discussed in this paper.

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Section: Review Of the Literaturementioning

confidence: 97%

Section: Review Of the Literaturementioning

confidence: 98%

Field Investigation on Dynamics of Railway Track Pre-Stressed Concrete Sleepers

Sadeghi

2010

Advances in Structural Engineering

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“…The causes of the dynamic augments vary from irregularities in the geometry of the track structure, the surface of the rail or the wheel; to the vehicle operating speed; and the mass of the vehicle suspension characteristics (Esveld, 2001). Impact loads are infrequent but have high magnitude and short duration, and their typical magnitudes in the reviewed cases of freight traffic vary roughly between 100 kN and up to 750 kN, depending on the causes and the travelling speed of the train (Reminnikov & Kaewunruen, 2008). In case of high-speed lines, loading is even higher.…”

Section: Introductionmentioning

confidence: 97%

“…The substructure includes ballast, sub-ballast, subgrade and formation, while the superstructure includes sleepers, rail pads, fasteners and rails (Kaewunruen & Reminnikov, 2008). Sleepers are the track components of the ballasted track which rest on the ballast formation transversely, provide support and fixation to the rails and transmit the stresses to the lower layers.…”

Section: Introductionmentioning

confidence: 99%

Finite element modelling of cracked railway pre-stressed concrete sleepers

Montalbán

Zamorano²,

Palenzuela

et al. 2014

European Journal of Environmental and Civil Engineering

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Loading conditions on railway tracks are the result of the sum of the static axle load of vehicles and augments caused by dynamic effects. Dynamic loads have several causes and can be quasi-static or impacts. Cracking in pre-stressed concrete sleepers is mainly due to these impact loads and vibrations, converting the central and the rail seat sections of the critical sections in sleepers. This paper presents the development of a finite element model of a cracked sleeper that may be adapted to every condition of damage related to cracking. Cracks have been modelled as volumes characterised by a lower stiffness in order to simulate the loss of inertia. The models have been updated in terms of the frequencies of the first three bending modes of vibration of cracked and uncracked sleepers, obtained using experimental modal analysis technique, as presented in previous author's work. The updating process led to the mechanical properties that define the whole model. Results point out that frequencies obtained with the numerical model agree experimental data obtained in laboratory. These models may be used in further investigations to predict the static influence of cracked sleepers in complete finite element models of ballasted railway tracks.

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“…The typical full-scale prestressed concrete sleepers as shown in Figure 2, which are often used in broad gauge tracks, were selected for these tests. The dimensions and shape of the prestressed concrete sleepers used in the impact tests can be found in the companion paper [6]. The average compressive strength of cored concrete is 88.5MPa in accordance with AS1012.14 [7].…”

Section: Experimental Overviewmentioning

confidence: 99%

Probabilistic Impact Fractures of Railway Prestressed Concrete Sleepers

Kaewunruen¹,

Remennikov

2008

AMR

Self Cite

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Abstract. Cracks in railway prestressed concrete sleepers are often caused by the infrequent but high magnitude impact forces. These impact forces are attributed to the wheel or rail abnormalities, e.g. wheel flat, corrugation, dipped joint, etc. The emphasis of this paper is placed on the corresponding fractures of railway prestressed concrete sleepers in track systems under the probabilistic impact loadings. The statistical data of impact loadings in Central Queensland have been obtained through the collaborative project under the research framework of the Australian Cooperative Research Centre for Railway Engineering and Technologies. It is found that for the heavy haul railway network, the track structures, especially the concrete sleepers, may experience the impact loading from 400kN up to 800kN. The corresponding probabilities of such load occurrences are ranging from one in twenty years to one in thousands of years. It is very important for the design and maintenance perspectives to investigate the impact behaviour of concrete sleepers under the impact loadings. This paper presents the impact fractures of railway prestressed concrete sleepers under the single impact loading associated with the probability of occurrence in the soft track environment. Visual interfacial cracks have been evaluated for the crack length and width along the sleepers in relation to the probability of load occurrence.

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Dynamic Effect on Vibration Signatures of Cracks in Railway Prestressed Concrete Sleepers

Cited by 18 publications

References 15 publications

Field Investigation on Dynamics of Railway Track Pre-Stressed Concrete Sleepers

Field Investigation on Dynamics of Railway Track Pre-Stressed Concrete Sleepers

Finite element modelling of cracked railway pre-stressed concrete sleepers

Probabilistic Impact Fractures of Railway Prestressed Concrete Sleepers

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