Rail Strain under Different Loads and Conditions as a Source of Information for Operation

Bruner, M.; Cortis, Daniele; Malavasi, Gabriele

doi:10.4203/ccp.110.161

Cited by 4 publications

(3 citation statements)

References 4 publications

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“…Several researchers successfully used and validated this strain gauge-based monitoring system in the field to measure vertical wheel loads applied to the rail. [2][3][4][5][6][7][8][9][10][11][12][13] In 2020, Lima et al 14 used the crib circuit to measure vertical wheel-rail contact forces for assessing the performance of Engineered Interspersed Concrete (EIC) ties. In 2018, Edwards et al 15 performed tests to revise the design load considerations for track components.…”

Section: Introductionmentioning

confidence: 99%

A study of vertical tie reaction forces in ballasted railroad tracks through field instrumentation and numerical modeling

Rabbi

Bruzek

Sussmann

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part F:

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This manuscript presents findings from an ongoing research study at Oklahoma State University studying different factors that affect vertical tie reaction forces in ballasted railroad tracks. A combined approach involving field instrumentation and numerical modeling has been adopted for this purpose. Measurements of tie reactions can indicate the load distribution patterns and quality of vertical support along a track. Locations where tie support conditions are not adequate can develop geometry defects, ultimately leading to component failure. Three different approaches are adopted in this study to measure the forces being transmitted through the rail-tie interface; this is equal to the tie reaction force. The field instrumentation effort validates an alternative method to measure forces at the rail-tie interface using rail-mounted strain gauges. Results from this approach are compared to two other conventional methods of force measurement, i.e. through the use of load cells (LC), and an instrumented tie plate (ITP). A validated 3-dimensional Finite Element (FE) model is used to support the field-observed trends, and explain any observed discrepancy. Parametric analyses using the FE model identify different factors that can contribute to the rail-tie interaction force, thus affecting the instrumentation results. The strain gauge-based approach, using the concept of differential shear strain measurement, has been established as a suitable method for tie reaction force measurement. Exact measurement of the tie reaction force can be ensured through proper installation of the strain gauges, away from possible boundary effects.

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Section: Introductionmentioning

confidence: 99%

A study of vertical tie reaction forces in ballasted railroad tracks through field instrumentation and numerical modeling

Rabbi

Bruzek

Sussmann

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part F:

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show abstract

“…Instead, other systems use load cells under the fastenings of the sleepers [13] or measure the shear strains of the rail web in specific longitudinal sections [14]. The literature review confirms that the rail, just as the wheel [15], can be used as useful, feasible, suitable, measuring device for the monitoring and the study of the wheel-rail interaction [16], for the running safety and the maintenance of the railway networks.…”

Section: Introductionmentioning

confidence: 99%

“…The collaboration is still ongoing. Systems for the monitoring of wheel-rail lateral contact forces are being investigated [16,18]. The use of these systems, combined with those regarding vertical loads, could allow in the future the evaluation of the derailment ratio (Y/Q).…”

Section: Introductionmentioning

confidence: 99%

Self-Diagnosis Method for Checking the Wayside Systems for Wheel-Rail Vertical Load Measurement

Cortis¹,

Giulianelli²,

Malavasi³

et al. 2018

Transport Problems

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Nowadays, wayside measurement systems of wheel-rail contact forces have acquired great relevance for the monitoring of rolling stock, especially for freight trains. Thanks to these solutions, infrastructure managers can check and monitor the status of rolling stock and, when necessary, impose corrective actions for the railway companies. On the other hand, the evaluation of contact forces is part of the rolling stock authorisation process [1] and a mainstone for the study of the running stability. The data provided by these measurements could give useful information to correlate the wear of the track with the frequency of applied loads, helping in the development of a better maintenance strategy of railway networks [2]. In this paper, the monitoring of vertical forces is based on the SMCV (Vertical Loads Monitoring System) method, where shear strains of the rail web are measured with a simple combination of four electrical strain gauges, placed on both sides of the rail web along each span. The research has identified self-diagnosis methods for the SMCV system to ensure the reliability and the quality of the measurements and to extend the knowledge of the system. The recorded signals have been processed and converted into easily interpretable physical quantities by means of MATLAB ® algorithm.

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Estimation of the wheel-rail lateral contact force through the analysis of the rail web bending strains

et al. 2017

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Rail Strain under Different Loads and Conditions as a Source of Information for Operation

Cited by 4 publications

References 4 publications

A study of vertical tie reaction forces in ballasted railroad tracks through field instrumentation and numerical modeling

A study of vertical tie reaction forces in ballasted railroad tracks through field instrumentation and numerical modeling

Self-Diagnosis Method for Checking the Wayside Systems for Wheel-Rail Vertical Load Measurement

Estimation of the wheel-rail lateral contact force through the analysis of the rail web bending strains

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