Exploring the relationship between vertical and lateral forces, speed and superelevation in railway curves

dc.contributor.authorPowell, Alex F.
dc.contributor.authorGrabe, Petrus Johannes
dc.contributor.emailgrabe@up.ac.zaen_ZA
dc.date.accessioned2018-07-17T05:45:25Z
dc.date.available2018-07-17T05:45:25Z
dc.date.issued2017-09
dc.description.abstractThe research described in this paper is based on an experiment which involved running a test train through a curve at various speeds, changing the cant of the curve by tamping and repeating the train runs. The cant was changed due to high wheel wear rates. The curve already had a cant deficiency, and this cant deficiency was subsequently increased by reducing the curve’s cant. Assessing the before and after tamping test data validated the existence of the expected relationships between the vertical and lateral rail forces, the speed and the cant. The change in cant had a minimal effect on the magnitude of the vertical forces, although a transfer of loading between the high and low legs did occur. The theory indicates that the 14% reduction in cant in this curve, given all of the other curve characteristics, should have resulted in an increase in the lateral forces. There was, however, a roughly 50% reduction in the maximum lateral forces, after the cant had been reduced, which can be explained from a train dynamics point of view. In addition, there was an increase in safety, due to a reduced derailment ratio at this curve’s normal operating speed of 85 km/h. It is not unreasonable to presume that a 50% reduction in the maximum lateral forces could lead to a halving of the wear rate of the rail and wheels in this curve, with similar results to be expected in other curves on the rail network.en_ZA
dc.description.departmentCivil Engineeringen_ZA
dc.description.librarianam2018en_ZA
dc.description.sponsorshipThe Chair in Railway Engineering at the University of Pretoria (sponsored by Transnet Freight Rail)en_ZA
dc.description.urihttp://www.journals.co.za/ej/ejour_civileng.htmlen_ZA
dc.identifier.citationPowell AF, Gräbe PJ. Exploring the relationship between vertical and lateral forces, speed and superelevation in railway curves. 25 J. S. Afr. Inst. Civ. Eng. 2017:59(3), Art. #1736, 11 pages. http://dx.DOI.org/ 10.17159/2309-8775/2017/v59n3a4.en_ZA
dc.identifier.issn1021-2019 (online)
dc.identifier.other10.17159/2309-8775/2017/v59n3a4
dc.identifier.urihttp://hdl.handle.net/2263/65762
dc.language.isoenen_ZA
dc.publisherSouth African Institution of Civil Engineeringen_ZA
dc.rightsAll the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution Licenseen_ZA
dc.subjectVertical forcesen_ZA
dc.subjectLateral forcesen_ZA
dc.subjectSuperelevation (or cant)en_ZA
dc.subjectSpeeden_ZA
dc.subjectRailway curvesen_ZA
dc.subject.otherEngineering, built environment and information technology articles SDG-09
dc.subject.otherSDG-09: Industry, innovation and infrastructure
dc.titleExploring the relationship between vertical and lateral forces, speed and superelevation in railway curvesen_ZA
dc.typeArticleen_ZA

Files

Original bundle

Now showing 1 - 1 of 1
Loading...
Thumbnail Image
Name:
Powell_Exploring_2017.pdf
Size:
859.3 KB
Format:
Adobe Portable Document Format
Description:
Article

License bundle

Now showing 1 - 1 of 1
Loading...
Thumbnail Image
Name:
license.txt
Size:
1.75 KB
Format:
Item-specific license agreed upon to submission
Description: