Bankonstruktionens egenskaper och deras påverkansgrad på nedbrytningen av spårfunktionen

Karin Edvardsson

The main objective of the report is to identify the characteristics that influence the degradation; defined as the condition change, of the super- and substructure of the railway construction. The objective is also to rate the degree of influence of these properties as well as give an account for the effect relationships to the extent that this is possible. In Sweden there are currently about 15,000 km of railway, of which 13 600 km are administered by the Swedish Transport Administration. For this railway facility, there is today a lack of overall maintenance strategies that describes how the maintenance should be carried out for optimal cost efficiency. There is therefore a need to improve the ability to assess the condition and predict the future condition development for different track types in a lifetime perspective. First of all, basic knowledge regarding the condition data collected today and a comprehensive identification of the degradation characteristics affecting the railway facility, as well as the degree of their influence and their effect relationship, are needed. Identified degradation properties include such that affect the super- and substructure but does not include switches, ducting, electrical systems, signal systems or telecommunication. To create reliable life cycle cost models, that enable prioritization and planning of maintenance operations in a cost optimal way, focus on the data inputs to the model is required. Many components of the railway system have complex degradation processes. It is also important, when choosing maintenance strategy, to look at the parts that are associated with high costs, where both the cost of operation and frequency of operation are considered. The greatest impact, of the properties assessed to affect the degradation of the railway construction, has traffic load; where both the load and the frequency are of importance. Then follows, in descending order; drainage, the drainage system, degradation of ballast, rails and sleepers, ballast pollution, track geometry (curves and joints), presence of joints, subgrade stability and vehicle characteristics. The project was done as a comparative study, where degradation properties and effect relationships identified through literature studies have been compared with the corresponding results obtained by qualitative studies, i.e. interviews with experts in the field.



The 6st Humanist Conference

The 6th HUMANIST Conference will take place 13-14 June 2018 in the Hague, The Netherlands. The scope of the conference covers a wide range of topics on Human Factors in Transport. Tania Willstrand and Alexander Eriksson will present their research results.



VTI will develop simulators for ambulance staff

VTI has initiated a pilot study for paramedics with the Centre for Teaching & Research in Disaster Medicine and Traumatology and Linköping University. The aim is to give ambulance staff the opportunity to practice critical medical tasks in a moving vehicle in...


Unique electrified road opens in Sweden

The world’s first electrified road recharging the batteries of cars and trucks while driving opened in Sweden. The Swedish Minister for Infrastructure, Tomas Eneroth, was at the formal inauguration of the electrified road on April 11, 2018. VTI is one of 22...


Swedish road safety spreads internationally

Sweden is a leading country in terms of road safety, and the research conducted by the Swedish National Road and Transport Research Institute (VTI) has contributed to increased safety. VTI’s remit includes disseminating research results and keeping up to date...


A greater understanding of cyclists' behaviour

Cyclists are often accused of not following traffic rules and being hooligans on the road. New research shows that there is no support for this perception. "Our observations reveal no such general anarchy" says Sonja Forward, researcher at VTI.


New technology for road surface measurement tested

VTI has tested a new scanning-laser technology for road surface measurement. The tests show the new technology for comprehensive transverse-profile measurement provides dependable values in measuring transverse profile and rut depth.


Ulf Sandberg has been presented with the TTI Lifetime Achievement Award 2018

VTI’s Senior Research Leader Ulf Sandberg has been presented with the TTI Lifetime Achievement Award 2018 for his work on research into tyres and road surface.