National Transport Library Research Database

Quantifying complex track stiffness response (Quantifying complex track stiffness response)

  • Dijkstra, Jelke
  • Chalmers tekniska högskola AB, Universitet eller högskola, 556479-5598
Sponsors, duration, budget: Trafikverket ; 2017-08-15 -- 2021-02-15 Registration number:
  • Trafikverket 2016/106277
Subject(s): Online resources: Abstract: Originaltitel HHJV Övergångszoner förändring av styvhet på kort sträcka. In most (high-speed, HS) line infrastructure, very strict alignment and stiffness variations are prescribed. These perhaps result in overly costly track configurations being pre-scribed to prevent additional maintenance issues resulting from track degradation down the line. At present the complete system of railway head, sleepers, subgrade (slab), embankment and subsoil are not considered in setting these guide lines. Something that will be addressed in this project. Trafikverket requires adequate design guidelines for regular and HS railway systems that ensure trouble free low maintenance operation of their track with smooth transitions, that incorporate short term dynamic loading considerations (e.g. vibrations from a single bogie) and accumulated effects over long-term loading (e.g. 60 yrs. operational life). The main issue is to establish the bounds of permissible stiffness distributions along & below the track, this includes track alignment, during its life-time that minimises construction and maintenance costs. Here, ‘stiffness’ refers to the evolving track-subgrade-soil system. The project aims to use a combination of quasi-static and dynamic numerical analyses to establish a generalised guideline, in terms of a maximum allowable variation in track compliance (rather than alignment alone), to fulfil the operational needs of a railway track. Trafikverket kräver lämpliga riktlinjer för dimensionering av vanliga och höghastighets järnvägssystem som garanterar problemfri drift och underhåll av deras spår, med mjuka övergångszoner där hänsyn tas till kortsiktiga dynamiska last effekter (t.ex. vibrationer från en enda boggi) och ackumulerade effekter över långvarig belastning (t.ex. 60 år. livslängd). Den viktigaste frågan är att fastställa gränserna för tillåtna styvhetsfördelning längs och nedanför spåret, detta inkluderar banjustering under spårets livstid, som minimerar bygg- och underhållskostnader. Här avser "styvhet" den evolverande spårgrund-marksystemet. Projektet syftar till att använda en kombination av kvasi-statiska och dynamiska numeriska analyser för att fastställa en allmän riktlinje, i termer av en maximalt tillåten variation hos spåret (snarare än enbart anpassning i plan), för att uppfylla de operativa behoven hos ett järnvägsspår.Abstract: In most high-speed line infrastructure, very strict alignment and stiffness variations are prescribed. These perhaps result in overly costly track configurations being pre-scribed to prevent additional maintenance issues resulting from track degradation down the line. At present the complete system of railway head, sleepers, subgrade (slab), embankment and subsoil are not considered in setting these guidelines. Something that will be addressed in this project. Trafikverket (Swedish Transport Aministration) requires adequate design guidelines for regular and high speed railway systems that ensure trouble free low maintenance operation of their track with smooth transitions, that incorporate short term dynamic loading considerations (e.g. vibrations from a single bogie) and accumulated effects over long-term loading (e.g. 60 years operational life). The main issue is to establish the bounds of permissible stiffness distributions along and below the track, this includes track alignment, during its life-time that minimises construction and maintenance costs. Here, stiffness refers to the evolving track-subgrade-soil system. The project aims to use a combination of quasi-static and dynamic numerical analyses to establish a generalised guideline, in terms of a maximum allowable variation in track compliance (rather than alignment alone), to fulfil the operational needs of a railway track.
Item type: