Sökning: "ballasted track"

Visar resultat 6 - 10 av 22 uppsatser innehållade orden ballasted track.

  1. 6. Ogräsbekämpning på järnväg : En jämförande studie av alternativ till glyfosat

    Master-uppsats, Uppsala universitet/Institutionen för geovetenskaper

    Författare :Clara Magnusson; [2020]
    Nyckelord :Railway; weed management; weed control; maintenance; fixed track; slab-track; glyphosate; pelargonic acid; hot water; steam; electricity; Järnväg; ogräsbekämpning; underhåll; ballastfri; glyfosat; pelargonsyra; hetvatten; vattenånga; elektricitet;

    Sammanfattning : På Sveriges järnvägsnät bekämpas ogräs med det kemiska bekämpningsmedlet glyfosat. En omställning är nu på gång och fler bekämpningsmetoder behöver introduceras, bland annat för att motverka resistensutveckling hos ogräsen. LÄS MER

  3. 7. Railway bridges with floating slab track systems : Numerical modelling of rail stresses - Dependence on properties of floating slab mats

    Uppsats för yrkesexamina på avancerad nivå, Luleå tekniska universitet/Byggkonstruktion och -produktion

    Författare :Daniel Kostet; [2018]
    Nyckelord :ballasted track; bridge; elastic mat; expansion; finite element method FEM ; finite element analysis FEA ; floating slab mat; interaction; International union of railways UIC ; non-ballasted track; SOFiSTiK; ballasterat spår; ballastfritt spår; bro; dilatationsfogar; finita elementmetoden FEM ; finit elementanalys FEA ; fixerat spår; interaktion; Internationella järnvägsunionen UIC ; SOFiSTiK; vibrationer; vibrationsdämpande matta;

    Sammanfattning : The increased use of continuously welded rails in the railway systems makes it necessary to increase the control of the rail stresses to avoid instability and damages of the rails. Large stresses are especially prone to appear at discontinuities in the railway systems, such as bridges, due to the interaction between the track and the bridge. LÄS MER

  4. 8. Decision-making model for track system of high-speed rail lines : Ballasted track, ballastless track or both?

    Master-uppsats, KTH/Byggvetenskap

    Författare :Veronika Sárik; [2018]
    Nyckelord :;

    Sammanfattning : During the 50 years of existence of high speed railways, the track structure solutions have developed both in number and in type. As of today, in case of conventional railway, there are 2 main types one could mention: ballasted and ballastless track solutions. LÄS MER

  5. 9. Dynamic Soil-Structure Interaction of a Portal Frame Railway Bridge - Numerical Analysis on a Case Study Bridge

    Master-uppsats, KTH/Bro- och stålbyggnad

    Författare :Rita Ikzer; [2018]
    Nyckelord :Dynamic Analysis; Soil-Structure Interaction; Damping; Railway Bridge; Portal Frame Bridge; Full FE-Modeling; Simplified Modeling; Dynamisk analys; Jord-struktur interaktion; Dämpning; Järnvägsbro; Plattrambro; Detaljerad FE-modellering; Förenklad modellering;

    Sammanfattning : In the field of structural dynamics, a broader knowledge about relevant phenomena that affect the dynamic behavior of railway bridges is vital for structural engineers and design code administrators. The knowledge might benefit in an increased understanding of e.g. the resonance phenomena, and in improvements of the existing design codes. LÄS MER

  7. 10. Comparison of ballasted and ballastless bridges for high speed trains

    Master-uppsats, KTH/Bro- och stålbyggnad

    Författare :David Matos Sánchez; Maša Nikolic; [2016]
    Nyckelord :High-speed train; concrete bridge; beam bridge; dynamic; 3D dynamic;

    Sammanfattning : The purpose of the project is to investigate the difference in performance between ballasted and ballastless railway bridges dedicated to high speed trains by taking into account both static and dynamic requirements. The main questions are: a) whether choosing a ballastless bridge results in a more slender section due to the lower self-weight b) if the design of bridges for high speed trains is governed by the static or by the dynamic requirements. LÄS MER