Sökning: "Ballast instability"

Hittade 2 uppsatser innehållade orden Ballast instability.

1. 1. Reliability-Based Sensitivity Analysis of the Dynamic Response of Railway Bridges

   Master-uppsats, KTH/Bro- och stålbyggnad

   Författare :Hasan Al-Zubaidi; [2022]
   Nyckelord :Railway bridges; High-speed trains; Simply supported beam; Global sensitivity analysis; Uncertainty quantification; Reliability; Ballast instability; Running safety; Passenger comfort;

   Sammanfattning : In response to the planned increase in operational speeds and axle loads of passengertrains that may lead to resonance-induced excessive vibrations in railway bridges,recent studies examined the reliability of bridges concerning train running safety andpassenger comfort limit states. In this respect, valuable information regarding theimportance of input variables can be obtained by conducting Sensitivity Analysis (SA). LÄS MER

3. 2. Traffic induced vibrations on a portal frame railway bridge : Comparison of theory and measurements

   Master-uppsats, KTH/Bro- och stålbyggnad; KTH/Järnvägsgruppen, JVG

   Författare :Andrea Llorens García; [2011]
   Nyckelord :Frame bridge; Dynamics; Support stiffness; High speed train; Ballast instability; Moving loads;

   Sammanfattning : The effect of different vertical support stiffness of a frame railway bridge is investigated in this study. Due to the dynamic loads of the high speed trains that run over the railway bridges, the response of these structures is far from the static effects. LÄS MER