TY - GEN
T1 - Track performance modeling under mixed traffic
AU - Huang, Hai
PY - 2012
Y1 - 2012
N2 - The majority US high speed trains are sharing the same track network with freight trains, which will bring different load patterns i.e. different peak loads, speeds, and loading sequence and durations to the current track infrastructure. The change in loading characteristics especially when train is moving at so called "Critical Speeds" may however cause unfavorable track performances, for instance increase in track settlement (both in ballast and the subgrade soil). Effort has been taken in this research to investigate the impact of different load patterns on the track settlement accumulation. A fully coupled dynamic track model consists of a vehicle, rail-tie-ballast "Sandwich" upper structure, and a finite 3D soil substructure model is developed and utilized to obtain the loading pulses and pulse combinations introduced by different traffic patterns. A Discrete Element Modeling approach is then employed to simulate the ballast settlement under those realistic loading pulses and pulse combinations. Results and conclusions will be highlighted and recommendations will be made in the end.
AB - The majority US high speed trains are sharing the same track network with freight trains, which will bring different load patterns i.e. different peak loads, speeds, and loading sequence and durations to the current track infrastructure. The change in loading characteristics especially when train is moving at so called "Critical Speeds" may however cause unfavorable track performances, for instance increase in track settlement (both in ballast and the subgrade soil). Effort has been taken in this research to investigate the impact of different load patterns on the track settlement accumulation. A fully coupled dynamic track model consists of a vehicle, rail-tie-ballast "Sandwich" upper structure, and a finite 3D soil substructure model is developed and utilized to obtain the loading pulses and pulse combinations introduced by different traffic patterns. A Discrete Element Modeling approach is then employed to simulate the ballast settlement under those realistic loading pulses and pulse combinations. Results and conclusions will be highlighted and recommendations will be made in the end.
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U2 - 10.1115/JRC2012-74179
DO - 10.1115/JRC2012-74179
M3 - Conference contribution
AN - SCOPUS:84892631374
SN - 9780791844656
T3 - 2012 Joint Rail Conference, JRC 2012
SP - 147
EP - 152
BT - 2012 Joint Rail Conference, JRC 2012
PB - American Society of Mechanical Engineers (ASME)
T2 - 2012 Joint Rail Conference, JRC 2012
Y2 - 17 April 2012 through 19 April 2012
ER -