Dynamic Loads Caused By Freight Trains With Wheelset Loads of 250 kN
Ключевые слова:
Energy balance, Damage criteria, Deterministic load, Stochastic load, Winkler beamАннотация
Increasing wheelset loads of freight trains to 250 kN leads to the question of whether the additional dynamic loads on the track are permissible. Moreover, the operating company (DB, German Railways) was interested in any differences of dynamic load caused by 2 axle and 3 axle bogies with their respective maximum axle loads. Dynamic loads on tracks consist of a low-frequency part caused by train geometry and train velocity, and a highfrequency part due to additional stochastic loads caused by irregularities of wheels, rails, etc. We performed seismic measurements during the passage of ore trains at track sections in Northern Germany where wagons with two and three axles per bogie were in use. Additionally, parameter studies with a Winkler beam model allowed comparison of the low-frequency behaviour of both types of wagon regarding particle velocity and displacement. The measurements are used to estimate the stochastic loads after filtering. The total load on track and subsoil caused by wagons with 6 axles and wheelset loads of 250 kN is compared with wagons with 4 axles and wheelset loads of 225 kN travelling at the same train speed.
