Simulation of vertical dynamic vehicle–track interaction using a two-dimensional slab track model

Artikel i vetenskaplig tidskrift, 2018

The vertical dynamic interaction between a railway vehicle and
a slab track is simulated in the time domain using an extended
state-space vector approach in combination with a complex-valued
modal superposition technique for the linear, time-invariant and
two-dimensional track model. Wheel–rail contact forces, bending
moments in the concrete panel and load distributions on the supporting
foundation are evaluated. Two generic slab track models
including one or two layers of concrete slabs are presented.
The upper layer containing the discrete slab panels is described
by decoupled beams of finite length, while the lower layer is
a continuous beam. Both the rail and concrete layers are modelled
using Rayleigh–Timoshenko beam theory. Rail receptances for
the two slab track models are compared with the receptance of
a traditional ballasted track. The described procedure is demonstrated
by two application examples involving: (i) the periodic
response due to the rail seat passing frequency as influenced by
the vehicle speed and a foundation stiffness gradient and (ii) the
transient response due to a local rail irregularity (dipped welded
joint).