Affiliations: School of Civil Engineering & Architecture,
Railway Campus, Central South University, 22 Shao-shan-nan Road, Changsha,
Hunan 410075, P.R. China
Note: [] Corresponding author. E-mail: pinglou@mail.csu.edu.cn or
pingloucsu@126.com
Abstract: Based on energy approach, the equations of motion in matrix form for
the railway freight vehicle-bridge interaction system are derived, in which the
dynamic contact forces between vehicle and bridge are considered as internal
forces. The freight vehicle is modelled as a multi-rigid-body system, which
comprises one car body, two bogie frames and four wheelsets. The bogie frame is
linked with the car body through spring-dashpot suspension systems, and the
bogie frame is rigidly linked with wheelsets. The bridge deck, together with
railway track resting on bridge, is modelled as a simply supported
Bernoulli-Euler beam and its deflection is described by superimposing modes.
The direct time integration method is applied to obtain the dynamic response of
the vehicle-bridge interaction system at each time step. A computer program has
been developed for analyzing this system. The correctness of the proposed
procedure is confirmed by one numerical example. The effect of different beam
mode numbers and various surface irregularities of beam on the dynamic
responses of the vehicle-bridge interaction system are investigated.
