TITLE:
Influence of the Randomness of Longitudinal Resistance of Ballast Bed on Track-Bridge Interaction
AUTHORS:
Weiwu Dai, Yunfei Zhang, Bowen Liu, Kaize Xie
KEYWORDS:
Continuous Welded Rail, Track-Bridge Interaction, Longitudinal Resistance of Ballast Bed, Normal Distribution
JOURNAL NAME:
Engineering,
Vol.15 No.11,
November
21,
2023
ABSTRACT: To get the influence of the randomness of longitudinal resistance of
ballast bed (LRBB) on track-bridge interaction, the statistical law of LRBB was
studied with existing test data and the Shapiro-Wilk test. Based on the
principle of track-bridge interaction, a rail-sleeper-bridge-pier integrated
simulation model that could consider the randomness of LRBB was established.
Taking a continuous beam bridge for the heavy-haul railway as an example, the
effect of the randomness of LRBB on the mechanical behavior of continuous
welded rail (CWR) on bridges under typical conditions was carefully examined
with a random sampling method and the simulation model. The results show that
the LRBB corresponding sleeper displacement of 2 mm obeys a normal
distribution. When the randomness of LRBB is considered, the amplitudes of rail
expansion force, rail bending force, rail braking force and rail broken gap all
follow normal distribution. As the standard deviations of the four indexes are
small, which indicates the randomness of LRBB has little effect on track-bridge
interaction. The distributions of the four indexes make it possible to design
CWR on bridges with the limit state method.