Dynamics Analysis of A High-Speed Train Moving on Soft Ground

The 3D finite element analysis were used in this
research to investigate surface ground
vibration due to a moving train. This 3D finite
element mesh includes the soil and bridge meshes
modeled by using the 3D 8-node element. After FEM
analysis, 1/3 octave band method was used in
frequency domain to compute the vibration from the
ground velocity in time domain. The resonant
vibration in this study can be clearly seen from the
finite element result. As an illustration of the
numerical analysis, the train speed v approaches the
Rayleigh wave velocity in supporting soil; a large
peak has been occurred in the figure approaching
track-soil critical velocities. However, it does not
have a large increase in generated ground vibrations
in the bridge-train-soil model simulated by the
finite element method. The vehicle-bridge resonance
triggers the greater part of vibrations than the
vehicle-soil resonance for the three-dimensional
vehicle-bridge-soil system. To be valid for avoid
bridge and train resonance, the first dominated
train frequency and the first bridge natural
frequency in each direction should be as different
as possible.

Autorentext

Chang. Chin-Chuan (M.S., National Cheng Kung University at Tainan, Taiwan) Works as Civil Engineer in China Steel Coporation, Kaohsiung City, Taiwan. Professional Experiences: RC & Steel structural planing & design for building Structure about iron-marking plant, Vibrating machine foundation design, etc..

Klappentext

The 3D finite element analysis were used in this research to investigate surface ground vibration due to a moving train. This 3D finite element mesh includes the soil and bridge meshes modeled by using the 3D 8-node element. After FEM analysis, 1/3 octave band method was used in frequency domain to compute the vibration from the ground velocity in time domain. The resonant vibration in this study can be clearly seen from the finite element result. As an illustration of the numerical analysis, the train speed v approaches the Rayleigh wave velocity in supporting soil; a large peak has been occurred in the figure approaching track-soil critical velocities. However, it does not have a large increase in generated ground vibrations in the bridge-train-soil model simulated by the finite element method. The vehicle-bridge resonance triggers the greater part of vibrations than the vehicle-soil resonance for the three-dimensional vehicle-bridge-soil system. To be valid for avoid bridge and train resonance, the first dominated train frequency and the first bridge natural frequency in each direction should be as different as possible.