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http://dx.doi.org/10.12989/sem.2016.59.2.277

Study of ground vibration induced by high-speed trains moving on multi-span bridges  

Ju, S.H. (Department of Civil Engineering, National Cheng-Kung University)
Publication Information
Structural Engineering and Mechanics / v.59, no.2, 2016 , pp. 277-290 More about this Journal
Abstract
This paper investigates the ground vibration induced by high-speed trains moving on multi-span continuous bridges. The dynamic impact factor of multi-span continuous bridges under trainloads was first determined in the parametric study, which shows that the dynamic impact factor will be large when the first bridge vertical natural frequency is equal to the trainload dominant frequencies, nV/D, where n is a positive integer, V is the train speed, and D is the train carriage interval. In addition, more continuous spans will produce smaller dynamic impact factors at this resonance condition. Based on the results of three-dimensional finite element analyses using the soil-structure interaction for realistic high-speed railway bridges, we suggest that the bridge span be set at 1.4 to 1.5 times the carriage interval for simply supported bridges. If not, the use of four or more-than-four-span continuous bridges is suggested to reduce the train-induced vibration. This study also indicates that the vibration in the train is major generated from the rail irregularities and that from the bridge deformation is not dominant.
Keywords
finite element analysis; high-speed train; impact factor; multi-span bridge; resonance; trainload dominant frequency; vibration;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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