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Structural Engineering and Mechanics
  Volume 12, Number 3, September 2001 , pages 267-281

Vertical vibrations of a multi-span beam steel bridge induced by a superfast passenger train
M. Klasztorny(Poland)

    Transient and quasi-steady-state vertical vibrations of a multi-span beam steel bridge located
on a single-track railway line are considered, induced by a superfast passenger train, moving at speed
120-360 km/h. Matrix dynamic equations of motion of a simplified model of the system are formulated
partly in the implicit form. A recurrent-iterative algorithm for solving these equations is presented.
Excessive vibrations of the system in the resonant zones are reduced effectively with passive dynamic
absorbers, tuned to the first mode of a single bridge span. The dynamic analysis has been performed for a
series of types of bridges with span lengths of 10 to 30 m, and with parameters closed to multi-span
beam railway bridges erected in the second half of the 20 th century.
Key Words
    railway bridge; multi-span bridge; beam steel bridge; superfast train; moving load; transient vibrations; quasi-steady-state vibrations; passive dynamic absorbers; vibration control.
M. Klasztorny, Institute of Mechanics and Design, Warsaw University of Technology, Warsaw 02524, Poland

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