چكيده لاتين :
In the past few years the issue of excessive footbridge lateral vibrations attracted great attention. There
are three possible mechanisms that stand for lateral vibration; direct resonance, dynamic interaction, and
internal resonance. This paper investigates direct resonance which is activated if the pedestrian excitation
is in resonance with a specific mode of vibration. A single double-foot force model for the lateral
component of force is employed. Based on it, the footbridge random load, in which pedestrians are
modeled as loads interring the footbridge with average time intervals, is modeled. In this model, a
stochastic approach is employed to calculate the acceleration power spectral density in any arbitrary
position of the footbridge. Resonant effects are observed when the footbridge natural frequencies fall
within the frequency range of crowd excitations. To suppress the excessive acceleration for human
normal walking comfort, the application of tuned mass damper system, is shown to be satisfying.