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Structural Engineering and Mechanics
  Volume 26, Number 2, May30 2007 , pages 111-126

Seismic response of a monorail bridge incorporating
train-bridge interaction
Chul-Woo Kim and Mitsuo Kawatani

    Dynamic responses of the bridge for a straddle-type monorail subjected to the ground motion of high probability to occur are investigated by means of a three-dimensional traffic-induced vibration analysis to clarify the effect of a train?s dynamic system on seismic responses of a monorail bridge. A 15DOFs model is assumed for a car in the monorail train. The validity of developed equations of motion for a monorail train-bridge interaction system is verified by comparison with the field-test data. The inertia effect due to a ground motion is combined with the monorail train-bridge interaction system to investigate the seismic response of the monorail bridge under a moving train. An interesting result is that the dynamic system of the train on monorail bridges can act as a damper during earthquakes. The observation of numerical results also points out that the damper effect due to the dynamic system of the monorail train tends to decrease with increasing speed of the train.
Key Words
    seismic response; damper effect; monorail train-bridge interaction; straddle-type monorail
Department of Civil Engineering, Osaka University, Osaka 565-0871, Japan

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