Investigation of dynamic cable-deck interaction in a physical model of a cable-stayed bridge. Part II: Seismic response

The present paper describes an investigation of the effect of dynamic cable interaction with the deck and towers in the seismic response of a cable-st ayed bridge. This study involved shaking table tests performed on a physica l model of Jindo bridge, in order to validate two alternative numerical mod els, which differ in terms of consideration of coupled cable/deck and tower s modes. The response to artificial accelerograms was calculated and correl ated with measured data. Additional numerical simulations are presented in order to clarify the role that cables play in the attenuation or amplificat ion of the structural response. It was found that the cable interference wi th global oscillations may cause a decrease of the bridge response. However , this 'system damping' may not develop in the case where a narrow-band exc itation is applied, causing large amplitude of vibrations of some cables, w ith significant non-linearity, and inducing higher-order modes. Copyright ( C) 2000 John Wiley & Sons, Ltd.