Cable vibrations significantly influence the seismic response of cable-stayed bridges with conventional steel cables. Cables made of composite materials such as carbon fiber reinforced plastics have similar elasticity modulus and tensile strength to those of steel cables. However, their mass density is lower by 4 to 5 times. This will significantly influence the vibration characteristics of the stay cables and hence its interaction with the bridge response to seismic excitations. This is demonstrated by comparing the seismic response of two cable-stayed bridges using conventional steel cables and carbon fiber reinforced plastic cables. The differences in modal characteristics and the nonlinear effects of cable sag on the static response are also discussed.
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