Abstract
Viscous dampers are important devices to dissipate the vibration energy of long-span bridges. In the paper, nonlinear time history analysis was used to study the effects of this type of dam-per on suspension bridges. The influence of nonlinear viscous dampers on the seismic response of long-span suspension bridges was analyzed, which was based on a real project. The quantitative relationship between the displacement of the bridge girder and the tower with the damping coefficient and velocity index was investigated. The results showed that the displacement of the bridge girder under earthquakes can be effectively reduced by selecting the appropriate damping coefficient and velocity index of the nonlinear viscous dampers, and the best energy dissipation and seismic reduction effect for long-span suspension bridges can be obtained.
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