The arrangement principle of damper for long span cable-stayed bridge adopting full-floating system is discussed based on one actual long span cable-stayed bridge, and considering the pile-soil interaction, the spatial finite element model of was build. According to modal damping of strain energy theory, the effect of damping of superstructure, substructure and damper was evaluated, so difference damping of difference component can be induced in FEM of bridge. Then, parameter optimization of fluid viscous damper was processed and the optimal damping velocity index and damping coefficient were obtained, at the same time, effect of energy dissipation for response of bridge under earthquake was analyzed. Researched result show the displacement of main tower, displacement of girder, bending moment at the bottom of main tower of bridge adopting viscous dampers is decreased to 60.4%, 56.7%, 71.8% of ordinary bridge adopting floating system respectively. With the increase of damping coefficient and decrease of damping velocity index, displacement of girder, main tower and damper is decreased and bending moment at bottom of main tower is monotone decrease. The control effect of bending moment at bottom of main tower will be unchangeable when the increase of damping coefficient and decrease of damping velocity index receive a certain value.
Key words
cable-stayed bridge /
earthquake effect /
energy dissipation /
floating system /
fluid viscous damper
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