ANTI-SEISMIC BRIDGE Russian patent published in 2008 - IPC E01D18/00 

FIELD: construction, road construction.

SUBSTANCE: invention pertains to road construction, more specifically to construction of bridges with improved seismic stability. The technical outcome is the increased effectiveness of dynamic damping of oscillations of the support of the bridge. The anti-seismic bridge consists of shore pier, at least one intermediate support and, at least two superstructures, supporting of which is achieved through pliable and moveable supports, distinguished by that, on at least one of the supports of the two intermediate superstructures, there are supports through pliable supports. The other ends of these superstructures have support on other supports through moveable supports, and rigidity of the indicated pliable supports is determined from the formula c₁ = α₁ · k² · M₁ c₂ = α₂ · k² · M₂ (1) where: c₁ is rigidity of the pliable support of the first superstructure, c₂ is the rigidity of the pliable support of the second superstructure, k is the natural frequency of oscillation of the intermediate support, on which the pliable supports are mounted, M₁ and M₂ are the masses of the first and second superstructures, α₁ and α₂ are coefficients which depend on the relative mass of the superstructures.

EFFECT: increased effectiveness of dynamic damping of oscillations of the support of the bridge.

6 cl, 7 dwg