Abstract
A new passive hydromechanical system for damping sustained oscillations in buildings and bridges under earthquakes or wind is introduced, which is most effective in resonance conditions. The system is characterized by simplicity of construction and high functional efficiency, yet consumes very little external energy to replace oil lost by leakage. The basis of the system is two spring-loaded check-valves (or single-stage relief valves) installed in a braking cylinder fixed to the ground and whose piston exerts control action on the structure via cables of appropriate axial stiffness. The configuration and functioning of the braking system are described and its performance evaluated for vertical multistorey structures and for horizontal girder structures.
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