Speed-dependent devices

Spring fluid viscous dampers are cylinder/piston assemblies characterized by a constitutive bond in which reaction force F depends both on speed v and on displacement x, according to law F=F0+Kx+Cvα, where F0 is pre-load force (if any), K is stiffness, C is the damping constant and α=0.15. Pre-load force can be useful to avoid displacements for horizontal service actions. Experimental hysteretic cycles of a spring fluid viscous damper without pre-load force. Spring fluid viscous dampers for the Badia Nuova flyover on highway A1. Spring fluid viscous dampers installed in Rio Higuamo Bridge (Dominican Republic).