Abstract:
In design of damper energy dissipation in a very deterministic and sophisticated manner is needed the isolation systems usually made of viscoelastic material damps only the modal natural frequencies of seismic-vehicular vibrations and larger deformation but inadequate structural hysteresis. In MR damper fluid leakage is the key issue, requires electric supply as well as costlier sensor which on seismic fragility gets damaged, so they are less reliable but active dampers modifies themselves according to state of structure using electronic acquisition and feedback control systems, but these are affected by catastrophe. So, moving towards passive damping includes displacement-activated metallic, friction and viscoelastic Dampers, motion activated tuned dampers (TMD, TLD) while velocity activated viscous dampers. Passive dampers are reliable during havoc but unable to modify according to need they are velocity, displacement dependent.
Presenting seismic-vehicular damping making dampers independent of velocity and increasing sensitivity
of metallic damper as well as stiffness using displacement-controlled loading and activation sensitive yield points using different boundary conditions with modified steel rods for applying loading to enhance structural hysteresis and by introducing the lamination of viscoelastic materials we will be independent of velocity-controlled boundary conditions by performing material damping using polyurethane to damp resonance of first modes of vibrations lying at frequencies in the order of thousands which are very higher than the dynamic response of bridge vehicle interaction by introducing thin laminates of viscoelastic polyurethane. Parametric study not only reveals the sensitivity of plastic deformation but also interrelated to dimensions of the U-shaped structural steel also by reducing the cyclic numerical error using combined hardening parameters.
