DETERMINING THE INFLUENCE OF PERFORATED STEEL SHIMS ON STEEL REINFORCED ELASTOMERIC BEARING PAD

Important buildings like bridges, hospitals, and nuclear power stations may benefit greatly from seismic isolation to reduce their exposure to earthquake risk. In the event of the design earthquake, seismically separated buildings should stay elastic and sustain little to no damage. Seismic isolation devices, such as steel-reinforced elastomeric bearings, are widely employed to safeguard bridges and other vital infrastructure from damage. Isolators are essential components of a seismically isolated building and should sustain little to no damage even when subjected to earthquake shaking over the design threshold. The primary seismic index of grouted metal corrugated duct connected precast RC bridge columns was found to be comparable to that of cast-in-place bridge columns. In order to keep a single thick rubber from bulging laterally and to maintain its original stiffness and energy absorption capability, a layered elastomeric pad is proposed for use in the precast bridge column. If a steel tube is placed in the centre of the elastomeric pad, buckling and shear deformation of longitudinal rebars are reduced