Effect of an Innovative Friction Damper on Seismic Responses of a Continuous Girder Bridge under Near-Fault Excitations

Continuous girder bridges have been extensively constructed in China over the past 30 years, and these tend to experience severe damage under ground motions with velocity pulses. In current research, an innovative linear friction damper (LFD) is proposed mitigate seismic damages of continuous subjected near-fault motions. The OpenSees platform adopted establish numerical model a bridge region. Sixteen pulses are selected from PEER motion database. wavelet method used extract maximum pulse two orthogonal components motion. effects initial gap, coefficient friction, spring stiffness LFD on responses investigated by response surface (RSM). for original system (Non-isolated), (Isolated-LFD), lead rubber bearing (LRB) (Isolated-LRB), such as force–displacement relationship, displacement, pier curvature, obtained after conducting series nonlinear time history analyses. results reveal that this device can effectively control relative displacements between superstructure substructure bridge. Meanwhile, piers be significantly decreased compared non-isolated system.