Abstract：A mechanical model of displacement dependent friction damper was improved by considering the contribution of slope reaction to output force generated by the damper. Then, taking a five-storey base isolated structure as an example, the influence of the damper on seismic-resistant behavior of base isolated structure with lead rubber bearings was evaluated. Numerical analysis showed that the friction damper could effectively reduce the displacement of isolation floor while increase the base shear force and the top floor acceleration of main structure under normal seismic excitation. When the building subjected to the near-fault pulse-type earthquake, the displacement of isolation floor was significantly reduced and to some extend the seismic response of the main structure was also suppressed. In addition, the influence of three main parameters determining mechanical property of the displacement depended friction damper, that is, initial displacement and stiffness of spring as well as slope angle, on seismic response of the isolated structure was also investigated.
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