THE SEISMIC RESPONSE FEATURES OF ISOLATED BRIDGE WITH LBR

In this paper, nonlinear time history analysis of isolated bridges is conducted with the use of large numbers of seismic waves which have same response spectrum and similar envelop in time-domain. It is found that the responses of isolated bridges with lead-rubber bearings differ from each other to a large extent. The maximum response is sensitive to the total process of seismic ground motion. The lead-rubber bearings are a very efficient energy dissipation system. The initial yielding force of lead-rubber bearings has an important influence on isolation effectiveness.