Lead Isolation Rubber Bearing Continuous Beam Bridge Seismic Response Preliminary Analysis

The bridge anti-seismic research in China has achieved substantial improvements in technology and gathered great expierence during the past30years. Many advanced design ideas have been continued board-level endorsement, but they have rarely been used in practical engineering design. Most bridge still designed according to the "Specifications of Earthquake Resistant Design for Highway Engineering(JTJ-004-89) issued on January1,1990, which influenced the development of the bridge construction of China. With the issue of "the detailed regulations of Guidelines for Seismic Design of Highway Bridges"(JTG/T B02-01-2008) on October1,2008, absorbing the principle design of seismic isolation and reduction and the relavent rules.and the new anti-seismic ideas and design procedures started to spread.Design of seismic isolation and reduction is a method of setting a seismic isolation and reduction system between the top and the bottom of the bridge, enlarging the damping of the structure system to decrease the energy dilivered to the upper part of the bridge, reducing the earthquake response of the structure. As a effective isolation device, the Lead-Rubber-Bearing (LRB) has gradually been used in bridge construction. Continuous beam is the commonly used stucture in upper part design of viaduct in China. Consequently, based on previous research achievements, the furthe research on the design of seismic isolation and reduction of bridge with Lead-Rubber-Bearing and continuous beam is necessary.With the aid of the finite element software SAP2000, the paper is to analyse the lateral and longitudinal seismic isolation and reduction of continuous beam viaduct by simulating the foundation, pier column, support, upper continuous beams of the viaduct, building three dimensional models, using response spectrum and nonlinear dynamic time history analysis to offer valuable references.