Optimization Study on the Design Parameters of Seismic Isolated Bearing for Railway Bridges

Abstract eng:
A parameter optimization model of seismic isolated bridge system considering soil-structure interaction and running safety is established. Mechanical parameters of the isolation bearing are taken as design variables, and the maximum moments at the bottom of bridge piers are employed as objective functions when the displacement between pier top and beam meets with the limited values. Through calculation analysis, the influence rules of dynamic parameters of the lead-rubber bearing on the seismic responses are given, which the ratio of the stiffness after yielding to the stiffness before yielding has important effect on the structural seismic responses in the seismic isolation design for simple supported beam bridge. Therefore, the design requirements for seismic responses of bridges can be satisfied by the simplified method of changing the stiffness ratio of isolated bearings. In order to enhance the optimal efficiency, the running safety can be considered out of the optimal process. The values of spectral intensity for the seismic input to the running vehicles can be checked after the determination of the optimal bearing parameters. Through the optimal analysis of isolated bridge system, the optimal design parameters of isolation bearing can be determined properly, and the seismic forces can be reduced maximally as meeting with the limits of relative displacement between pier top and beam, which provides efficient paths and beneficial references for dynamic optimization design of seismic isolated bridges.

• Export as: BibTeX | MARC | MARCXML | DC | EndNote | NLM | RefWorks
• Add to your basket