Isolation Bearing Of Bridge Based On Finite Element Analysis

In the field of the base isolated, lead rubber bearing is vibration isolator and damper both rolled into one,which has good isolation properties. In comparison with the other isolation bearing, lead rubber bearing ,drawing materials conveniently,simply relatively made and cost economical, became a object of many isolation deliberating.In this paper,established a special isolation Bearing unit about lead rubber bearing in numerical analysis,which utilized the method of the simplification analysis, constructed isolation bearing unit in overall properties, simulated its stiffness and damping to avoiding enormous amount of calculation because of scattering bearing directly.In order to show the validity of the unit,different lead rubber isolators are introduced for the numerical analysis,good agreement between the analytical results and the experimental results is obtained.Making use of unit stiffness matrix of the lead rubber bearing, obtained nine material constants of the orthotropic material unit by using back analysis. In the course of the whole bridge researches, used a orthotropic unit instead of lead rubber bearing. On this basis, did a comparative analysis at two bridges with different bearing, between the two models, the error of maximum deformation value is minor,which gave an account of effective of the computational methods effective.Application the LRB in practical bridge,based on the model and considering multi-parameter effect,a large quantity of calculation and theoretical analysis are carried out to obtain the laws of the response of isolated bridge.During the anaiysis,different factors,such as seismic site,intensity,link stiffness of LRB, and bridge structures themselves are considered.