Large-span Prestressed Concrete Railway Continuous Beam Bridge Seismic Response And Mitigation And Isolation Studies,

The present paper gives a study on mechanical models of lead-rubber bearing (LRB) and seismic isolation effects by using LRB as isolation unit as well as how to choose it in real construction. Based on the analysis of ChenCun channel extra-long railway continuous beam bridge (70m+ 125m+70m) , the various effects on three-span continuous beam bridge by using LRB has been studied. Meanwhile, bearing parameters has been optimized by applying methods of orthogonal design and of efficacy coefficient. The main contents of this paper are presented as follows:1.On the basis of LRB's actual stressed characteristics, the advantages and disadvantages of several frequently used models has been compared. Meanwhile, this paper present a simulation of bilinear force-deformation relation of LRB by non-linear spring element through finite element software MIDAS.2.On the study of ChenCun continuous beam bridge, the isolated effect by various factors has been studied, such factors as arrangement of bearings, the stiffness of beam and pier, parameters of isolated bearings (Ku, Fy andη) , soil-structure interaction, seismic waves, site conditions and train live load.3.On the basis of lead-diameter, rubber-diameter and shear modulus of rubber as variables, bearing parameters has been optimized by applying methods of orthogonal design and of efficacy coefficient. Meanwhile, this paper gives an effectual and practical method for bearing optimization.4. The impact of isolation in foundation design has been discussed in this paper.