In this study, the influence of flange rotation to horizontal deformation characteristics of laminating rubber bearing is investigated through FEM analysis. Analysis variables are shape of rubber bearings and rotation angle of upper flange. Analysis results present that horizontal stiffness decreases until shear strain ( γ) of 200% in case of bearings with rotation. This tendency becomes larger as rotation angle becomes bigger. The decrement of horizontal stiffness in rotation angle (R) of 1/50 is remarkable. However, the influence of rotation can not be observed after shear strain of 200%. It is concluded that the structural design in midstory isolation system is possible by estimate rotation angle of rubber bearings of R<1/150 and 10% reduction of horizontal stiffness.
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