THE HORIZONTAL DEFORMATION CHARACTERISTICS OFNATURAL RUBBER BEARING BY FEM ANALYSIS

摘要

In this study, the influence of flange rotation to horizontal deformation characteristics of laminating rubberrnbearing is investigated through FEM analysis. Analysis variables are shape of rubber bearings and rotationrnangle of upper flange. Analysis results present that horizontal stiffness decreases until shear strain ( γ) ofrn200% in case of bearings with rotation. This tendency becomes larger as rotation angle becomes bigger.rnThe decrement of horizontal stiffness in rotation angle (R) of 1/50 is remarkable. However, the influencernof rotation can not be observed after shear strain of 200%. It is concluded that the structural design in midstoryrnisolation system is possible by estimate rotation angle of rubber bearings of R<1/150 and 10%rnreduction of horizontal stiffness.