Abstract
This paper proposes a macroscopic mechanical model for simulating large-deformation behaviors of laminated rubber bearings. The model is expanded by adding an axial spring to an existing model composed of shear and rotational springs and a rigid element. The existing model can express some characteristics shown at large deformations such as instability and height drop. The existing model, however, overestimates height drop at large deformations and shows infinite vertical stiffness at very low lateral deflections. To solve these problems the proposed model has been devised. The axial spring newly added is modeled so that elongation at the center of section of a bearing induced by bending momen is taken into account. This paper gives the formulation of the model and compares analyses with tests, in which rubber bearings were laterally loaded under changing vertical load. From these tests and analyses, it is found that the proposed model well expresses characteristic large-deformation behaviors of laminated rubber bearings and improves the accuracy in height drop.
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