Experimental Study On Mechanical Properties Of Rubber Materials Used For Isolation Bearings

Because of its good seismic performance,low cost and convenient installation and replacement,isolation bearings become the most widely used seismic isolation measures.At present,one of the most widely used seismic isolation devices is laminated rubber bearings.The current research on laminated bearings has been focused on the macro level,mainly concentrated in the study of mechanical properties of the bearing,bearing in engineering,failure of support and protection measures,rarely on the support structure component of the stress analysis and deformation.This analysis is helpful to the analysis of the formation,change and yield failure mechanism of the bearing stiffness.This paper attempts to systematically study the mechanical properties of the components,including the following:(1)we analyzed the Mooney theory,Mooney-Rivlin theory,Ogden theory,Valanis-Landel theory and its characteristics.In this paper,the fitting formula of each strain is deduced.(2)a set of non contact deformation and force measurement system is designed,and the deformation and force of the whole process are recorded synchronously on a platform.Two kinds of specimens with different hardness were made,and the uniaxial tensile test and plane tensile test were carried out.(3)using the fitting function of the finite element software ABAQUS,the suitable strain energy function of the rubber material is selected.(4)the finite element model of the common laminated rubber bearing is established.The distribution of the stress and deformation of the inner rubber layer and the steel plate along the radial direction of the bearing is analyzed.The influence of the hardness and the shape factor of the support on the distribution is discussed.