ABSTRACT
To solve the problems of degradation of mechanical properties and high toxicity of lead rubber bearings under earthquakes, this paper proposes a new type of composite damping core rubber bearing (CRB) composed of iron powder and polyurethane according to a certain ratio. At the same time, the shear performance tests under different shear strains, compressive stress, loading frequency, and cyclic loading conditions are carried out for the new rubber bearing with composite damping core to explore the impact on the mechanical properties of CRB. The results show that the shear strain has a great influence on the horizontal equivalent stiffness and yield strength of CRB; the increase of compressive stress can improve the energy dissipation capacity of CRB; the loading frequency has little effect on the mechanical properties of CRB; and the mechanical properties of CRB change little after cyclic loading.
