Abstract:

Based on the conventional lead-rubber bearing models, a new beating model considering the axial effect is presented, which makes it possible to transfer the uniaxial model to the biaxial one. Then, through the response analysis of the proposed model under the triaxial harmonic loading condition, the mechanical performances of the lead-rubber bearing affected by the axial effect are discussed. The results indicate that there is significant difference in the resilience-displacement curves between the biaxial model and the uniaxial one; and that the yield force decreases with the increase of the shear strain under a constant axial load, while it increases with the axial load at a constant shear strain.

Key words: axial effect, lead-rubber bearing, base-isolated structure, triaxial harmonic load