2024 Volume 80 Issue 13 Article ID: 23-13159
The Japanese Handbook for Bridge bearings was revised in 2018, and the items on design hysteretic models and product property verification tests were changed. In the current edition of the Specifications for Highway Bridges and their Commentaries V, the nonlinear characteristics of seismic isolation rubber bearings are generally modeled as bilinear in the dynamic verification of seismic isolation bridges with rubber isolators. However, it has been confirmed that the force-displacement characteristics of actual products are dependent on the maximum experienced strain due to the Mullins effect and that hardening occurs when the shear strain increases. In this study, a design hysteretic model that takes into account the Mullins effect and hardening in seismic isolation rubber bearings was used to investigate the effect of this phenomenon on the seismic performance of bridges.
