Abstract
In Menshin design it is recommended not to elongate the natural period so that the deck response displacement does not become excessively large. Under such a design requirement, not only an isolator but also a column undergoes inelastic range when the bridge is subjected to a strong ground shaking. This results in the plastic hinge at both the isolator and the column. Since nonlinear interaction between an isolator and a column has not been studied, a cyclic loading test was conducted. It was found from the experiment that inelastic response of the column increases when the nonlinear restoring force of isolator reaches the yielding force of the column, and that the energy dissipation occurs more in the column than the isolator.
