seismic response of bearing with yielding shear plate installed on the steel moment frame

Seismic-base-isolation of buildings and bridges is one of the most commonly adopted methods in controllingstructures against severe earthquakes. base isolation is usually divided into two groups of rubber bearing and friction pendulum bearing. the record of seismic-base-isolation is provided by (warn and ryan, 2012). rubber bearing consists of: natural rubber bearings (nrbs) (iizuka, 2000; sanchez et al., 2012) lead rubber bearing (lrb) (ghobarah and ali, 1990; ryan et al., 2005) and high-damping rubber [hdr] bearing (bhuiyan et al., 2009). a method considered inseismic-base-isolation design is the transition of fundamental natural period of a structure into a greater period. in this method, the behavior of the superstructure is mostly of linear nature.