| This report consists of two main parts: an experimental study of seismic isolation systems with emphasis on secondary system response, and verification of the accuracy of dynamic response-history analysis programs. Tests were performed on a single bearing test machine to determine isolation system properties for analytical modeling. Earthquake simulator tests were performed on a quarter-scale, six story, building model. A total of eight different isolation systems were studied, namely, low damping elastomeric bearings with and without linear and nonlinear viscous dampers, Friction Pendulum (FP) bearings with and without linear and nonlinear viscous dampers, low damping elastomeric bearings with lead cores, and low damping elastomeric bearings in conjunction with flat sliding bearings. Each configuration was modeled in two dynamic analysis computer programs: SAP2000 and 3D-BASIS-ME. |
