Experiment on Verification of Measuring System of Experimental System for Full-Size Seismic Isolator

“E-Isolation” has developed and adopted a new system that can directly measure the reaction force of the devices, excluding of the friction force generated in the bearing under the moving platen and the inertial force due to the weight of the moving platen. In this paper, three tests were conducted to verify the accuracy of the measurement system in “E-Isolation”: (1) a verification test of the horizontal stiffness of the reaction beam supported by laminated rubber bearings, (2) a static test that horizontal load of 1000 kN was applied to the reaction beam and the moving platen, and (3) a performance test using a natural rubber bearing with a diameter of ∅1200. Test (1) showed that the horizontal stiffness of the reaction beam system can be accurately evaluated based on structural performances of the supporting bearings, and that the maximum horizontal load acting on the reaction beam support is extremely small. From the results of (2) and (3), the system demonstrated a possibility to directly measure the reaction force of the specimen without effects of friction and inertial forces. In addition, it has been confirmed that the reaction measurement links and the rotation constrain links bear the horizontal loads in the ratio of 3:1, as assumed in design at the horizontal load.