SHAKING TABLE TEST AND ANALYSIS ON BASE ISOLATED FBR PLANT MODEL WITH HIGH-DAMPING RUBBER BEARING

摘要

As for the high damping laminated rubber bearing(HRB) which was nominated as one of three base isolation devices to be applicable for the demonstration FBR plant(DFBR) in Japan, the shaking table tests to verify the seismic safety for the design earthquake(S2-M) with the 5% damping response velocity spectrum to be uniform 200kine(Vmax) in long periods from 2 seconds to 10 seconds and simulation analyses were conducted. The test parameters were the isolated natural period-2.0 / 2.83 seconds, and the phase properties of earthquake ground motion. The difference was the axial stress value, that is to say, the number of isolation devices for 2.83 seconds was half for 2.0 seconds. Regarding the test results, the responses for 2.0 seconds were kept within the linear domain, but ones for 2.83 seconds exceeded the linear domain because of the insufficient damping capacity. The simulation analyses for both cases were conducted, but the test results for 2.83 seconds were placed to ones of the half intensity input(100kine) of design earthquake(S2-M), which were within the linear domain. The test results were simulated by the non-linear seismic response analysis, as usual, using the simple bilinear model for HRB. Moreover, the modified bilinear model for HRB, in which the shear strain and frequency dependency were considered, gave closer results.