| 摘要 |
PROBLEM TO BE SOLVED: To enhance cold resistance by performing large damping effects at the time of inputting great amplitude oscillation, and restraining a spring constant from lowering to a low temperature. SOLUTION: The base isolation structure is of the type including a structure in which a plurality of rigid plates and rubber elastic plates are stacked alternately, wherein; (1) an equivalent damping constant being 0.10<=e(50%)0.25 at 20 deg.C, a frequency of 0.5Hz, and a sharing deformation displacement amplitude of±50%, and an equivalent damping constant being 0.12<=he(200%)<=0.50 at 20 deg.C, a frequency of 0.5Hz, and a shearing deformation displacement amplitude of±200%, and the ratio of an equivalent damping constant being 1.1<=he(200%)he(50%)<=2.5 relative to an equivalent damping constant±50%, and (2) the ratio of an equivalent rigidity of KK 20 at 20 deg.C, a frequency of 0.5Hz, and a shearing deformation displacement amplitude of 150% to an equivalent rigidity of KK-10 at -10 deg.C, a frequency of 0.5Hz, and a shearing deformation displacement of±50% being 1.0<=KK-10/KK20<=3.0, thus blended rubber for composing rubber elastic plates is determined to satisfy conditions of formulas of (1) and (2).
|
