| 摘要 |
PURPOSE: To provide a base isolation structural body for light load suitable for a detached house or the like by bonding a plurality of hard plates having rigidity and soft plates having viscoelastic property alternately to each other to constitute a compound lamination body, and forming an inner part of the soft plate of a material of higher damping performance in comparison to an outer part. CONSTITUTION: A plurality of hard plates 1 having rigidity and soft plates 2 of rubber or the like having viscoelastic property are alternately bonded to each other to constitute a compound lamination body, and an inner part 2a of the soft plate 2 is formed of a material of higher damping performance in comparison to an outer part 2b. Accordingly, a base isolation structural body can be provided, having low spring rigidity and capable of exhibiting high damping performance, while sharing the spring rigidity to the outer part 2b and damping performance to the inner part 2a. Rubber used for the outer part 2b is desirable having excellent creeping performance even when having low damping performance, and it is also desirable that tanδof the inner part 2a is not less than 0.3 and the 50% tensile modulus of the outer part 2b is 1.0-6.0kgf/cm<2> .
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