Anti-seismic bearing
AssigneeBridgestone Construction
InventorsYoshihide Fukahori, Hiromu Kojima, Akihiko Ogino
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Abstract
An anti-seismic bearing which comprises a plurality of rigid plates and viscoelastic flexible plates laminated alternately, with at least one of the flexible plates being made of a vulcanizate of a high-loss rubber compound composed of 100 parts by weight of rubber and 3 to 40 parts by weight of phenolic resin having a softening point or melting point of 150.degree. C. or below, the vulcanizate having the properties specified below. (i) The hysteresis ratio at 100% tensile deformation at 25.degree. C. is 0.2 to 0.7. (ii) the ratio E.sub.(-10) /E.sub.(30) is 1.0 to 2.5, where E.sub.(-10) is a storage modulus at -10.degree. C. and E.sub.(30) is a storage modulus at 30.degree. C., both dynamically measured at 5 Hz and 0.01% strain.
Claims15
An anti-seismic bearing comprising a plurality of rigid plates and viscoelastic flexible plates laminated alternately, with at least one of said flexible plates being made of a vulcanizate of a high-loss rubber compound composed of 100 parts by weight of rubber and 3 to 40 parts by weight of phenolic resin having a softening point or melting point of 150.degree. C. or below, said vulcanizate having the properties specified below;
- (i) the hysteresis ratio at 100% tensile deformation at 25.degree. C. is 0.2 to 0.7;
- (ii) the ratio E.sub.(-10) /E.sub.(30) is 1.0 to 2.5, where E.sub.(-10) is a storage modulus at -10.degree. C. and E.sub.(30) is a storage modulus at 30.degree. C., both dynamically measured at 5 Hz and 0.01% strain;
- said high-loss rubber compound containing a tackifier defined in (iii) and/or (iv) below;
- (iii) petroleum hydrocarbon resin in an amount of 2 to 40 parts by weight for 100 parts by weight of rubber,
- (iv) rosin or rosin derivative in an amount of 2 to 20 parts by weight for 100 parts by weight of rubber.
Dependencies are inferred from the claim text.