Earthquakeproof support

Abstract

PURPOSE: To obtain an earthquakeproof support which possesses the superior durability for a long period and in which breakage and destruction are prevented beforehand by projecting the outer peripheral edge parts of the uppermost and lowermost hard plates by the length in 100-400% of the thickness of a rubber elastic plate layer from the outer peripheral edge part of other intermediate hard plates. CONSTITUTION: The outer peripheral edge parts of the uppermost and lowermost hard plates 11' and 11' are projected by a length (x) in 100-400% of the thickness (t) of a rubber elastic plate 1 layer from the outer peripheral edge part of the intermediate hard plates 11, 11,.... As for an earthquakeproof support, when a horizontal shear deformation is generated by the generation of an earthquake, the outer peripheral edge part of the intermediate hard plate 11 positioned directly above the lowermost hard plate 11' is positioned always inside from the outer peripheral edge part of the lowermost hard plate 11', and the stress with which the outer peripheral edge part of the intermediate hard plate 11 is pulled to thud lowest hard plate 11' side is suppressed. This is true also for the outer peripheral edge part of the intermediate hard plate 11 which is positioned directly under the uppermost hard plate 11', and the bending deformation of the outer peripheral edge part of the intermediate hard plate 11 is eliminated by the suppressing of the pulling force, and the earthquakeproof support is prevented from being broken and damaged, by suppressing the generation of the local strain in the vicinity of the outer peripheral edge part of the intermediate hard plate 11. COPYRIGHT: (C)1992,JPO&Japio

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