Mitsubishi Hitachi Power Systems, Ltd.

Keiichi Moritsuka

Motoki Kato

Yuji Kuroda

Kunihiro Morishita

Masaki Shimono

Tatsuya Amano

A structure for seismic isolationprovided on a structure planeincluding a pair of left and right columnsspaced apart in a horizontal direction, and a pair of upper and lower beamsA,B spaced apart in a vertical direction, wherein the structure for seismic isolation comprises: a seismic isolation deviceprovided in a middle of each of the columnto be displaced toward the beamA; and a horizontal rigid bearing element that is provided between an area in which the seismic isolation deviceis provided and the beamB and that includes a connection beamconnecting the pair of columnsand vertical bracesL,R.

Structure for seismic isolation, steel support structure, and method for seismic isolation of existing steel support structures

In a boiler support structure in which certain seismic isolators are provided with a pullout countermeasure, the seismic isolators to be provided with the pullout countermeasure are individually identified according to whether the seismic isolator satisfies Formula (1): N+N&#x3e;N. . . Formula (1), where N(N&#x3c;0) is a compressive load occurring on each of the seismic isolators and calculated on the basis of a permanent load imposed on the boiler support structure; N(N&#x3e;0) is a pullout force occurring on each of the seismic isolators and calculated on the assumption that an earthquake has occurred; and N(N&#x3e;0) is an allowable pullout force of each of the seismic isolators and calculated using an allowable pullout stress of each of the seismic isolators.

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Yokohama, Japan

Keiichi Moritsuka