Static structures (e.g. – buildings) – Means compensating earth-transmitted force – Relative motion means between a structure and its foundation
Patent
1992-08-13
1993-12-21
Friedman, Carl D.
Static structures (e.g., buildings)
Means compensating earth-transmitted force
Relative motion means between a structure and its foundation
E04H 902
Patent
active
052711978
ABSTRACT:
The present invention provides an earthquake resistant multi-story building which is characterized by having an energy concentration story. The energy concentration story has an elasto-plastic force-displacement relationship regarding horizontal force and displacement. The force-displacement relationship is characterized in that: (a) stiffness in elastic range (F.sub.y /d.sub.y) is generally equal to an optimal stiffness of the same story according to an elastic design concept; (b) the yield strength F.sub.y is generally less than 80% of an optimum yield strength; (c) stiffness in plastic range is positive and generally less than about a half of the stiffness in the elastic range; and (d) ultimate displacement is generally at least twice as large as the yield displacement. The energy concentration story is capable of entering into the plastic range while other stories are in the elastic range, and absorbing vibration energy by plastic deformations thereof so as to decrease deformations of other stories when a large external force is exerted to the building.
REFERENCES:
patent: 3638377 (1972-02-01), Caspe
patent: 4991366 (1991-02-01), Teramuro et al.
"Earthquake-Resistant Limit State Design for Buildings" by Hiroshi Akiyama (University of Tokyo Press) 1985 Architecture--Sep. 1983 pp. 74-76.
Hirama Toshihiko
Ikura Kiyoshi
Kanemitsu Tomomi
Kato Masahiro
Mase Shinji
Friedman Carl D.
Shimizu Construction Co. Ltd.
Smith Creighton
Sumitomo Metal Industries Ltd.
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