Claims
- 1. An earthquake resistant multi-story building comprising at least one energy concentration story having an elasto-plastic force-displacement relationship with respect to horizontal force and displacement;
- the force-displacement relationship being substantially specified by a yield strength F.sub.y, a yield displacement .delta..sub.y, an ultimate strength F.sub.u, and an ultimate displacement .delta..sub.u ;
- the energy concentration story comprising:
- a) plastic deformation members coupled to a portion of the building above the energy concentration story so that the plastic deformation members exhibit a large resistance to displacement when the displacement of that portion of the building is small, but when displacement is large, the plastic deformation members enter the plastic range; and
- b) elastic deformation members having elastic deformability up to the ultimate displacement, the elastic deformation members being capable of supporting the weight of that portion of the building above the energy concentration story, and being coupled to that portion of the building; and
- the force-displacement relationship of the energy concentration story being characterized in that:
- (a) stiffness in elastic range (F.sub.y /d.sub.y) is substantially greater than the stiffness in the plastic range;
- (b) the ultimate strength F.sub.u is between 0.5 and 0.8 times the optimum strength;
- (c) the ultimate strength F.sub.u is not smaller than the yield strength F.sub.y ; and
- (d) the ultimate displacement is substantially at least eight times as large as the yield displacement;
- whereby the plastic deformation members of the energy concentration story are capable of entering into the plastic range while other stories are in the elastic range so as to absorb vibration energy by plastic deformation of said plastic deformation members and decrease deformations of other stories when a large external force is exerted on the building.
- 2. An earthquake resistance multi-story building according to claim 1 wherein the yield strength F.sub.y is between 20% and 60% of the optimum yield strength.
- 3. An earthquake resistant multi-story building according to claim 1 wherein the yield strength F.sub.y of the energy concentration story is greater than an expected maxim horizontal force against medium design earthquake.
- 4. An earthquake resistant multi-story building according to claim 1 wherein the energy concentration story is the first story.
- 5. An earthquake resistant multi-story building according to claim 1 which comprises a plurality of energy concentration stories.
- 6. An earthquake resistant multi-story building according to claim 5 wherein the energy concentration stories are the first story and the top story.
- 7. An earthquake resistant multi-story building according to claim 5 wherein all the stories of the building are energy concentration stories.
- 8. An earthquake resistant multi-story building according to claim 1 wherein the elastic deformation members are columns of the building for supporting gravitational loads, and the plastic deformation members are not supporting the gravitational loads.
- 9. An earthquake resistant multi-story building according to claim 1 wherein the plastic deformation members are connected to beams of the story and the beams are enlarged in depth in the vicinity of the connection with the plastic deformation members.
- 10. An earthquake resistant multi-story building according to claim 1 which is further provided with a restoring means which are not in contact with the column while horizontal deformation of the story is less than a predetermined value and comes in contact with the columns when the horizontal displacement exceeds the predetermined level whereby providing additional restoring force to the story sufficient to cancel p-.delta. effect.
- 11. An earthquake resistant multi-story building according to claim 1 wherein the energy concentration story has a multi-linear hysteretic force displacement relationship.
- 12. An earthquake resistant multi-story building according to claim 1 wherein the energy concentration story has a bi-linear hysteretic force-displacement relationship.
- 13. An earthquake resistant multi-story building comprising at least one energy concentration story comprising:
- (a) elastic deformation members having an elastic deformability up to an ultimate displacement;
- (b) plastic deformation members having a yield displacement substantially equal to a yield displacement of the energy concentration story, and a plastic deformability up to the ultimate displacement, and being coupled to that portion of the building above the concentration story, so that the plastic deformation members exhibit a large resistance to displacement when the displacement of that portion of the building is small, but when displacement is large, the plastic deformation members enter the plastic range;
- the energy concentration story having an elasto-plastic force-displacement relationship regarding horizontal force and displacement, the force-displacement relationship being substantially specified by a yield strength F.sub.y, a yield displacement .delta..sub.y, an ultimate strength F.sub.u, and an ultimate displacement .delta..sub.u ;
- the force-displacement relationship being characterized in that:
- (i) stiffness in elastic range (F.sub.y /d.sub.y) is substantially greater than the stiffness in the plastic range;
- (ii) the ultimate strength F.sub.u is between 0.5 and 0.8 times the optimum strength;
- iii) the ultimate strength F.sub.u is not smaller than the yield strength F.sub.y ; and
- (iv) the ultimate displacement is substantially at least eight times as large as the yield displacement;
- whereby 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 deformation of said plastic deformation members so as to decrease deformations of other stories when a large external force is exerted on the building.
Priority Claims (4)
Number |
Date |
Country |
Kind |
61-227781 |
Sep 1986 |
JPX |
|
61-231689 |
Sep 1986 |
JPX |
|
1-161873 |
Jun 1989 |
JPX |
|
1-161874 |
Jun 1989 |
JPX |
|
Parent Case Info
This is a continuation of application Ser. No. 07/543,126, filed on Aug. 6, 1990 now abandoned, which was a continuation-in-part of Ser. No. 07/376,922, filed Jul. 10, 1989 now abandoned which was a continuation of Ser. No. 07/101,663 filed Sep. 28, 1987 abandoned upon the filing hereof.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
3638377 |
Caspe |
Feb 1972 |
|
4991366 |
Teramuro et al. |
Feb 1991 |
|
Non-Patent Literature Citations (1)
Entry |
"Earthquake-Resistant Limit State Design for Buildings" by Hiroshi Akiyama (University of Tokyo Press) 1985 Architecture--Sep. 1983 pp. 74-76. |
Continuations (2)
|
Number |
Date |
Country |
Parent |
543126 |
Aug 1990 |
|
Parent |
101663 |
Sep 1987 |
|
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
376922 |
Jul 1989 |
|