Static structures (e.g. – buildings) – Means compensating earth-transmitted force – Relative motion means between a structure and its foundation
Patent
1993-11-18
1995-08-08
Safavi, Michael
Static structures (e.g., buildings)
Means compensating earth-transmitted force
Relative motion means between a structure and its foundation
521671, E02D 2734, E04B 198
Patent
active
054388074
ABSTRACT:
A manufacture to protect a structure from destructive earthquakes, having a number of slip joints, each joint comprises a consumable-while-sliding vertical cylinder and is rigidly coupled to a supported structure; each joint is supported by a pedestal plate having a slightly sagged upper surface which consists of three surfaces gradually transforming one into another forming a central concave area, an intermediate convex area, and a boundary concave area. The force of gravity will keep a superstructure in its pre-earthquake location on the pedestal plate until the magnitude of the earth movement exceeds a certain threshold. When the intensity of earth shaking builds up, the foundation will slip aside under the superstructure, the consumable cylinder eventually will shift into the convex area of the pedestal plate surface and the system will activate its softening ability. As a result, a transfer and accumulation of earthquake energy in the superstructure will be significantly curbed. Any excessive travel of the slip joint will be buffered smoothly with the help of the concave profile of the ultimate restraint area.
REFERENCES:
patent: 1761659 (1930-06-01), Cummings
patent: 2359036 (1944-09-01), Harper
patent: 3347002 (1967-10-01), Penkuhn
patent: 4462955 (1984-07-01), Albin et al.
patent: 4644714 (1987-02-01), Zayas
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