Composite disc axial dampener for buildings and structures
A seismic axial dampener device is constructed of a multitude of composite or metallic conical compression discs and an exo-structure capable of dampening both tension and compression cycles of a building structure due to a seismic, explosion, or wind event. The dampener reacts and dampens the loading in both tension and compression along the axis of the cross brace in linear-elastic bending, creating internal hoop stress, and not through shear of the dampener device.
1. A dampening device comprising:
a shaft having an axis, a first end plate, a center plate, and a second end plate;
an outer housing;
a first plurality of discs disposed coaxially to form a first disc stack disposed along the shaft between the first end plate and the center plate, the first disc stack being concentric to the axis an in contact with the first end plate and the center plate,
a second plurality of discs disposed coaxially to form a second disc stack disposed along the shaft between the center plate and the second end plate, the second disc stack being concentric to the axis, disposed within the outer housing, and in contact with the center plate and the second end plate, wherein:
the first plurality of discs and the second plurality of discs each comprising fibers within a polymer resin matrix, the fibers comprising carbon, aramid, or glass, and
each disc of the first plurality of discs and the second plurality of discs having a concave surface and an opposing convex surface,
the first plurality of discs and the second plurality of discs are disposed in pairs such that the convex surfaces of alternating pairs are oriented in substantially opposed directions, and
the brace is adapted to dampen loading in both tension and compression along the single central axis in linear-elastic bending, and not through shear of the discs.
2. The device of claim 1 , wherein:
the second end plate adapted to move coaxially with the disc stack relative to the center plate.
3. The device of claim 2 , wherein the first end plate and the second end plate are coaxially connected.
4. The device of claim 2 , further comprising:
a first end connection disposed on the first end plate and adapted to connect to a first structural member of a building;
a second end connection disposed on an end of the device opposite the first end connection and adapted to connect to a second structural member of a building.
5. The device of claim 4 , wherein the second end connection is disposed on the outer housing.
6. The device of claim 1 , wherein the plurality of discs are substantially conical.
7. The device of claim 1 , wherein, in an unloaded configuration, the first disc stack has a first height and the second disc stack has a second height and, in tension, the first height is increased and the second height is decreased.
8. The device of claim 7 , wherein, in compression, the first height is decreased and the second height is increased.
9. The device of claim 1 , wherein the first disc stack is unenclosed and the second disc stack is disposed entirely within the outer housing.
10. The device of claim 1 , wherein the outer housing comprises a low friction polymer disposed on an inner surface, the inner surface being in contact with the second end plate.