This technology is a plate-structured damper that uses a double-sided friction action plate inserted into a cover plate's cavity to provide primary damping through friction. Secondary elastic resistance is provided by an elastic plate inside the action plate's hollow space and elastic springs between the cavity's inner end and the action plate. Fasteners passing through the cover and elastic plates adjust friction and guide relative movement.
Conventional self-centering dampers for earthquakes and typhoons, which use shape-memory steel rods to connect friction plates, are difficult to adjust for restoring force after production. Because they convert vibration energy into frictional heat, they often fail to fully return to their original state. Furthermore, damaged rods are hard to replace or repair, making reuse difficult, and exposed operating parts pose safety risks.
This technology uses pre-compressed polyurethane cylinders as elastic springs to increase resistance. By providing clearance between the polyurethane elastic plate and the hollow space, resistance can be adjusted by changing the size, placement, and thickness of the plates. The cover plate consists of a pair of support plates and a connector; pressure bolts, nuts, and washers passing through slots in the support plates regulate friction, while complementary surface textures and spring pins prevent detachment and guide movement. Applicable to seismic retrofitting for schools and hospitals, bridge bearings, and plant piping, this damper returns to its original position after major earthquakes without residual deformation and allows for on-site damping performance adjustment via bolt tightening.
This invention was developed with support from the Ministry of Land, Infrastructure and Transport for the commercialization of multi-functional seismic vibration reduction devices for pilotis structures capable of withstanding a magnitude 7.0 earthquake.
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