Traditional shock absorption products can only be controlled for one kind of earthquake situation. For example, friction dampers can generate and consume energy in small earthquakes, but cannot provide sufficient stiffness in large earthquakes; Ordinary BRB can enter the buckling energy dissipation stage during moderate or large earthquakes, but it is in the elastic stage during small earthquakes and cannot play an energy dissipation role. Two-level-yielding Buckling restrained brace (DBRB) has high energy consumption and good rigidity in small, medium and large earthquakes, which can better protect the safety of the structure.

For small earthquakes, the first-order damper yields to the working state of energy dissipation damping, and the second-order BRB part is in the elastic working stage; for medium earthquakes, the first-order damper continues to maintain the working state of energy dissipation and damping, and the second-order BRB yields to energy dissipation and damping. Working state: In the event of a major earthquake, the first-order damper can be designed to exit or continue to work, and the second-order BRB maintains the working state of energy dissipation damping to ensure that the main structure does not collapse.

Generally, the products of DBRB manufacturers are of metal type. This kind of product is deformed due to large deformation during an earthquake, and the metal damper will quit working because it needs to be replaced after the earthquake is damaged. The friction type DBRB independently developed by our company has the advantage that the designed friction damper components have large displacement, and can still maintain the energy dissipation and damping working state during a major earthquake, and there is still energy dissipation after the earthquake, and it can not be replaced if it is qualified.