Buckling restrained brace is a kind of buckling restrained seismic member, which overcomes the shortcomings of compression buckling of ordinary brace, and has the characteristic that buckling will not occur under tension and compression. The center of the buckling restraint support is a core plate, which is different from the ordinary support in that it is equipped with a casing outside. The general casing is a steel casing, and the core plate is placed in the steel casing. Between the steel casing and the core plate, there is a filler material, usually concrete or mortar. In order to reduce the force transmitted to the filling material when the core plate is subjected to axial force and the expansion under pressure, a certain gap is usually left between the core plate and the filling material or a layer of unbonded material is added. The load borne by the buckling restraint support is all borne by the core plate, and the steel sleeve and filler materials only constrain the compression buckling of the core plate, so that the support can yield under both tension and compression. Buckling restrained braces have the characteristics of high bearing capacity, good ductility and hysteretic performance, and are easy to be arranged in reinforcement projects.

The working principle of bridge viscous damper is similar to a device of hydraulic equipment. It consists of a piston head with small holes, a cylinder, a viscous damping liquid and a piston rod. Whenever our bridge is greatly impacted by the violent earthquake force, the superstructure of the bridge transmits the force generated by the earthquake to the damper, and the piston is pushed under the earthquake force. At the same time, the sliding of the piston rod causes the pressure difference of viscous damping liquid on both sides of the oil cylinder device. The damping force generated by the liquid is through the piston head with small holes, which will dissipate the structural energy and vibrate through the heavy dissipation of viscous energy, This will reduce the impact of the structure on the seismic response.

Buckling restrained brace damper is a kind of buckling restrained seismic member, which overcomes the shortcomings of compression buckling of ordinary brace, and has the characteristic of no buckling under tension and compression. The center of the buckling restraint support is a core plate, which is different from the ordinary support in that it is equipped with a casing outside. The general casing is a steel casing, and the core plate is placed in the steel casing. Between the steel casing and the core plate, there is a filler material, usually concrete or mortar. In order to reduce the force transmitted to the filling material when the core plate is subjected to axial force and the expansion under pressure, a certain gap is usually left between the core plate and the filling material or a layer of unbonded material is added. The load borne by the buckling restraint support is all borne by the core plate, and the steel sleeve and filler materials only constrain the compression buckling of the core plate, so that the support can yield under both tension and compression. The seismic dampers with buckling restrained braces in buildings have the characteristics of high bearing capacity, good ductility and hysteretic performance, and are easy to be arranged in reinforcement projects.