It was shown that the seismic response of bridges could be decreased by using metallic dampers,and the distribution of inner force in the bottom of bridge piers was made uniform.

Theoretical and Experimental Research on the Structure with New Type of Metallic Dampers;

Based on the constitutive relation of MR fluids,a model is proposed to compute the damping torque of rotary MR dampers.

Firstly, the relationship and its asymptote between force and displacement of the steel plate damper are deduced under monotonic loading.

Secondly, damping force hysteresis loop models for mild steel plate damper are deduced under considering the R-O constitutive model.

Simulation analysis on hysteretic behavior and vibration suppression of the mild steel damper with the diamond-shaped opening and added damping and stiffness;

Study on mechanical behavior and effectiveness of a new type of mild steel damper;

An experimental research on performance and application of a new type of mild steel damper added damping and stiffness(ADAS);

Earhquake-resistent design of reinforced concrete frame with metallic dampers of "dual functions";

A new idea of designing mild metallic damper is presented,it is that to strengthen the initial stiffness by extending the steel plate of the damper in its own plane and to increase the energy-dissipating ability by changing the geometric shape of the steel plate of the damper.

A three-dimensional five story frame structure model with and without metallic damper are made with ADPL language in ANSYS program.