Experimental Study And Numerical Simulation On Damping Performance Of Mild Steel Ring Damper

With the continuous development of China’s economy,there are higher requirements for the seismic capacity of structures.It is increasingly important to improve the seismic capacity of existing line bridge structures quickly and effectively.The technology of damping and isolation is becoming mature.Mild steel damper is used as one of the common damping and isolation devices because of its full hysteresis and stable energy dissipation.In this paper,the mechanical properties and damping effect of a new mild steel ring damper are analyzed by means of experimental study and numerical simulation.The main research contents are as follows:1.The development of seismic theory of Bridges and the application of mild steel damper are analyzed,the working principle of mild steel damper is introduced,and the necessity of studying the mild steel ring damper is established.2.The performance test of the mild steel ring damper is carried out to obtain the failure phenomenon,hysteresis curve,skeleton curve and low cycle fatigue performance of the specimen,and the ductility coefficient,equivalent damping ratio and other parameters are calculated.3.The dampers are numerically simulated and compared with the test results,including the comparison of relevant mechanical properties parameters,to verify the mechanical properties of the dampers.4.The seismic response of the beam bridge equipped with the mild steel ring damper is analyzed,and the influence of the damper on the seismic response of the beam bridge is studied.The seismic response of a continuous girder bridge was analyzed according to whether the mild steel ring damper was added or not,and the results showed that:for the three selected seismic waves,the pier bottom shear,the pier bottom bending moment and the pier top displacement of the fixed pier all decreased in different degrees,regardless of the direction of the bridge or the direction of the bridge.The mild steel ring damper can reduce the seismic response of the fixed piers of the continuous girder bridge and improve the seismic performance of the whole continuous girder bridge.