| As a lifeline project, how to effectively reduce the damage of the earthquake on the pier- beam structure in a bridge has been a hot issue for scholars at home and abroad. Because of the stiffness and damping of the traditional bearing is not controllable, the buffering capacity is limited, and this kind of bearing can not guarantee the safety of the structure under earthquake.In this paper,based on magnetorheological materials as the composition of magneto- rheological bearing(MRB) for the analysis of a typical three span continuous bridge dynamic response under horizontal seismic action, a semi active control algorithm for the vibration control in the bridges which magneto-rheological bearing is used had been achieved.These analyses can make certain theoretical reference for the design and optimization of the bearing. The main contributions and works are as follows:(1) The principle and application of vibration control technology had been reviewed,the magneto-rheological bearing on independent research and development had been introduced,in additon, all kinds of vibration control algorithm had been discussed.(2)The space analysis model of whole bridge had been established by ABAQUS, The actual bridge and similar model bridges which deduced by analogous theory had been analyzed by time history analysis method.The damping and stiffness changes under the seismic response characteristics had been explored and the isolation bridges had been compared to them.(3)A semi active control algorithm for the vibration control in the bridges based on simple bang-bang control algorithm had been achieved by MATLAB and the programs to calculate the seismic response of the structure had been compiled to investigate the damping effect of magneto-rheological bearing.The analysis results show that the damping capacity of magneto-rheological is splendid and verified the rationality of this semi active control algorithms, and provides a theoretical basis for further research. |
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