基于相似理论的三跨桥梁磁流变隔振

Magneto-rheological vibration isolation for three-span bridge based on similarity theory

采用无量纲相似分析法,计算出基于磁流变支座的三跨桥梁与小尺度试验台架的动力学关系,并以该关系为基础来指导试验台架模型的设计。运用Matlab分别对两系统进行动力学理论计算,仿真与试验结果表明:桥梁原型与模拟模型的加速度、位移等具有较好的相似性。进一步根据模型参数,搭建小尺度试验台架,试验结果与理论值基本吻合,桥面振动加速度峰值最大减小42%,位移峰值最大减小36%。表明采用相似理论进行模型试验研究能够揭示出桥梁可控隔振原型的主要隔振性能。

The dimensionless similarity analysis method is adopted to calculate the dynamic similarity relationship between a three-span bridge and a small-scale test bench based on Magneto-rheological Bearing（MRB）.On the basis of the relationship,the test bench model s designed.Dynamics of the two systems are calculated by Matlab respectively.Simulation results show that the acceleration,displacement of the prototype and similar models have good similarity.Further,according to the model parameters,a small-scale test bench is built,and the experimental results are in good agreement with the theoretical results.The acceleration peak and displacement peak of the bridge deck can be reduced by 42% and 36%,respectively.Therefore,the model experimental study based on similarity theory can reveal the vibration isolation performance of the controllable prototype.