Longitudinal girder displacement analysis and optimal control method for suspension bridges under random traffic flow
To control longitudinal girder displacement of suspension bridges,a displacement optimal control method was proposed by combining viscous dampers with bearings.Firstly,the components of monitored dis-placement data were analyzed by the empirical wavelet transform(EWT)method.Then,a dynamic model of a suspension bridge was developed and verified by the monitored data.Finally,the effects of viscous dampers and bearings on the longitudinal girder displacement of the suspension bridge were analyzed.The response sur-face method(RSM)was utilized to optimize the combination parameters.The results show that the dynamic components caused by vehicles account for 94.5％of the cumulative value of the longitudinal girder displace-ment.The viscous dampers and the horizontal forces of the bearings have different influence ranges.Larger damping coefficients or smaller damping exponents contribute to smaller cumulative values.The bearing horizon-tal force has a limited influence range.Optimizing the combination parameters of the viscous dampers and bear-ings can reduce the cumulative displacement by 38％and improve the service life of girder constraint devices.
suspension bridgelongitudinal displacementfinite element modeldisplacement controlvis-cous damperbearing
万方数据
维普
