| When a vehicle moves on a bridge at a certain speed,it can cause vibration of the body quality of mobile vehicle because of its various parts of the vehicle vibration and the influence of bridge level fluctuating.And this part finally passes to the tire in bridge,which makes the bridge random vibration and impact dynamic effect.Accordingly,the dynamic response of the bridge will be acted on the moving vehicle,and the moving vehicle and the bridge will interact with each other.With the continuous improvement of the speed of the vehicle,the vibration effect on the bridge will become more prominent,and the dynamic effect of the bridge and the road surface irregularity will have an impact on the vehicle.Therefore,vehicle-bridge coupling vibration and its vibration analysis has become the focus of the object of our study.Firstly,This thesis studied the problem of vehicle bridge coupling vibration,then analyzed the advantage and disadvantage of three kinds of classic vehicle bridge coupling model,and got the accuracy of these three kinds of models by comparing the theoretical value of literature.Then the dynamic response of simply supported beam under different vehicle speeds is analyzed.Finally,the dynamic response of a simply supported beam under sinusoidal periodic irregularity is analyzed by the displacement contact method.So,it has made a foreshadowing for the post.As one of the main forms of long-span bridges,suspension bridges play an important role in road traffic.But the suspension bridge is a flexible structure,the stiffness is small,what's more,it's easy to produce vibration under the action of the vehicle load.So this thesis analyzed the vehicle bridge coupling vibration of suspension bridge and the influence of various factors on the vibration response.Finally,we evaluated the comfort ratings of suspension bridge,to improve comfort ratings,we analyzed vibration of suspension bridge by designing different parameters of TMD. |
PDF Full Text Request