The Performance Experiments And Analysis Of Bridge Damping Material

The vibration is a very important issue for bridges and other things. For bridge, when the car or train quickly through the bridge, the bridge’s load increases rapidly, plus the weight of the bridge itself, which will bridge’s lateral vibration amplitude becomes very large, which not only cause the damage in the bridge, but also is a serious threat to the safety of people’s life. So how to control such a rapid increase of the lateral vibration amplitude, or make it increased slowly become now the main topic.There are many ways to control the vibration, the most commonly used method is install the damping bearings on the bridge. Now, the bridge damping material and damper have a variety of deficiencies, for example, the rubber material is easy to aging, and the use temperature range is very narrow. The hydraulic shock absorbers’ structure is very complex, maintenance inconvenience and so on. So, for the shortages of cushioning material and shock absorber, we developed a new type of rubber compound damping materials, to improve its damping properties, and extend material’s life, and broaden the material use temperature range. In this thesis, the experimental study and modeling of the damping properties of this new type of rubber composite are the major work.Prepare a variety of different ratio of rubber steel specimens, and then do the shearing tensile test on HT-9711dynamic servo test bench instrument respectively. Analysis equivalent horizontal stiffness, equivalent damping ratio, yield stiffness and yield force of different specimens, then draw the corresponding graph. Discuss the damping properties of the different rubber material specimens.Refer to the various shock absorber mathematical model, based on the experimental hysteresis curve. In the experimental, we get the rubber shock absorber’s force across analyzing its campaign, at the same time to establish the dynamic mathematical model, and verify mathematical model.According to the principle of cantilever test, put the CNTs into pure rubber material to detect whether the damping properties changed. Prepare several different levels of CNTs rubber composite material cantilevers, and test them on laser scanning vibrometer. Analyze the damping properties of the material by the attenuation of the amplitude of various cantilever, the first three natural frequencies and the change of the elastic modulus.