Model Test And Finite Element Analysis Of Expansion Device For Cable-Stayed Bridges

A new type of force transfer expansion device, which structure is similar to piston in mechanical structure, was studied in this thesis. This device can not only release the axial displacement, but also bear a certain amount of moment and ensure the smoothness of the deck. There has been a few tests of this type of device, which made the relevant test lack of references. Around finite element analysis and model test of this new device, the following researches have been completed in this thesis:Firstly, realizable test loading scheme was designed based on the results of finite element analysis of the device model. The finite element analysis of real model under test loading scheme was conducted, and its results were compared with the same model under real loading scheme. The conclusion is that the test loading scheme can simulate the device under the real load.Secondly, finite element analysis was performed on test model, which was simplified from the real model. By comparing the finite element analysis results under test loading scheme of both test and real model, it can be confirmed that the test model can reflect the mechanics characteristic of the real model.Thirdly, the test was conducted in laboratory. Both stress and displacement response of the test model were measured to validate working performance of the device and wear resistance of supports.Finally, by comparing both results of test and finite element analysis, the accuracy of numerical results was proved. With the analysis of the difference between the results, some possible reasons for the difference were proposed, which provide experience reference for same type tests.