Mchanics Performance Analysis Of The Super-span Cable-stayed Bridge With CFRP Cables

With the development of bridge technology, the constructions of great and massive bridges become the trend of the time. As an obvious advantage, super span ability of cable-strayed bridge has been attracting more and more designer. The application of some new material in massive cable-strayed bridge becomes a hot topic among researchers abroad. The structure of massive strayed bridges is soft as well as geometric nonlinearity, which made the bridges stativity and dynamicity more complex. Therefore, researching in this field is very important.Firstly, The thesis systematically describes the calculation of the finite displacement theory of cable-stayed bridge. Introducing its geometric nonlinearity influence by three factors:sag effect,axial force and bending moment produced by the coupling beam-column effect and displacement effect. Discussing the assessment principles of the stayed cable bridge. Breifly illustrate three categories of how to optimize the effort of cable-strayed bridges.Secondly, aiming at the structure characteristics of the cable-strayed bridges, the thesis illustrates the modeling method of finite element method in different aspects, like main girder,main tower, cable, boundary condition and so on. The static performance (including the constant load, vehicle load, temperature load) of the 800m-span and 1500m-span cable-stayed bridge with CFRP cables and another one with steel cables are analyzed contrastively through the midas software.Thirdly, the thesis discussing the basic theory of 3D finite elements in super cable-strayed bridges. The dynamic characteristics of the 800m-span and 1500m-span cable-stayed bridge with CFRP cables and another one with steel cables are analyzed contrastively。Finally,Considering with the sag, clination and geometry nonlinearity, a coupling parametric vibration model was built. By using this model, numerical results of CFRP cables and steel cables with the same condition are obtained, and the results demonstrate that the vibration is related with the ratio of initial disturbance and damping ratio。...