Static And Dynamic Analysis Of Long-span And High Speed Railway Extradosed Cable-stayed Bridge

Extradosed cable-stayed bridge appeared relatively late in our country.Because of convenient construction,high stiffness and good seismic performance,Extradosed cable-stayed bridge obtained the rapid development in our country,especially in the railway bridge,It satisfied the stiffness of the bridge and increased the bridge span.Many earthquakes happened in our country,Combined with Extradosed cable-stayed bridge appeared later,So seismic response research is not comprehensive enough,This paper is based on the cable-stayed bridge in yuanjiang,Using MIDAS/CIVIL to establish three-dimensional finite element model.Research on the static and dynamic characteristics,some important conclusions are drawn as follow.(1)Simulating the whole construction of the bridge.Analyze internal forces and stresses of longest cantilever construction stage and finished bridge state.Check the stress of finished bridge state and the deflection of train load.All meet the specification requirement.(2)Selecting multiple parameter variables,study the influence of displacement,internal force and stay-cables force.Get the degree of influence.Ensure the safety and reliability of the construction.(3)Conducting the analysis of the reaction spectrum.Compare the results of European norms and Chinese norms.The results are very close.We can verify each other in the calculation.Use relative displacement method to stimulate the structure.It is found that as the wave velocity increases,the results of its displacement and internal forces tend to be the result of an excitation.(4)Analyzing the non-linearity of the boundary.Get the optimal parameter is r=6m,u=0.07 of pendulum system bearings.At the same time.The bridge pier displacement and the internal force are greatly reduced.Offer two options that fully bridged and partially arranged by shock absorber,when you think about economy,adopt partially arranged.(5)Analyzing the bridge pier of material nonlinearity.Compute the bending moment.The bridge pier is in an elastic state under the design of the earthquake.Under the large earthquake,the bottom section of the pier folds.After setting up the vibration isolation mount.In the event of a major earthquake,The pier won't do much damage.