Parameters' Sensitivity Analysis of Extradosed Cable-stayed Bridge

A 3-dimensional finite element calculating model is established for the main bridge of the 2nd Yellow River bridge in Kaifeng,which is an extradosed cable-stayed bridge,on its maximal cantilever construction stage by using software MIDAS/Civil.By taking into account all kinds of influencing parameters in bridge construction,including the bulk density of reinforced concrete,the Young's modulus of reinforced concrete,the sectional dimension of main girder,the Young's modulus of stayed cables,the initial tension of stayed cables,the prestress of main girder and the construction loads,their sensitivities are calculated respectively and those parameters which have an obvious effect on the displacement and stress of the main girder are picked out.The calculated results indicate that the main designed parameters include the bulk density of reinforced concrete,the sectional dimension of main girder,the initial tension of stayed cables,the prestress of main girder and the construction loads.On the contrary,the Young's modulus of reinforced concrete and the Young's modulus of stayed cables are the secondary designed parameters.The conclusions can be of some help to the construction control of the bridge.