An Analysis And Numerical Simulation Of Vertical Mechanical Characteristics For Suspension Bridge And Stabilized Suspension Bridge

In present thesis,the analytical formula,which include the vertical flexural vibrating frequencies,the static deformations under vertical loads and the oscillations with the moving loads,are obtained through applying Galerkin method to the vertical deflection equation of the suspension bridge.Then the validity of analytical solutions are check through the finite element analysis.The results show that the cables,the stiffening girder,and the bridge mass have an influence on the vertical flexural stiffness and vibration frequencies of the suspension bridge.The stabilized suspension bridge is structure through adding two tension cables under the suspension bridge deck.Therefore,the structure is in a pre-tensioned condition.The tension condition of the stabilized suspension bridge has more significant influence than the suspension bridge.The main works of this thesis are as follow:First,The Galerkin method is applied to solve the vertical differential integral equation of the suspension bridge.The analytic formula of vertical stiffness and vibration frequencies are obtained for the suspension bridge.Then the displacement response under the static load and the moving load are acquired.Applying analytic solutions and finite element analysis to the different bridges,the influence of structural parameters on bridge frequency and stiffness are discussed.Second,this thesis deduced the tension relationship between the main cables and the inverted cables for the stabilized suspension bridge.Then the properties of the frequencies and stiffness of the stabilized suspension bridge are researched by the finite element software.