Analysis of Flat Steel-Box-Girder of Cable-Stayed Bridge by Finite Mixed Element Method

A finite element method was proposed to analyze the mechanics behavior of flat steel-box-girder of cable-stayed bridge.In the method both beam element with six free degrees and shell element were employed to simulate different parts of girder simultaneously.The method can calculate not only the member stresses but also the whole stability,local stability,and their interaction,and the analysis example shows its result is satisfying.Mechanics behaviors of Sutong bridge were computed by this method,and longitudinal stress,transversal stress of plates of the girder and section stress distribution were discussed consequently.