A Study On Nonlinear Aerostatic Stability Of Cable-stayed Bridge With Open-section Girder

The cable-stayed bridges are longer and larger,and therefore the stability problem under wind load is becoming more and more serious.Especially for cable-stayed bridges with opensection girder,its torsional stiffness is relatively weak and nonlinear effects are more evident.This paper summarizes the research of the aerostatic stability of the cable-stayed bridge,using the software Fluent to computer the third component force coefficient of the section,considering the nonlinear effects of the structural geometrics,aerostatic load and material,and then developes a nonlinear aerostatic stability program for the cable-stayed bridge with opensection girder.Using the Luoxi Bridge and the Honghe Bridge was used as the engineering background,this paper analyzes their nonlinear aerostatic stability,and discusses the influence of different factors on it.Main contents provided in this paper are summarized as follows:1.Reviewing the previous aerostatic stability research of the cable-stayed bridge,including the nonlinear theory and structural stability analysis theory.Considering the nonlinear effects of the structural geometrics,aerostatic load and material,and then developes a nonlinear aerostatic stability program for the cable-stayed bridge with open-section girder based on Fortran language.2.Introducing Computing Wind Engineering(CWE),using CFD software Fluent to replace the wind tunnel test and calculate the third component of the open-section girder;3.establishing the finite element model of Luoxi Bridge expansion project and the Honghe Bridge.Analyzing the nonlinear aerostatic stability and discussing different factors which have influence on the aerostatic stability.The calculation and analysis conclusions of this paper have some practical significance on aerostatic stability of Luoxi Bridge and Honghe Bridge,and also have some reference value for the same type of research.