Research On Shear Buckling Stability Of Prestress Concrete Composite Box Girder With Corrugated Steel Webs

The structure of pre-stressed concrete composite box girder with corrugated steel web have a advantage that make full use of the properties between concrete and steel webs and force clearly so that many designers from the domestic and foreign favor it very much. However, the domestic theoretical research on this type of the bridge is still in the exploratory stage, and the practical engineering application is less, the design and construction level remains to be further improved.Shear Bearing Capacity of checking in the pre-stressed concrete composite box girder with corrugated steel web,Shear buckling of corrugated steel webs plays an irreplaceable control factor,So it is extremely necessary for it to be having qualitative and quantitative analysis.This paper based on the analysis of existing research and engineering design examples in the domestic and foreign,By using the large general finite element program ANSYS and combing with the existing theories,The web space finite element model is established with different geometric structural parameters.At the same time,The author does much linear and nonlinear finite element analysis and calculation.The research results can provide a theoretical basis for the size design with corrugated steel webs in the actual bridge, The main completed work is as follows;1 On the basis of in reading a lot of domestic and international research results which is relevant to the composite beam bridge,consolidating the corrugated steel web buckling stability theory,Summarizing the theoretical formula in linear elastic buckling strength about the web’s local buckling strength,overall buckling strength and synthesis buckling strength. And the nonlinear empirical formula considered plastic deformation.2 Using ANSYS to establish the space finite element model,In the process of modeling assumptions that all shear is undertaken by the corrugated steel webs,That is, the web is in pure shear stress state,Web geometry dimensions changes on the basis of reference to Juancheng Yellow River Bridge,Under ideal linear elastic conditions on analysis the eigenvalues buckling of the structure,respectively researching on web waveform shape changes(Wave height,Twists and turns angle,Straight plate length),Plate thickness,Web height and diaphragm distance etc,which leads the influence rule to structural buckling modes and buckling ultimate load,And substitution different examples into elastic buckling theory formula to calculate.At last the accuracy and applicability of the various computational theory is evaluated and verified.3 On the basis of the web eigenvalue buckling analysis,By ANSYS nonlinear buckling analysis functions,Using consistent defects modal method to introduce structural initial geometric imperfections,And including material nonlinearity,geometric nonlinearity and large deformation effects,etc.Enable ANSYS arc search function,And then tracking the whole process of buckling response analysis for corrugated steel webs,At last Studying the geometry of the various parameters in nonlinear finite element calculation conditions,which the whole process shear buckling load-displacement curves and trends buckling load limit of webs.And doing much research and analysis to post-buckling behavior.4 Comparing the finite element calculations and theoretical results to analyse,To evaluate the applicability in the range of the linear elastic and nonlinear the theory formula, The theoretical formulas are given by the calculation for corresponding suggestions.In this paper,through the study of corrugated steel web shear buckling stable performance,It hopes that researches can provide some theoretical reference for the design calculation and construction process of the same type of bridge.