Analysis Of Transverse Internal Force Of Corrugated Steel Web Steel Bottom Box Girder

With the development of China’s transportation industry,the box girder structure is developing in the direction of thin-walled,multi-room,and large cantilever.Under the load of the vehicle,the bridge deck often produces a large lateral internal force.Therefore,how to adopt simple and effective in engineering design The method of solving the lateral internal force of the box girder has become the focus of designers.The corrugated steel web box girder is a relatively new structural form.The lateral force under the load of the vehicle is also a subject that needs to be studied in depth.This paper has studied the lateral internal force of this special structure,and its main content as follows.(1)Based on the basic principles of the frame analysis method,considering the coordinated relationship between the distortion displacement of the box girder structure and the displacement of the micro-element frame,the relevant calculation formula for calculating the transverse internal force of the box girder with corrugated steel web steel floor is derived,and The results of finite element analysis and the transverse bending moment calculated according to the formula in this paper are compared and analyzed,thus verifying the rationality of the calculation formula deduced in this paper.(2)Based on the basic principle of the energy variation method,the energy variation method of the transverse bending moment of the box girder with corrugated steel web and steel bottom plate is obtained by establishing a control differential equation for solving the shear difference T on the box girder top plate,based on the same In the calculation example,the frame analysis method and the energy variation method are used to compare and analyze the transverse bending moment values at each key point of the mid-span section.The research results show that the bending moment errors at the corner points C and D of the frame method are-6.40% and-8.24%,respectively,and the results calculated by the energy variation method reduce the bending moment errors at the corner points C and D to 3.45.% And 3.53%,effectively reducing the bending moment error on the bottom of the box beam.(3)In order to find a more convenient and effective method for calculating the lateral internal force,this paper introduces a correction factor based on the calculation results of the rigid support frame method.Through numerical examples,the effect of changes in parameters such as aspect ratio,roof thickness and web inclination angle on the transverse bending moment correction factor and transverse bending moment of the box girder roof is analyzed in detail.The results show that when the inclination angle of the web is about 45° and the width-height ratio of the box girder is about 3,the peak value of the transverse bending moment on the top plate is the largest,and the transverse bending moment correction coefficient is close to 1.At this time,the final transverse direction can be replaced by a rigid support solution.Bending moment value.(4)Using the finite element method,the influence of the lateral slip between the top plate and the web of the corrugated steel web box girder and the web on the transverse bending moment was studied,and the transverse bending moment of the box beam along the longitudinal bridge was analyzed Variation rule and lateral stress of corrugated steel web box girder and corrugated steel web box girder The results show that under the two operating conditions,the maximum errors of the maximum tensile stress of the roof when considering the lateral slip between the corrugated steel web and the roof and without considering the lateral slip are 1.93% and 2.99%,respectively.The impact is small,so this effect can be ignored in actual engineering.