Research On Shear Lag Effect Of Simply Supported Box Girder

Box girder compared with other bridge type,because of its good use of performance and other advantages,making it the most widely used in bridge construction.But in the same case compared to other bridge type,box girder by the shear lag effect of the most significant damage,and this is the engineering sector has been unsolved problems.With the rapid development of social traffic,the design of box girder section needs to be improved and optimized by the function,environment,cost and other factors.The optimal design of section can reduce the effect of shear lag effect.Based on this,this paper relies on the research on the effect of reinforced concrete shear lag in Hebei Province,which is based on the research on the effect of reinforced concrete shear lag in Hebei Province(project number: 213).The simple section of the box girder is discussed,The Effect of Shear Lag Effect on Cross Section.It provides a new research idea for the optimization of the simply supported box girder section.In this paper,the following work is completed:1,this paper studies the plexiglass model test,and analyzes the influence of the cross-section shear lag coefficient on the geometrical characteristics of the simply supported box girder,Carried out in-depth discussion and research,and gives the corresponding conclusions.2,the "ZK standard live load" condition in the "high-speed railway design specification TB 10621-2014" is calculated for the 32-meter simply supported box girder.The shear lag coefficient,wing and web The longitudinal shear stress changes are analyzed in detail.3,the variation law of shear lag coefficient,deflection and normal stress of cross section of the simply supported box girder under moving load is studied.4,the variation law of shear lag coefficient,deflection and normal stress of the cross section of the simply supported box girder under earthquake loading is studied.5,the formula of calculating the shear lag coefficient is analyzed by the energy variational method,and the optimal calculation method is given.Through the research of this subject,we provide a kind of research thought for future generations: how to reduce the influence of shear lag effect better when the actual situation needs to optimize the design of the simply supported box girder section,but also take into account the bridge Of the other mechanical behavior,so as to optimize the cross-section design of box girder,bridge design and construction of our country is of great significance.