Distortion Effect Analysis Of Thin-walled Box Girder

In recent years,with the progress of the society and promotion of the sciencetechnology,the large span Bridges increase gradually.Box-section has good structureperformance,therefore in the modern all kinds of Bridges is widely used.Thin-walledbox bridge in a certain area of section can obtain large bending moment ofinertia,torsion stiffness also are very big.Under eccentric loads,each beam rib force iseven,the bearing structure and transmission structure combine to make the commonforce components.With the economic affection at the same time,the cross section useefficiency is also high.So the mechanical properties of researching box Bridges under all kinds ofexternal load have higher practical value.But as a result of that thin-walled box girderexist bending and twisting,buckling deformation,distortion etc factors,its structureanalysis is more complex..Meanwhile,box girder structure analysis method also then isunceasingly rich and the development.In recent years,box girders for deformityaffection analysis research of the large span are paid attention.The bridge structure design and analysis of thin-walled box girder distortionaffection can not be ignored as an important subject.Similar to the concrete box girderstructure,thin-walled box girder is buckling and produce torsion under verticaleccentricn loads.In order to prevent the thin-walled box girder getting rigid constrainttorsion and distortion phenomenon under eccentric loads produce,they usually setsome diaphragm plates in thin-walled box girder internal to reduce the distortion effectin the design process.On the basis of finite element soft ware Ansys,this paper has a systematic studyon distortion effect of box girder with box girder distortion theory.Parameters of boxgirder distortion in two ways:uniform section and variable cross-section boxgirder,while distortion effect has a force analysis with figures.The paper get thedistortion shift and distortion stress when draphragm plates have been installed invariable cross-section box girder,and finally,probe the action and rationality ofdraphragm plate with area chart.