Deformation Analysis Of Composite Non-prismatic Box Girder With Corrugated Steel Web

The composite box girder bridge with corrugated steel web is one of the new bridge types.Due to its appearance,reasonable mechanical performance,fast construction speed,and relatively economic efficiency,it has been widely used in real engineering applications.In this thesis,the bending and shear deformations of the composite non-prismatic box girder with corrugated steel web are studied.The finite element method based on Timoshenko beam elements and solid-shell elements are first used to calculate the bending and shear deformations.The Simpson integral formula is then derived to calculate the bending and shear deformations of the composite non-prismatic box girder with corrugated steel webs subjected to concentrated and self-weight loads.A cantilever 80m non-prismatic single-box girder with corrugated steel webs subjected to concentrated and self-weight loads is simulated as a numerical example.The effect on the shear deformation due to the concrete deck is also quantitatively studied.For the comparative analysis,the beam element model and solid-shell element model of the cantilever 80m non-prismatic single-box girder with corrugated steel webs are established.The bending and shear deformation based on the proposed three methods are carefully compared.By comparing to the results based on the solid-shell element model,the errors of the calculated bending and shear deformations based on the Simpson integral formula due to the concentrated load are 1.3%and 13.4%,and the errors of the calculated bending and shear deformations based on the beam element model are 4.6%and 34.1%.On the other hand,the errors of the calculated bending and shear deformations based on the Simpson integral formula due to the self-weight load are 2.8%and 15.8%,and the errors of the calculated bending and shear deformations based on the beam element model are 5.5%and 29.7%.Finally,the bending and shear deformations of Nanfeihe bridge,which is a single chamber three room non-prismatic box girder with corrugated steel webs,subjected to the 15^th block load are calculated based on the Simpson integral formula.For the comparative analysis,the beam element model and solid-shell element model of the bridge are also established.In order to consider the effect of the pre-stressed rebar,the deformation due to the pre-stress effect is also obtained based on the beam element model.Compared the real measure deformation,the maximum error based on the Simpson integral formula is 14.21%,the maximum error based on the solid-shell element model is 11.12%,and the maximum error based on the beam element model is25.16%.The final results show that the proposed Simpson integral formula can be effectively used to calculate the bending and shear deformations for the composite non-prismatic box girder with corrugate steel webs.The calculated bending and shear deformations based on the proposed Simpson integral formula is in good agreement with the results based on the solid-shell element model and real measured data.However,the proposed method is simple and efficient for the deformation calculation and can be further apply to the deformation analysis during the construction process.