Structure Analysis Of U Bridge Superstructure Considering Pile Foundation Displacement

U bridge belongs to the category of the continuous curve bridge in essence.Curve bridge has a unique streamlined structure, smooth lines, lively, artisticconception vivid, and can give a person to enjoy the beauty.The engineeringbackground is based on the U bridge of Yuxi lock extension project, and thisthesis research the change rule of stress characteristics about U bridgesuperstructure due to the effect of pile foundation displacement, for the safety ofthe bridge to provide theoretical reference and reinforcement.The thesis reviewed the origin of the curved bridges, its development and thepresent situation at home and abroad, and summarized its structure system andforce characteristics, briefly introduced the finite element analysis method andgrillage method for curved bridges.the thesis deduced the formula of internal forceand deformation in bearing uneven settlement about the curve arc beam of threedifferent supporting, and use these formula to calculate the internal force anddeformation about three cross circular arc beam. Secondly, this thesis used a finiteelement software called Midas/Civil to establish calculation model about threecross circular arc beam, and analyzed the finite element result with the theoreticalcalculation.Next Using Midas/Civil established the grillage model of the fourthpage curve beam of highway bridge,and analyzed the internal force change rule ofupper curve box girder in the effect of pile foundation displacement, andconcluded the most unfavorable conditions of upper curve box girder in all kindsof combination pile foundation displacement. And combining with the actualworking condition, it provides some guidance for deep foundation pit excavationon highway bridge peripheral and the safety of the curved bridges.