Research on Mechanical Behavior and Structural Parameters of Key Teeth in Glued Joint of Curved Precast Segmental U Girder Bridges
In order to understand the mechanical performance of the key teeth in the glued joints of curved precast segmental U girders and to select appropriate structural parameters,this study takes the elevated bridge of Line 1 of the Bogota Metro in Colombia as the background.A finite element model of the midspan section of the curved U girder was established in ANSYS,to analyze the load bearing behaviors of the girder under typical loading conditions.The arrangement and dimension of key teeth were analyzed.It is shown that although the loads applied are symmetrical,the structure still bears severe torsional deformation,under the action of prestressing tendons and externally-added loads.When the number of key teeth is increased from 4 to 24,the shear carrying capacity of the glued joint is increased by about 17.28％;when the bottom area of a single key tooth is increased from 0.04 m2 to 0.15 m2,the shear carrying capacity of the glued joint is increased from 121.302 MN to 143.812 MN,with an increase of about 18.55％.By reducing the number of key teeth on the inner side of the curved girder,the torsional deformation of the curved precast segmental U girder can be effectively improved without compromising the shear carrying capacity.
elevated bridgecurved U girderprecast segmental girderglued jointmechanical performancestructural parameterfinite element method
万方数据
维普
