| 摘要 |
The present invention relates to an upper structure of a continuous bridge having composite structure of a box girder type and a truss type. The upper structure of the continuous bridge includes at least two rows of box girders including an upper flange, a lower flange, and a pair of double portions connecting the upper and lower flanges and installed on a section where positive moment is generated by a fixed load; at least two rows of truss girders including an upper chord, a lower chord, and multiple connectors connecting the upper and lower chords, installed on a section, where negative moment is generated, and arranged to be curved by including a curved section; at least two rows of connection units connecting the truss girders and box girders in the transverse direction; and a bracing material connecting an upper chord of the adjoining truss girder on one side of a supporting unit of the truss girder installed on the curved section and a lower chord of the truss girder on the other lateral side thereof in the transverse direction and connecting a lower chord of the adjoining truss girder on one side of the supporting unit of the truss girder installed on the curved section and an upper chord of the truss girder on the other side thereof in the transverse direction. Therefore, the present invention provides the upper structure of the composite type continuous bridge capable of reducing uneven torsional deflection generated in the truss girders on the inner and outer sides of the radius of curvature by connecting the truss girders, which are positioned on the inner and outer sides of the radius of curvature, with the bracing material crossing in the transverse direction in order to reduce axial force and a torsional difference generated between the upper and lower chords of the truss girders, which are installed on the inner and outer sides of the radius of curvature; capable of enhancing the margin of safety in the horizontal direction of a bottom plate by reducing an axial force of a horizontal beam connecting the truss girders; and capable of improving load-carrying performance of the whole structure of the bridge. |
