Section steel-UHPC composite board and bridge deck

Abstract

The invention discloses a section steel-UHPC composite board. The section steel-UHPC composite board comprises a plurality of pieces of section steel and UHPC boards fixedly connected to the section steel. Each piece of section steel comprises an upper flange and a web, and the end of the upper flange is provided with an outwardly extending upper flange extension section. The invention also discloses a bridge deck. The bridge deck is mainly formed by connecting a plurality of section steel-UHPC composite boards in the longitudinal bridge direction, the adjacent section steel-UHPC composite boards are connected through a cast-in-situ connection part, and the ends of the upper flanges are provided with upper flange outward extension sections and lower flange outward extension sections that extend towards the insides of the cast-in-situ connection parts respectively. The section steel-UHPC composite board and the bridge deck solve the problems of easiness in cracking of bridge decks in anegative moment region at the transverse joint of the inner fulcrum of a continuous beam bridge and easiness in cracking of a transverse joint between bridge decks at the midspan main beam in the midspan of a cable-stayed bridge.

Description

technical field [0001] The invention belongs to the field of bridge engineering, and in particular relates to a composite plate and a bridge deck for forming bridge decks. Background technique [0002] For steel-concrete continuous system girder bridges, it has been widely used because of its good mechanical performance, less expansion joints, comfortable driving, good economy, and convenient construction. The internal fulcrum will generate a huge negative bending moment, and the long-span continuous girder bridge is very sensitive to its own weight. The increase of the structural self-weight will further increase the negative bending moment of the continuous girder bridge internal fulcrum, which will lead to The tensile stress of the bridge deck is much greater than that of other parts, so there is a risk of cracking of the bridge deck in the inner fulcrum area, which is the main reason for limiting the span of steel-concrete continuous system girder bridges to exceed 150 m...

AI Technical Summary

Problems solved by technology

For traditional composite girder cable-stayed bridges, the steel-UHPC composite deck can reduce the self-weight of the main girder and further increase the span of the composite girder cable-stayed bridge. The beams will still bear the tension, and the transverse connection between the decks of the main girders is a weak section, where there is still a risk of cracking of the decks

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