Corrugated web prestressed frp-concrete composite box girder and its construction method

Abstract

The invention belongs to the field of new material new structures and combination structures in civil engineering and particularly relates to a corrugated web prestress FRP-concrete combined box beam and a construction method thereof. The combined box beam comprises an FRP box beam body, and every two adjacent corrugated webs between a top plate and a bottom plate form a box beam box chamber; and each box beam box chamber is internally provided with an external prestress bar, the two ends of each external prestress bar are connected to the two longitudinal ends of the top plate correspondingly, tension can enable the FRP box beam body to generate a pre-camber in the height direction, and concrete is poured at the top of the box beam body. Each external prestress bar is tensioned in the corresponding box beam box chamber, so that a beam body generates a certain pre-camber in the height direction; thus, the lower flexibility of the FRP-concrete combined box beam under the vehicle load is decreased, the method that the use quantity of FRP or concrete materials is increased to meet structural rigidity in the past is changed, the self weight of the structure is decreased, and the manufacturing cost is reduced; and the problems of shrinkage creep of a traditional prestressed concrete structure and prestress bar loosening and the like are solved.

Description

technical field [0001] The invention belongs to the field of new materials, new structures and composite structures in civil engineering, and in particular relates to a corrugated web prestressed FRP-concrete composite box girder and a construction method thereof. Background technique [0002] With the long-term operation of infrastructure such as bridges, problems such as environmental erosion and material aging will inevitably appear, among which steel corrosion, concrete cracking, and peeling are the most common problems. Especially in the north, the use of deicing salt leads to the corrosion of reinforced concrete structures, and the deterioration rate is further aggravated. Chloride ions or other corrosive substances diffuse from the surface layer to the surface of the steel bars through the tiny pores of the concrete, so that the steel bars corrode and expand, and finally lead to concrete corrosion. Cracks, peels and falls off. This not only reduces the normal service...

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Problems solved by technology

[0003] The present invention aims at the disadvantages of existing FRP-concrete composite beams, such as heavy structure, small overall rigidity, easy buckling and shear failure of the web, weak FRP-concrete interface and poor bonding performance, etc., and provides a structure with small overall deformation, high bearing capacity, New prestressed FRP-concrete composite box girder with corrugated webs and its construction method with light weight and poor sliding of FRP-concrete interface effectively solved

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