Lightweight steel-coarse aggregate reactive powder concrete composite beam structure

Abstract

The present disclosure provides a lightweight steel-coarse aggregate reactive powder concrete composite beam structure which comprises a plurality of segments, each segment comprising: a steel box girder comprising a bottom plate, a plurality of steel box girder webs and a plurality of steel box girder diaphragms. A coarse aggregate reactive powder concrete bridge deck comprises a plurality of precast bridge decks, a longitudinal wet joint and a transverse wet joint. A plurality of T-shaped pre-embedded steel plates are arranged on the bottom surface of the pre-fabricated bridge deck, the webplate thereof is connected with the steel box girder cross diaphragm plate, the top surface of the T-shaped pre-embedded steel plate is welded with a shear connector, and the shear connector is pre-embedded in the pre-fabricated bridge deck, so that the T-shaped pre-embedded steel plate and the pre-fabricated bridge deck form an integral whole. The invention can improve the mechanical performanceof the steel-concrete composite beam, enlarge the applicable span and scope, improve the construction speed and process quality of the bridge engineering, and overcome the problems of self-weight of the traditional steel-concrete composite beam and easy cracking of the bridge deck without reducing the mechanical performance of the concrete bridge deck.

Description

Technical field [0001] The present disclosure relates to the field of civil engineering, in particular to a lightweight steel-coarse aggregate reactive powder concrete composite beam structure. Background technique [0002] Orthogonal special-shaped plate steel box girder is widely used in long-span bridge structures due to its light weight, high bearing capacity, and convenient construction. However, due to the greater flexibility of the orthotropic bridge deck itself, fatigue cracks are likely to occur at the welds where longitudinal ribs, transverse ribs and bridge decks are connected to each other under repeated vehicle loads. In addition, the bridge deck pavement has complex forces and many diseases. [0003] Compared with the orthogonal special-shaped plate steel box girder, the conventional steel-concrete composite girder can fundamentally solve the fatigue cracking problem and improve the structural rigidity, which has certain advantages. The thickness of the concrete bri...

AI Technical Summary

Problems solved by technology

The thickness of the concrete bridge deck of the conventional steel-concrete composite beam is generally 26cm-30cm. The thicker bridge deck makes the steel-concrete composite beam structure have a larger self-weight, and the proportion of the cable force and the axial force of the tower column caused by the self-weight increases. To overcome the self-weight, the size of the cable tower and the specification of the cable must be increased, which affects its economy and the possibility of applying to bridges with larger spans

On the other hand, due to the low tensile strength of ordinary concrete and obvious shrinkage and creep effects, the concrete bridge deck will crack under the repeated action of temperature, shrinkage and creep, and vehicle loads, which will affect the safety and durability of the bridge structure. sex

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