Steel reinforcement arrangement structure of steel structure-concrete slag combined bridge

Abstract

The invention relates to a steel reinforcement arrangement structure of a steel structure-concrete slag combined bridge. Transverse main reinforcements are bent to form hoops at combined notches and extend over the top surface of a steel structure, the hoops and the transverse main reinforcements on the hoops form overall rib structures, the overall rib structures and shear pins inside the notches are arranged in a staggered mode to form the steel reinforcement arrangement structure, and the steel reinforcement arrangement structure serves as a top slab tendon, a combined notch reinforcement stirrup and a bottom slab tendon. According to detailed construction requirements, steel reinforcement arrangement structures are arranged at different intervals. Cast-in-place concrete is used for pouring the combined notches, the shear pins and the steel reinforcement arrangement structures into a bridge deck slab. Transverse closed steel reinforcement hoop concrete regions formed at the combined positions can improve the bearing capacity of the concrete. The transverse steel reinforcements continuously pass through the combined notches without affecting transverse stress performance, and the steel reinforcement arrangement structure is safer and more reliable because peak value hogging moment is borne by the two main reinforcements. Construction is easy and convenient, and because each hoop is formed by a complete steel reinforcement, the steel reinforcement arrangement structure can be better adapted to influences caused by construction errors.

Description

technical field [0001] The invention relates to a steel bar reinforcement structure of a steel structure-concrete slab combined bridge, which is mainly applied in the field of highway bridges, railway bridges and other building structures using steel-concrete combination. Background technique [0002] The combination notch is a complex stress area of ​​the steel-concrete composite structure, which is usually equipped with shear studs, longitudinal common steel bars, transverse common steel bars, transverse prestressed steel bars and cast-in-place concrete. [0003] After the bridge is completed, the transverse reinforcement not only needs to bear the longitudinal stress brought by the bridge deck as the roof of the first system, but also be affected by the transverse bending moment and vertical shear force brought by the vehicle load. Therefore, the transverse reinforcement in this area often needs to consider the shear resistance needs of the interaction with the shear stud...

AI Technical Summary

Problems solved by technology

In the Eurocode, an independent vertical hoop is added in this area. Although the number of shear reinforcement of the bottom slab is increased, the upper edge of the hoop of the top slab is a waste of material

The method in America is to increase the number of open U-shaped stirrups, which also increases the number of shear reinforcement in the bottom plate, but the U-shaped reinforcement is open on the top surface and cannot resist the lateral bending moment in a local area.

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