Steel-concrete combined continuous beam bridge for releasing pulling stress of carriageway slab

Abstract

The invention discloses a steel-concrete combined continuous beam bridge for releasing pulling stress of a carriageway slab. The steel-concrete combined continuous beam bridge comprises a steel beam and the concrete bridge carriageway slab fixed on the steel beam. A transverse penetrating breaking joint is formed in the position, above an intermediate pier corresponding to the continuous beam bridge, of the concrete bridge carriageway slab. The local sections of the two sides of the transverse penetrating breaking joint have relative longitudinal telescoping deformation between the concrete bridge carriageway slab and the steel beam. The pulling stress generated from high negative bending moment is unloaded and transferred to the steel beam, pulling of the concrete bridge carriageway slab is avoided, the stressing state of the whole steel-concrete combined beam is optimized, performance superiority of steel materials and concrete can be played, vertical load of the carriageway slab is directly transmitted to the steel beam, it is ensured that the carriageway slab does not generate abnormal vertical deformation, stress concentration and fatigue problems of the carriageway slab and the steel beam from fixing to separating in a junction connecting local area, construction and a construction technology of the carriageway slab are greatly simplified, and the whole stress performance of the bridge is improved, the using period of the beam bridge is prolonged, and the construction and maintaining cost are reduced.

Description

technical field [0001] The invention belongs to the field of bridge engineering equipment, in particular to a steel-concrete combined continuous girder bridge for releasing the tensile stress of the bridge slab. Background technique [0002] The steel-concrete composite continuous girder bridge has a series of advantages such as smooth running, good performance, economical materials, and convenient factory and standardized construction. The common construction method of the existing steel-concrete composite continuous girder bridge is to install the steel girder in place on the pier, hoist the prefabricated concrete bridge slab in place on the steel girder, combine the concrete with cast-in-place to form a steel-concrete composite girder bridge, and then pass Tensile prestressed steel bars exert precompressive stress on the concrete bridge slab in the negative moment section. [0003] The "Segmental Continuous Prefabrication—Steel-Concrete Composite Beam Bridge and Its Cons...

AI Technical Summary

Problems solved by technology

In this way, it is necessary to reserve pipes in the bridge slab, penetrate the prestressed steel beams, stretch the prestressed beams to the set tonnage, anchor the prestressed steel bars, grout the prestressed pipes, and finally pour the anchor concrete locally, etc. A series of cumbersome processes make the structure of the bridge slab very complicated. Engineering practice shows that in a statically indeterminate steel-concrete composite continuous girder bridge, local prestressing is applied to the concrete bridge slab in the negative moment section to avoid Cracks are often not as effective as desired

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