Longitudinally slidable steel-concrete anti-lifting connecting member and construction method thereof

Abstract

The invention provides a longitudinally slidable steel-concrete anti-lifting connecting member and a construction method thereof which are applied to road bridges and railway bridges, and belong to the technical field of bridge structures. The connecting member is used for connecting a steel girder and a concrete bridge deck, and composed of trough type steel and a bolt; the trough type steep is pre-embedded into the concrete bridge deck; the trough type steel is connected with an upper flange plate of the steel girder through the bolt; a hole, through which the bolt passes, on the upper flange plate of the steel girder is elliptical; and the long axis of the hole is in the longitudinal bridge direction, so the bolt relative to the upper flange plate of the steel girder can slide longitudinally instead of sliding transversely. The connecting member is used in a negative moment area of a steel-concrete continuous combined bridge, so a pulling stress on the concrete bridge deck in the negative moment area can be reduced effectively, the longitudinal prestress import degree of the concrete bridge deck is increased, the long-term performance and the durability of the concrete bridge deck are improved and the vertical separating and lifting action of the concrete bridge deck can be resisted. The connecting member is wide in materials, simple in structure, quick in construction and rational in stress, and has good technical economic benefit.

Description

technical field [0001] The invention relates to a longitudinally slidable steel-concrete anti-lifting connector applicable to highway bridges and railway bridges, belonging to the technical field of bridge structures. Background technique [0002] The steel-concrete continuous composite girder bridge in the prior art is composed of a steel girder and a concrete slab, and the two are usually connected by stud connectors 6 along the entire length of the girder, such as figure 1 shown. Stud connector 6 (such as figure 2 The main functions of (shown) include: 1. Anti-slip: undertake the longitudinal shear force of the interface between the steel beam and the concrete slab, and limit the longitudinal free sliding of the interface between the two, so as to ensure that the steel beam and the concrete slab jointly deform and cooperate with each other. 2. Anti-lifting: Resist the vertical separation and lifting of the concrete bridge deck caused by the overall longitudinal bending...

AI Technical Summary

Problems solved by technology

[0004] However, for composite beams in the negative moment zone, the combination of steel and concrete will cause the concrete slab to be in tension, making it easier to crack, and the compressive stress of the lower flange of the steel beam will increase, making it more likely to be unstable

In order to reduce the tensile stress in the concrete slab and avoid its cracking, it is necessary to arrange a large number of longitudinal prestressed beams in the bridge deck in the negative moment area of ​​the composite beam, but the applied prestress will be transmitted to the upper flange of the steel beam through the stud connector, so that The introduction of longitudinal prestress is greatly reduced. In addition, the tensile stress in the concrete slab caused by shrinkage, creep and temperature effects cannot be effectively released due to the constraints of the stud connectors, which will affect the long-term performance and durability of the concrete slab. negative effect

To sum up, in the negative moment zone of continuous composite beams, the use of stud connectors will have an adverse effect on the structural stress, but if no stud connectors are used to prevent the combination of steel and concrete, although it can improve The above problems, but the vertical anti-separation and lift-off problems of concrete slabs cannot be effectively solved

Therefore, steel-concrete continuous composite girder bridges currently lack a new type of connector that can only resist lifting but not slipping in the negative moment area, thus restricting the promotion and application of continuous composite girder bridges

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