Method for improving bearing capacity of multi-target-oriented existing hollow slab girder bridge

Abstract

The invention discloses a method for improving bearing capacity of a multi-target-oriented existing hollow slab girder bridge, and relates to a bridge bearing capacity improving method. An original bridge deck pavement is dismantled; a hollow slab beam bottom is longitudinally and continuously pasted with a seam-spanning type composite plate; a gradual change type rigidity calculation model for connection between the bridge deck pavement and a main beam is established, the arrangement range of rigid connecting pieces and flexible connecting pieces is determined, and corresponding arrangement is carried out; a double-layer stressed reinforcing mesh is laid and fixed above the hollow slab; and a concrete pavement layer is poured, and non-uniform rigid-flexible mixed connection is achieved. The bridge deck pavement is calculated according to a gradual change type rigidity calculation model, the bridge deck pavement and the hollow slab beam are effectively combined and connected through anon-uniform rigid-flexible mixed connection method, and the joint-spanning type combined plate is longitudinally and continuously pasted to the hollow slab beam bottom. Longitudinal bending resistance, longitudinal shear resistance, transverse bending resistance and transverse shear resistance bearing capacity of an existing hollow slab girder bridge are effectively improved.

Description

technical field [0001] The invention relates to a method for improving the bearing capacity of a bridge, in particular to a multi-objective-oriented method for improving the bearing capacity of an existing hollow slab girder bridge, which belongs to the technical field of bridge reinforcement. Background technique [0002] According to the "Statistical Bulletin on the Development of the Transportation Industry in 2018", by the end of 2018, 851,500 highway bridges had been built, with a total of 55.6859 million meters. With the increasing traffic load and the normal decline of bridge structural performance, some bridges cannot meet the requirements of normal use, especially for hollow slab girder bridges. The transverse connection performance between the girders is degraded, and in severe cases, a single girder will be stressed, which will aggravate the damage of the bridge and pose a huge safety hazard. [0003] For the reinforcement method of the hinge joint damage of the ...

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Problems solved by technology

The anchoring process of tensile transverse prestressed carbon fiber panels is complicated, and the eccentric load of the side beam is large, which is not conducive to the structural force

[0004] In addition, with the increase of the service life, the load level given by the code is also continuously improved, and considering various diseases of the bridge, the problems brought about are the longitudinal bending resistance, longitudinal shear resistance, transverse bending resistance and transverse resistance of the existing bridge. None of the shears meet the design requirements of the current specifications, which is unsafe for users and belongs to engineering taboos

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