Connecting structure of combined beam and concrete bearing cross beam

Abstract

The invention discloses a connecting structure of a combined beam and a concrete supporting cross beam, comprising a steel girder and a concrete supporting cross beam, wherein the steel girder is disconnected at an intermediate pivot and is connected with the concrete supporting beam; an end plate is arranged at the end part of the steel girder and is provided with an open pore plate or is connected with the steel girder and the concrete supporting cross beam through weld screws so as to transfer the shearing force and the bending moment of a beam body; constructional steel bars are arranged in the concrete supporting cross beam; the constructional steel bars and a main forced steel bar form a steel reinforcement cage together; and a concrete pier is provided with a support seat which is supported on the bottom of the concrete supporting cross beam. The connecting structure reduces the tensile stress of a bridge panel in a negative bending moment area, caused by the shrinkage, the creep and the temperature of the concrete, and has concise and definite force transfer; and in addition, the prestress is not required to apply on the negative bending moment area and a bent cap is omitted. A steel structure is not required for welding on site and the adjustability of the distribution position of the pier is favorable.

Description

technical field [0001] The invention belongs to the technical field of bridge engineering and relates to a connection structure between a composite beam and a concrete supporting beam. Background technique [0002] The steel and concrete continuous composite girder bridge has a large spanning capacity and effectively utilizes the advantages of the composite structure, but the beam body on the middle pier bears a large negative bending moment, and the method of adding longitudinal prestressed tendons to improve its stress There are defects such as difficult construction, inconvenient partial repair or renovation; the shrinkage, creep and temperature deformation of the concrete bridge deck are constrained by the steel beam, and it is also easy to cause tensile stress in the bridge deck at the middle fulcrum and then produce cracks. Therefore, steel and concrete are continuous. How to bear the tensile stress and prevent the occurrence of harmful cracks on the concrete deck of c...

AI Technical Summary

Problems solved by technology

[0002] The steel and concrete continuous composite girder bridge has a large spanning capacity and effectively utilizes the advantages of the composite structure, but the beam body on the middle pier bears a large negative bending moment, and the method of adding longitudinal prestressed tendons to improve its stress There are defects such as difficult construction, inconvenient partial repair or renovation; the shrinkage, creep and temperature deformation of the concrete bridge deck are constrained by the steel beam, and it is also easy to cause tensile stress in the bridge deck at the middle fulcrum and then produce cracks. Therefore, steel and concrete are continuous. How to bear the tensile stress and prevent the occurrence of harmful cracks on the concrete deck of composite girder bridges is still a difficult problem to be solved

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