A steel truss hybrid girder cable-stayed bridge with hybrid joint structure

Abstract

The invention discloses a steel truss hybrid beam cable-stayed bridge with a hybrid joint structure, and relates to the field of the hybrid beam connection. The steel truss hybrid beam cable-stayed bridge with the hybrid joint structure comprises a steel truss, a concrete beam and a hybrid joint. The concrete beam comprises an upper concrete beam and a lower concrete beam. The hybrid joint is a box-type structure. One end of the hybrid joint is connected with the steel truss, and the other end is connected with the upper concrete beam, and the hybrid joint is not connected with the lower concrete beam. The steel truss hybrid beam cable-stayed bridge is capable of avoiding using a web to connect the upper concrete beam and the lower concrete beam, thereby reducing a dosage of concrete; andthrough the installed hybrid joint connected with the upper concrete beam and the steel truss, transmitting a force between the upper concrete beam and upper and lower layers of the steel truss, simplifying transmission of the force between the steel truss and the concrete beam, and adequately guaranteeing smooth transmission of the force between the steel truss and the concrete beam.

Description

technical field [0001] The invention relates to the field of mixed beam connection, in particular to a steel truss mixed girder cable-stayed bridge with a mixed joint structure. Background technique [0002] In order to reduce the self-weight of the existing long-span bridge structure, the main span generally adopts a steel structure, and the side spans can flexibly use steel beams or concrete beams according to the terrain. Among them, it is more economical to use concrete beams for the side spans on the shore or in shallow areas . [0003] For road-rail bridges that pass through roads and railways at the same time, truss structures are usually used as the main girder to reduce the width of the bridge deck and increase the system stiffness of the structure. Although there are many examples of hybrid girder bridges combining steel box girders and concrete box girders, hybrid girder bridges combining steel truss girders and concrete girders are rare because the combined stru...

AI Technical Summary

Problems solved by technology

The increase in the amount of concrete girders is equivalent to the corresponding increase in the reaction force transmitted to the pier that causes the supporting effect. In order to meet the force requirements, the amount of concrete in the pier also needs to be increased. Therefore, for double-deck bridges, the structure is less economical.

[0006] 2) The adaptability to side-span terrain is not strong enough

The entire length of the existing concrete girders is an integral box girder. When the height of the mid-span truss is high, the elevation of the bridge deck is limited, and the topography of the side span changes greatly, the girder height of the integral box girder is limited by the high girder height, which is easy to cause unnecessary damage. Excavation of a large amount of earthwork is not ideal for terrain adaptability

[0007] 3) The force transfer between steel truss beams and concrete beams is more complicated

Due to the layered structure of concrete beams, when the steel truss beams and concrete beams are connected together through shear connectors, the force transfer between the steel truss beams and the concrete beams is more complicated, and it is easy to make the connection between the steel truss beams and the concrete beams phenomenon of cracking

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