Main beam structure and bridge

Abstract

The present invention discloses a main beam structure and a bridge, and relates to the field of bridge engineering. The present invention provides a main beam structure comprising at least one square-shaped steel main beam and at least one I-shaped steel main beam, wherein the at least one square-shaped steel main beam comprises two square-shaped steel webs, a square-shaped steel top plate and a square-shaped steel bottom plate, the square-shaped steel top plate and the square-shaped steel bottom plate are respectively disposed at the two ends of the two parallel square-shaped steel webs; theat least one I-shaped steel main beam comprises an I-shaped steel web, and the both ends of the I-shaped steel web are each provided with an I-shaped steel top plate and an I-shaped steel bottom plateperpendicular thereto; and the square-shaped steel main beam has a transition section and the transition section is connected with the I-shaped steel main beam. The bridge includes the main beam structure. The main beam structure can control the crack width of a bridge panel, so that the durability of the bridge is better, thereby prolonging the life of the bridge.

Description

technical field [0001] The invention relates to the field of bridge engineering, in particular to a main beam structure and a bridge. Background technique [0002] Long-span combined girder cable-stayed bridge The combined girder is the key structure of the bridge. The static bearing capacity and fatigue resistance of the structure are directly related to the safety and durability of the bridge. The main girder section types of the combined girder cable-stayed bridge generally include: bilateral I-beam composite beams, bilateral box composite beams, open box composite beams and truss composite beams. The cross-sectional forms of composite girder cable-stayed bridges built at home and abroad with a main span of more than 500m are as follows: [0003] Table 1 Composite girder cable-stayed bridges built at home and abroad with a main span of more than 500m [0004] [0005] According to the situation of the combined girder cable-stayed bridges that have been built at home ...

AI Technical Summary

Problems solved by technology

However, the axial pressure on the main girder at the pylon of the long-span combined beam cable-stayed bridge and the negative bending moment at the side-span auxiliary pier are relatively large, and the I-beam section is difficult to meet the requirements due to its relatively small cross-sectional area and high stress level.

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