A type of asymmetric cross-section box girder for both road and rail transport.

By using a steel-concrete composite beam on the highway side and a steel box girder on the railway side, the problem of lateral eccentric load effect caused by the railway side dead load being greater than the highway side dead load in the main girder of long-span bridges was solved, and the self-balancing force and economic efficiency of the main girder were improved.

CN117926688BActive Publication Date: 2026-05-26CHINA RAILWAY MAJOR BRIDGE RECONNAISSANCE & DESIGN INSTITUTE CO LTD
2 Cites 0 Cited by

Patent Information

Application Number
CN202410021873.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-01-05
Publication Date
2026-05-26
Estimated Expiration
2044-01-05

AI Technical Summary

Technical Problem

In cable-stayed bridges with long spans and asymmetrical arrangement of railway and highway on the same level, the dead load on the railway side of the main beam is greater than that on the highway side, resulting in a lateral eccentric load effect. This leads to a complex stress system and poor economic efficiency.

Method used

The design adopts an asymmetrical box girder structure with steel-concrete composite beams on the highway side and steel box girders on the railway side. By adjusting the thickness of the bridge deck of the highway and railway sections and the composite beam, the center of gravity of the main girder is located on the transverse centerline of the bridge. The concrete bridge deck and the steel beam are integrated to share the load, giving full play to the compressive strength of the concrete and the tensile strength of the steel beam.

Benefits of technology

It eliminates the eccentric loading effect, improves the stiffness and stability of the main beam, reduces the amount of steel used, has good economic benefits, and reduces the total investment of the project.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

This application relates to an asymmetrical cross-section box girder for both highway and railway on the same level, comprising: a highway-concrete composite beam and a railway steel box girder. The highway-concrete composite beam includes steel beams arranged along the longitudinal direction of the bridge and a concrete bridge deck at the top of the steel beams. The railway steel box girder is arranged along the longitudinal direction of the bridge and is located on one side of the highway-concrete composite beam. In this invention, the highway side is a steel-concrete composite beam. The concrete bridge deck at the top of the steel beams increases the stiffness and stability of the main beam while also increasing the self-weight of the highway-side beam. This arrangement results in the first constant load per meter in the transverse direction of the highway side being greater than that of the railway side. Because the second constant load of the highway is less than that of the railway, by appropriately adjusting the second constant load of the highway and railway, as well as the thickness of the bridge deck of the composite beam, it is possible to achieve a sum of the first and second constant loads per meter in the transverse direction of the highway-side composite beam equal to the sum of the first and second constant loads per meter in the transverse direction of the railway-side steel box girder. This ensures that the center of gravity of the main beam section is located on the transverse centerline under dead load, thereby eliminating the eccentric loading effect caused by the asymmetrical arrangement of the highway and railway.
Need to check novelty before this filing date? Find Prior Art