Cold-formed steel tough combined bridge deck with box-shaped ribs

Abstract

The invention discloses a cold-formed steel tough combined bridge deck slab with box-shaped ribs. The cold-formed steel tough combined bridge deck slab is composed of cold-bending hemming section steel, transverse reinforcing steel bars and ultrahigh-toughness concrete. The cold-formed steel is transversely and continuously placed along the bridge deck and forms bridge deck steel framework throughfillet weld welding. Box-shaped ribs are formed on the lower side flanges of the cold-formed steel, the upper side flanges are short and are provided with a row of round holes, and transverse steel bars penetrate through the cold-formed steel flanges through the round holes. And the ultrahigh-toughness concrete is poured on the bridge deck steel skeleton to play a role in protecting the bridge deck steel skeleton. According to the invention, the ultrahigh-toughness concrete can ensure that no or only tiny cracks below 100 microns are generated, so that the toughness and durability of the structure are improved; the structural mode of combining the cold-formed steel and the transverse reinforcing steel bars replaces the anti-shearing and anti-pulling effects of studs; meanwhile, the out-of-plane stability and the transverse torsion stress performance of the bridge deck slab are remarkably improved through the box type closed stiffening ribs, the material cost and the construction complexity are remarkably reduced, and the fatigue performance is excellent.

Description

technical field [0001] The invention relates to the technical field of structural engineering, in particular to a cold-formed steel ductile composite bridge deck with box ribs. Background technique [0002] With the continuous advancement of my country's infrastructure construction process, people realize that the convenience of intra-city traffic and inter-city traffic greatly affects the development of the national economy and social progress; therefore, the country has achieved great development in road and bridge engineering in recent decades . Among them, bridge structures are not only widely used in urban overpasses, subway light rails, high-speed railways, etc., but also in river-crossing and sea-crossing structures. In recent years, with the construction of super-large bridge projects such as the Hong Kong-Zhuhai-Macao Bridge and the Hangzhou Bay Bridge, bridge structures at home and abroad are facing unprecedented opportunities for development. In the construction ...

AI Technical Summary

Problems solved by technology

However, there are still some problems in the existing steel-concrete composite bridge deck: First, in order to ensure the sufficient shear connection between steel and concrete and prevent the detachment of the two interfaces, more bolts are usually arranged between the two Nails (playing the dual role of shear resistance and pull resistance), which greatly increases the construction workload, and the fatigue performance of the structure is affected due to the existence of welds; second, the steel deck part of the composite bridge deck usually needs to be welded out of the plane Multiple stiffeners, which also increase the amount of construction and affect the fatigue performance of the structure; third, ordinary concrete materials are prone to cracking under tension, and are sensitive to local defects, and are prone to cracks under long-term loads, causing water and ion erosion, affecting The corrosion resistance and durability of the bridge deck will significantly increase the repair and maintenance costs of the bridge structure, causing a huge waste of manpower and material resources

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