Steel-ultrahigh-toughness concrete combined bridge deck slab based on steel bar truss connection

Abstract

The invention discloses a steel-ultrahigh-toughness concrete combined bridge deck slab based on steel bar truss connection. The combined bridge deck slab is composed of a steel bridge deck top plate, stiffening ribs, upper chord steel bars, lower chord steel bars, web member steel bars, upper part and lower part connecting steel bars and ultrahigh-toughness concrete. The web member steel bars are pressed into a wave shape and welded with an upper chord member and the lower chord member through a welding machine, and therefore a single steel bar truss is formed. The steel bar trusses are transversely and continuously placed side by side along the bridge floor, are connected into a whole through the upper part and lower part connecting steel bars and then are welded on the bridge deck top plate to form a steel framework. The ultrahigh-toughness concrete is poured on the bridge floor steel framework to play a role in protecting the bridge deck. In the combined bridge deck deck slab system, the stress mode of the steel bar truss system is reasonable, good overall working performance is achieved, and the fatigue performance of the structure is improved while the cost and construction complexity are reduced.

Description

technical field [0001] The invention relates to the technical field of structural engineering, in particular to a steel-ultrahigh toughness concrete composite bridge deck connected based on a prefabricated steel bar truss system. 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...

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; fourth, the steel structure part of the existing composite bridge deck system is usually welded on the construction site. The on-site workload is heavy and the construction quality and precision are difficult to guarantee

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