Steel-concrete composite structure continuous box girder and manufacturing method thereof

Abstract

The invention discloses a steel-concrete composite structure continuous box girder and a manufacturing method thereof, and belongs to the technical field of bridge structures. The continuous box girder still adopts a flat steel web in a sagging moment area, but adopts a corrugated steel web to replace a conventional flat steel web in a middle fulcrum hogging moment area, adopts an embedded PBL shear connector to connect the corrugated steel web and a concrete top plate, and is filled with an elastic material between the outer sides of a wave crest section and a wave trough section of the corrugated steel web and a concrete contact surface to form a reserved deformation buffer area. Once prestress is applied to the hogging moment area, compressive deformation is prone to occurring under pressure due to the fact that the longitudinal rigidity of the corrugated steel web is small, and meanwhile, the elastic material allows the corrugated steel web to transversely expand and deform. By means of the combined action of the two factors, the pre-pressing stress can be effectively applied to the concrete top plate, and the prestress applying efficiency is effectively improved. The compositestructure effectively relieves the possibility of concrete cracking in the hogging moment area, and the safety and durability of the bridge are improved.

Description

technical field [0001] The invention belongs to the technical field of bridge structures, and in particular relates to a steel-concrete composite structure continuous box girder and a manufacturing method thereof. Background technique [0002] The steel-concrete composite structure simply supported beam takes advantage of the compressive strength of concrete, and replaces the concrete in the mid-span tension zone with a steel structure, which effectively avoids the cracking of the lower concrete. However, the main girder in the negative moment zone of the steel-concrete composite continuous girder bridge is in an unfavorable stress state where the steel girder is under compression and the concrete bridge deck is under tension. The bridge deck concrete bears a large tensile stress and is prone to cracking, which leads to a decrease in structural stiffness. At the same time, the steel beams in the compression area also have stability problems. Therefore, in practical engineer...

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Problems solved by technology

However, the prestress applied to the roof concrete in the negative moment area increases the shear stress at the junction of the concrete and the steel beam, and since the elastic modulus of the flat steel web is greater than the concrete elastic modulus, the prestress applied in the negative moment area is large Part of it is consumed on the steel web and steel flange, and the actual effective precompression stress applied to the roof concrete is very limited, which greatly affects the crack resistance of the concrete roof

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