Steel-concrete composite continuous beam, connecting piece of hogging moment area of steel-concrete composite continuous beam and construction method

Abstract

The invention discloses a steel-concrete composite continuous beam, a connecting piece of a hogging moment area of the steel-concrete composite continuous beam and a construction method. The connecting piece comprises a perforated plate, transverse steel bars and a foam filling material; the perforated plate is fixedly welded to a top plate of a hogging moment area steel beam, the length extendingdirection of the perforated plate is parallel to the bridge direction of a bridge, a row of oval holes are formed in the perforated plate in the length extending direction of the perforated plate, and the long axis direction of each oval hole is parallel to the length extending direction of the perforated plate. The number of the transverse steel bars is consistent with that of the oval holes; the length extension direction of each transverse steel bar is parallel to the transverse bridge direction of the bridge, and the transverse steel bars penetrate through the oval holes in a one-to-one correspondence mode; and the foam filling material is a filling block body with a complete circular through hole in the middle. Therefore, the steel beam in the hogging moment area and the concrete topplate in the hogging moment area can longitudinally slide, the tensile stress of a bridge deck slab in the area is effectively reduced, meanwhile, the transverse anti-shearing effect and the verticalanti-pulling capacity are reserved, and the safety and durability of the bridge are improved.

Description

technical field [0001] The invention relates to a steel-concrete composite continuous beam and a connector and a construction method of the negative bending moment area thereof, belonging to the technical field of bridge structures. Background technique [0002] The steel-concrete composite structure simply supported beam takes advantage of the compression resistance of concrete, and replaces the concrete in the mid-span tension zone with a steel structure, effectively avoiding 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 problems. Rainwater may seep around the shear connectors and cause the connectors to rust, resulting in a decrease in structural rigidity and durability. T...

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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

[0003] At present, the commonly used anti-pull and non-sliding shear connectors realize that the connector does not transmit shear force by wrapping a layer of low elastic modulus material around the stud connector, but it weakens the longitudinal shear resistance of the connector and also weakens the Lateral shear resistance is reduced, and after long-term use, the low elastic modulus material around the stud connection may be corroded, forming voids around the connection, thereby affecting the durability of the structure

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