Steel structure bridge with steel-concrete composite beams arranged at beam ends

Abstract

The invention discloses a steel structure bridge with steel-concrete composite beams arranged at the beam ends. The steel structure bridge with the steel-concrete composite beams arranged at the beamends can effectively improve the overall rigidity of the bridge and the vertical dynamic rigidity of an expansion joint position, greatly reduce the impact of an automobile live load at the beam endsand the vibration of beam bodies at the expansion joint, so that the durability of the bridge is effectively improved. The steel structure bridge with the steel-concrete composite beams arranged at the beam ends comprises steel main beams at both sides of the transverse direction, and main bodies of the steel main beams are steel box beams composed of steel main beam bottom plates, steel main beamtop plates and steel main beam web plates at both sides. According to the steel structure bridge with the steel-concrete composite beams arranged at the beam ends, the steel-concrete composite beamsare arranged at the beam ends of the steel main beams, main bodies of the steel-concrete composite beams are of box type structures composed of bottom plates, top plates and web plates on both sides,the two longitudinal ends of the box structures are welded to the steel main beam web plates on the same side, concrete is poured to fill the inner space of the box structures, and the box structuresare fixedly connected with the steel main beams on the same side into a whole through shear keys.

Description

technical field [0001] The invention relates to bridges, in particular to a steel-concrete composite beam connection structure suitable for steel bridges. Background technique [0002] Due to the light weight and relatively small stiffness of the steel structure bridge, the beam end position is under the action of the live load of the vehicle, and its vibration is more obvious, especially at the beam end expansion joint position, the impact coefficient is relatively large. The end beams of traditional steel-concrete composite bridges are mostly in the form of I-beams. Due to the low stiffness of I-beam beams, the impact effect of vehicle loads is more significant. According to the test of the same type of real bridge, due to the impact of vehicle jumping caused by the bridge at the expansion joint position, the impact coefficient at the end beam position has reached more than 2.0, which greatly exceeds the impact coefficient of ordinary bridges (0.05-0.3), which greatly aggr...

AI Technical Summary

Problems solved by technology

According to the test of the same type of real bridge, due to the impact of vehicle jumping caused by the bridge at the expansion joint position, the impact coefficient at the end beam position has reached more than 2.0, which greatly exceeds the impact coefficient of ordinary bridges (0.05-0.3), which greatly aggravates the bridge. structural loads

In addition, due to the significant increase of the live load, the fatigue damage of the steel structure is increased at the same time, and the extension of fatigue cracks in turn weakens the section stiffness, aggravating the live load effect, resulting in a vicious circle

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