A loading device for railway bridge creep test under the action of vehicle-induced cyclic load

Abstract

The invention relates to a railway bridge creep test loading device under the action of vehicle-induced cyclic load. By arranging an electromagnet on the rail car, and suspending a counterweight hanging basket in an excavated groove under the track, the constant load can be simply realized It is applied together with the live load of the train operation, and the size of the live load of the train operation can be adjusted by increasing or decreasing the number of electromagnet coils and the number of counterweight blocks in the rail car, so that the loaded dead load and live load are constant without a certain interval. Time increases the load; the present invention can increase the train load through the attractive force of the electromagnet on the train and the permanent magnet fixed on the foundation; multiple flexural concrete main beams can be applied at one time by reserving holes in the straight line section of the track The train live load effectively improves the use efficiency.

Description

technical field [0001] The invention relates to the technical field of civil engineering, in particular to a loading device for a railway bridge creep test under the action of a vehicle-induced cyclic load. Background technique [0002] Compared with ordinary highway bridges, railway concrete bridges have a higher ratio of live load to self-weight, and are affected by concrete creep. Large-span prestressed concrete bridges will produce excessive prestress loss and time-varying deformation. The deformation will seriously affect the safe operation of the train. In recent years, the number of accidents caused by long-term deformation of bridges has increased year by year. The reason is that the traditional concrete creep deformation prediction ignores the increasing effect of train operating load on long-term deformation, and the actual structural deformation is significantly underestimated in the bridge design stage. . Although relevant scholars have carried out a lot of act...

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Problems solved by technology

At present, most of the relevant scholars simulate the traffic load in the way of concentrated load cyclic loading. The above-mentioned load can only simulate the fixed-point concentrated load, and cannot effectively simulate the influence of the train running track on the long-term deformation. The creep test research is relatively lacking, the reason is that the creep test equipment is relatively scarce, and there is a technical problem of how to increase the train operating load as much as possible under the premise of using a smaller scale model car

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