Railway bridge creep test loading device under action of vehicle-induced cyclic load

Abstract

The invention relates to a railway bridge creep test loading device under the action of a vehicle-induced cyclic load. An electromagnet is arranged on a rail vehicle, a balance weight hanging basket is hung in a groove dug below the rail, the combined application of dead load and train operation live load is simply and conveniently realized, the magnitude of the train operation live load can be adjusted by increasing or decreasing the number of coils of the electromagnet and the number of balancing weights in the rail vehicle, the dead load and live load of loading are enabled to be constant,and the load does not need to be increased at certain time intervals. The train load can be increased through attraction force of the electromagnets on the train and permanent magnets fixed to the foundation; train live loads of multiple bent concrete main beams can be applied at a time by means of reserving holes in the straight line section of the rail, and the use efficiency is effectively improved.

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...

AI Technical Summary

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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