External excitation loading test device for simulating driving process

Abstract

The invention discloses an external excitation loading test device for simulating a driving process. The test device comprises a vibration platform, a section model which is installed on the vibrationplatform through rigid constraint, and a vehicle model which is fixed on the section model through the elastic constraint. The vibration platform is used for driving the section model to perform oneor more forms of vibration. According to the invention, various possible structural responses of the bridge structure under the action of power can be simulated, and the external force and the acceleration of the vehicle can be measured.

Description

technical field [0001] The invention relates to the technical field of vibration simulation, in particular to an external excitation loading test device for simulating the driving process. Background technique [0002] Modern long-span bridges will produce dynamic responses due to various external effects, that is, various driving vibrations. These external effects include wind, earthquake, waves and ship strikes, especially bridges across the sea, which are extremely threatened by these effects. Long-span bridges such as cable-stayed bridges and suspension bridges are very sensitive to wind. Under normal operating conditions, wind-induced vibrations will occur, including vertical bridge vibration, side bridge vibration, torsional vibration, and the coupling between these vibration forms. According to the regulations in the current code, the bridge will only restrict the passage of vehicles and pedestrians when the wind speed is greater than a certain limit. This regulatio...

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Problems solved by technology

[0007] 1) It is impossible to simulate the vibration of the bridge structure in a real wind environment, because the bridge segment model is fixed and cannot move during the test process, and no matter how much wind blows during the entire measurement process, no vibration will occur, which is not in line with reality;

[0008] 2) The acceleration of the vehicle cannot be measured. The acceleration of the vehicle is not only caused by the wind force acting on the vehicle, but also closely related to the vibration of the bridge. Since the bridge segment model is fixed, it is impossible to measure the acceleration of the vehicle model when the bridge vibrates. cannot be accurately assessed;

[0009] 3) It cannot reflect the interaction between the vehicle and the bridge. The existing method can only consider the influence of the shape of the bridge on the wind load on the vehicle, but cannot consider the influence of the structural response of the bridge on the vehicle driving on it. Therefore, this simulation is incomplete

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