Rapid bridge testing and parameter identification method based on mobile vehicle

A parameter identification and vehicle technology, which is applied in the direction of elastic testing, machine/structural component testing, measuring devices, etc., can solve the limited role of bridge structure safety performance evaluation, the inability to obtain structural mode shape scaling coefficients, and the inability to meet multiple Vehicle passing and other issues, to achieve effective safety assessment and maintenance management, convenient and short test, and low cost

CN109813511AActive Publication Date: 2019-05-28SOUTHEAST UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2019-05-28

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Abstract

The invention discloses a rapid bridge testing and parameter identification method based on a mobile vehicle, which comprises the following steps: acquiring structural vibration response data of a structure when the vehicle passes through a sensor arranged on the bridge; acquiring time-varying dynamic characteristic parameters of an axle coupling system by utilizing a modal identification algorithm; acquiring mapping relationships met by the time-varying dynamic characteristic parameters of the axle coupling system and a structural vibration mode scaling coefficient by combining a mass springaxle coupling model dynamic equation; calculating the structural quality normalized vibration mode scaling coefficient by utilizing the dynamic characteristic parameters at different moments; calculating the structural quality normalized displacement mode by the vibration mode scaling coefficient; reconstructing a structural true frequency response function. The method can identify the deep parameters of the structure only from the coupled vibration response of the axle, and the method is applicable to the multiple vehicle operating conditions on the bridge; the method has the advantages of safety, economy, convenience and quickness, and can safely and efficiently evaluate the bridge.
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Description

[0001] Field

[0002] The invention relates to the field of bridge structure vibration testing in civil engineering structure health monitoring technology, in particular to a method for quick testing and parameter identification of bridges based on moving vehicles. Background technique

[0003] Structural health monitoring technology is one of the most effective ways to improve the health and safety of civil and traffic engineering structures and realize their sustainable performance management. Injury is a key topic.

[0004] Environmental vibration test is one of the main means of health monitoring and detection of existing bridge structures. It uses natural conditions to excite the bridge. Compared with artificial vibration test, it has the advantage of convenient operation, but it can only output the basic It cannot directly support the safety performance evaluation of bridge structures. Compared with the environmental vibration test, the shock vibration test needs to ar...

Examples

Embodiment 1

[0039] A method for rapid testing and parameter identification of bridges based on moving vehicles, such as figure 1 shown, including the following steps:

[0040] S1, according to the specific type of structure and test requirements, determine the layout of the sensors, deploy sensors on the bridge, use the deployed sensors to collect and store the vehicle-bridge coupling vibration response data of the bridge structure when the vehicle passes.

[0041] S2, through the modal recognition algorithm, identify the vehicle-bridge coupling vibration response data, and obtain the time-varying dynamic characteristic parameters of the coupling system;

[0042] When the vehicle passes by, the vehicle and the bridge form a time-varying coupling system. Because the vehicle and bridge interact with each other, the dynamic characteristics of the system will change with the position of the vehicle. The traditional method cannot be used to identify the system modal parameters. The response ca...