Rapid testing and parameter identification method for bridges based on moving vehicles

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.

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...

AI Technical Summary

Problems solved by technology

The widely used method is to identify bridge modal information by installing accelerometers on vehicles and collecting acceleration data when vehicles are driving on bridge decks. However, it mainly relies on indirect measurements of bridge responses and can only achieve bridge frequency and mode shapes. The basic modal parameters and preliminary damage identification cannot obtain the structural mode shape scaling coefficient, and the effect on the safety performance evaluation of bridge structures is also very limited.

Another scholar proposed to use the time-invariant modal parameters of the structure when there is no car passing and the time-varying modal parameters of the structure when there is a car passing to establish a solution algorithm for the mode shape scaling coefficient, but this method still depends on the time-consuming environment Vibration test is used to obtain the basic dynamic characteristic parameters of the structure, and it is only valid for a single vehicle passing through, and cannot meet the situation of multiple vehicles passing through, and the practicability is greatly reduced

Images