Method for identifying deflection of beam structure by graph multiplication based on distributed optical fibers

Abstract

The invention discloses a method for identifying the deflection of a beam structure by graph multiplication based on distributed optical fibers. The method comprises the steps of determining a bridge structure form, a bridge length, a beam structure section form and bridge material characteristics which need to be monitored; acquiring a strain value of each measuring point at the bottom of the bridge under the action of any load working condition; performing data acquisition and processing, establishing a relation function between the strain value and the deflection of each measuring point at the bottom of the bridge by using a graph multiplication principle, and calculating to obtain the deflection value of the to-be-measured point of the bridge at any moment. The beam structure deflection identification method is suitable for static load and moving load, the relation function of strain and deflection is established by adopting graph multiplication, the calculation process is simple, a deflection change curve of any position of the bottom of the bridge along with time can be analyzed, and then the overall deformation condition of the bridge is obtained. Compared with the result of finite element analysis, the method has the advantages that the average error of the method is less than 1%, and the method has certain engineering use value and application prospect.

Description

technical field [0001] The invention belongs to the technical field of bridge monitoring, and in particular relates to a method for identifying beam structure deflection based on distributed optical fiber graph multiplication. Background technique [0002] With the rapid development of society, the number of new bridges in our country is increasing. In order to prevent the occurrence of traffic safety accidents, the health detection of structures in bridge operation is an indispensable work. The deflection and deformation of the bridge directly reflect the overall stiffness, stability and bearing capacity of the bridge, and are important parameters for evaluating the health status of the bridge during the operation phase. Therefore, it is very important to study the deflection identification of the bridge. [0003] At present, the commonly used direct measurement methods of bridge deflection include dial indicators, level instruments, total stations, etc., but these simple m...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems existing in the prior art, the present invention provides a distributed optical fiber-based monitoring system to solve the problems of inconvenient installation of monitoring instruments, unsuitable for long-term monitoring, low measurement accuracy and cumbersome calculation of monitoring data in existing bridge deformation monitoring. The method of identifying beam structure deflection by graph multiplication, the specific technical scheme is as follows:

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