Damage positioning method of beam bridge structure based on mobile vehicle

Abstract

The invention discloses the damage positioning method of a beam bridge structure based on a mobile vehicle and belongs to the structure damage identification calculating field. The vehicles are movedat the different positions of the beam bridge structure, and the vehicles are considered as mass and are added to the structure. Through continuously moving the vehicles along a bridge length direction, the inherent frequency of a mass-structure system is measured, and then, stationary wavelet analysis is performed on a frequency signal and the damage position of the structure is positioned. By using the method, the information contents of the frequency can be greatly increased, the method does not depend on the finite element model of the structure, an anti-noise capability is high, operationis simple and is easy to implement, and a good application prospect is possessed.

Description

technical field [0001] The invention belongs to the technical field of structural health monitoring, and relates to a damage location method suitable for beam bridge structures. A method for locating structural damage locations based on mass-structural system frequency curves. Background technique [0002] Structural health monitoring (SHM) is a research hotspot in civil engineering. Damage identification provides a reliable theoretical basis for structural monitoring, early warning and safety assessment, and is an important theoretical basis for structural health monitoring. The natural frequency of the structure is the most basic characteristic information of the structure, which is the easiest to obtain and has high precision, so the damage identification method based on frequency information is the most widely used. [0003] The beam bridge structure has reasonable stress and mature calculation and analysis methods, and is one of the most important structural forms in c...

AI Technical Summary

Problems solved by technology

Generally, only some low-order modes can be identified in the measurement of actual engineering, which is not sensitive to local damage, and it is difficult to identify all damages of the structure by using only a few low-order modes

At present, the damage identification methods of beam structures mostly use the vibration information of the structure, which is easily affected by environmental noise, and the finite element model of the structure needs to be established to provide physical parameters of the intact structure in turn, which heavily relies on the structural model

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