Long-gauge-length-strain-influence-envelope-based bridge damage identification method

Abstract

The invention discloses a long-gauge-length-strain-influence-envelope-based bridge damage identification method. The method comprises: a distributed long-gauge-length strain sensing monitoring system is constructed; when a vehicle crosses a bridge, data acquisition is carried out; the collected data are decomposed; a long-gauge-length strain influence envelope of the bridge is extracted; and then bridge damage identification and bearing state estimation are carried out. Long-gauge-length strain sensors are used for measuring strain information of the bridge when the vehicle is crossing the bridge; and with an empirical mode decomposition method, a long-gauge-length strain time history is decomposed, a static strain component extraction criterion is put forward, and a strain influence envelope of the bridge is formed based on the extracted maximum static strain value, thereby determining a bearing force state of the bridge. During implementation, closing of the traffic is avoided; and on the basis of the long-gauge-length strain time history under vehicle driving, the rigidity distribution situation of the bridge can be detected rapidly.

Description

technical field [0001] The invention relates to the technical field of bridge sensing and monitoring, in particular to a bridge damage identification method based on a long gauge strain influence envelope. Background technique [0002] With the vigorous development of traffic construction, more and more bridges have been built one after another. At the same time, a large number of bridges have reached the service life of the design life, and they still bear huge vehicle loads when they exceed the design life. Therefore, it is very necessary to grasp the information of the safety, durability and normal function of the existing bridges in time. For this purpose, the bridge health monitoring system and intelligent control technology have been applied to the bridge structure and developed rapidly. Structural damage identification is the core of structural health monitoring system. Structural damage identification is to detect and evaluate the structure to determine whether the...

AI Technical Summary

Problems solved by technology

Frequency is not sensitive to local damage, it is difficult to reflect local damage, and the strain influence envelope of the bridge cannot be obtained by using traditional point strain gauges

[0006] (2) The damage detection of bridges requires a lot of manpower and financial resources, and bridge inspection vehicles are required at the same time, which will affect the normal traffic operation

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