Damage identification method for constant cross-section beams based on horizontal support reaction force influence line difference

Abstract

The invention discloses a damage identification method for equal-section beams based on the difference of influence lines of horizontal support reaction forces, the steps are as follows: set horizontal supports at both ends of the beam measurement span to constrain the horizontal displacement of the measurement span; adjust the horizontal support of the beam structure Set the measuring point at the measuring point and apply the moving load in the horizontal direction to obtain the influence line of the horizontal support reaction force of the beam structure; make a difference on the influence line of the horizontal support reaction force at the measuring point, and pass the sudden change of the difference curve of the horizontal support reaction force influence line Carry out damage location; further quantify the damage degree through the differential change of the horizontal support reaction force influence line at the measuring point. The present invention does not require information on the undamaged beam structure, and only needs to set measuring points on the horizontal support of the beam structure, which requires less measuring points, saves the cost of monitoring sensors, and can accurately locate and quantify the damage of beam structures with equal cross-sections , applied to the damage assessment of constant-section beam structures.

Description

technical field [0001] The invention relates to the technical field of damage detection of beam structures, in particular to a damage identification method for equal-section beams based on horizontal support reaction force influence line difference. Background technique [0002] Since the reform and opening up, my country's productivity has been released and the economy has developed rapidly. And infrastructure construction and national economic development complement each other, such as bridge construction occupies a certain position in it. At present, the number of bridges in my country ranks first in the world and is still increasing rapidly. During the service period of the bridge, it is inevitable that part of the bridge structure will be damaged due to the load and the environment, and the safety of the bridge is not only related to traffic, but also closely related to social development and people's lives. Therefore, it is necessary to monitor the health of the brid...

AI Technical Summary

Problems solved by technology

With the development and progress of sensor technology, the method based on the difference of influence line of horizontal support reaction force is expected to be applied to the damage identification of structures. At present, there are few literature reports on the identification of horizontal support reaction force that do not require pre-damage information.

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