Method for identifying damage on inhaul cables of long-span cable-stayed bridges

A technology for damage identification and bridge cables, which is applied to bridges, bridge parts, bridge construction, etc., can solve problems such as prone to local optimum, low accuracy of damage identification and positioning, and identification overfitting

Inactive Publication Date: 2018-05-29
WUHAN OPTICS VALLEY BEIDOU HLDG GRP
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Problems solved by technology

[0004] The invention provides a cable damage identification method of a long-span cable-stayed bridge, which solves the technical problems o

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  • Method for identifying damage on inhaul cables of long-span cable-stayed bridges
  • Method for identifying damage on inhaul cables of long-span cable-stayed bridges
  • Method for identifying damage on inhaul cables of long-span cable-stayed bridges

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Embodiment Construction

[0035] The embodiments of the present application provide a cable damage identification method for long-span cable-stayed bridges, so as to solve the technical problems in the prior art of low damage identification and location accuracy, over-fitting of damage degree identification and prone to local optimal defects.

[0036] In order to better understand the above technical solutions, the above technical solutions will be described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the embodiments of the present invention and the specific features in the embodiments are detailed descriptions of the technical solutions of the present application. , rather than limiting the technical solutions of the present application, the embodiments of the present application and the technical features in the embodiments can be combined without conflict.

[0037] see figure 1 , a cable damage identification method ...

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Abstract

The invention belongs to the technical field of bridges, and discloses a method for identifying damage on inhaul cables of long-span cable-stayed bridges. The method includes building finite element models of cable-stayed bridges; applying simulated wind load to the finite element models and acquiring wind speed time-history curves of the inhaul cables; computing stress time histories of the inhaul cables under wind load effect on the basis of the wind speed time-history curves; carrying out lifting wavelet packet decomposition on the stress time histories and stress time histories of bridge inhaul cables in non-damage states, extracting wavelet packet signal component energy and utilizing energy accumulation variation values as characteristic values for identifying damage positions of thestay cables; acquiring lifting wavelet packet component energy difference, building BP-AdaBoost models for identifying structural damage degrees and computing the fatigue reliability of the inhaul cables on the basis of the structural damage degrees. The method for identifying the damage on the inhaul cables of the long-span cable-stayed bridges has the advantages of excellent adaptability and identification reliability.

Description

technical field [0001] The invention relates to the technical field of bridges, in particular to a method for identifying damage to cables of long-span cable-stayed bridges. Background technique [0002] The structure of modern cable-stayed bridges is mainly composed of cable towers, main girders, cable-stayed cables and other components. As a key part of cable-stayed bridges, cable-stayed cables have the characteristics of small mass, large flexibility, low damping, and high stress. A large number of operational examples It shows that the stay cables are the components with the lowest service life and easy damage in the whole bridge. During the entire service period of the structure, the components are in the coupled vibration state under the action of wind load for a long time, and the fatigue damage of the components caused by this cannot be ignored. [0003] However, in the existing technology, the decomposition algorithm for the identification of the damage position of...

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Application Information

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IPC IPC(8): G06F17/50E01D19/16
CPCE01D19/16G06F30/23
Inventor 谭冬梅柳勇陈武薛茗金超吴浩毛善明
Owner WUHAN OPTICS VALLEY BEIDOU HLDG GRP
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