Method for evaluating resistance deterioration of stay cable of steel strand of cable-stayed bridge taking fretting fatigue

A technology of stay cable resistance and fretting fatigue, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problem of not considering the interaction of parallel steel cables and cables, etc.

Active Publication Date: 2012-03-14
WUHAN UNIV OF TECH
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Problems solved by technology

At present, the research on the resistance degradation of cable-stayed cables is mainly based on the development of parallel steel wire stay cables. Through the research on the state of parallel steel wire stay cables after corrosion and fatigue, the resistance degradation equation of parallel steel wire stay cables is obtained, and the parallel steel wire stay cables are not considered. Interaction between steel wires in stay cables

Method used

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  • Method for evaluating resistance deterioration of stay cable of steel strand of cable-stayed bridge taking fretting fatigue
  • Method for evaluating resistance deterioration of stay cable of steel strand of cable-stayed bridge taking fretting fatigue
  • Method for evaluating resistance deterioration of stay cable of steel strand of cable-stayed bridge taking fretting fatigue

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Embodiment 1

[0074] Example 1, Evaluation of Resistance Degradation of Steel Strand Stay Cables of a Yangtze River Bridge

[0075] 110m steel strand cable-stayed cables of a certain Yangtze River Bridge, the relevant parameters of cable-stayed cable resistance degradation are shown in Table 1 and Table 2

[0076] Table 1 Steel strand galvanized layer, steel parameters

[0077]

[0078] Table 2 Basic Design Parameters of Steel Strand Leads

[0079]

[0080] Through the analysis of the fundamental frequency of the stay cables, the amplitude of the stay cables of the 110m-long steel strand of the Yangtze River Bridge is taken as the fundamental frequency of the first-order vibration is 1.02Hz, and the amplitude f s =max{7 / 1700, 2.5 times the cable diameter}, which is taken as 0.5m.

[0081] (1) A simplified finite element model of steel wire contact is established for the anchorage end of the steel strand stay cable. The calculation shows that the stress points of the finite element m...

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Abstract

The invention provides a method for evaluating the resistance deterioration of a stay cable of a steel strand of a cable-stayed bridge taking fretting fatigue. The method comprises the following steps of: sampling practical parameters of steel wires of the stay cable of the cable-stayed bridge on site; obtaining a fretting fatigue depth fitting formula among steel wires of the stay cable of the steel strand of the cable-stayed bridge; dividing resistance deterioration phases of the stay cable; and substituting the actual fretting fatigue depth among the steel wires into the deterioration process of the stay cable of the steel strand of the cable-stayed bridge according to division of different phases to obtain a resistance deterioration equation of the stay cable of the steel strand of the cable-stayed bridge taking the fretting fatigue, and evaluating the situation of the resistance deterioration of the stay cable. The method describes the deterioration process of the stay cable of the steel strand more comprehensively and more accurately, and the evaluation process is simple and practical.

Description

technical field [0001] The invention relates to the field of bridge and culvert engineering in the transportation industry, in particular to a method for evaluating resistance degradation of cable-stayed cables of steel strands of cable-stayed bridges in consideration of fretting damage. Background technique [0002] The evaluation of resistance degradation of steel strand cables of cable-stayed bridges has always been an important research issue in the design, construction and operation of cable-stayed bridges. For steel strand cable-stayed cables, due to the tight connection between the steel wires, when subjected to weather and vehicle loads, the vibration of the cable-stayed cables causes the anchorage end of the cable to be subjected to repeated stretching and bending, and the steel strand cable-stayed wires The interaction between force and fretting slip causes fretting damage, so the analysis of resistance degradation of steel strand stay cables needs to consider the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 刘沐宇高宗余陈齐风
Owner WUHAN UNIV OF TECH
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