Arranging method of sensor for detecting fatigue stress of steel box girder bridge

A technology of fatigue stress and layout method, which is applied to bridges, buildings, etc.

Inactive Publication Date: 2012-11-07
SOUTHEAST UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

However, most of the current sensor layout methods in structural health monitoring focus on the optimal layout of acceleration sensors for dynamic response monitoring, while stress sensor layout ...

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  • Arranging method of sensor for detecting fatigue stress of steel box girder bridge
  • Arranging method of sensor for detecting fatigue stress of steel box girder bridge
  • Arranging method of sensor for detecting fatigue stress of steel box girder bridge

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Embodiment Construction

[0028] Such as figure 1 As shown, the present invention is a method for selecting the priority arrangement position of sensors for fatigue stress monitoring of steel box girder bridges, which can be generally expressed as the following steps:

[0029] (1) Select the candidate measuring points of the steel box girder stress sensor, respectively establish the overall finite element model of the steel box girder bridge and the fine finite element model of the local section where the candidate measuring points are located. The units in the spot weld area are subdivided so that it can accurately reflect the fatigue stress state of the weld area;

[0030] (2) Establish the relationship between the overall finite element model and the local finite element model of the steel box girder by using the sub-model method, and extract the fatigue stress time-history curves of all candidate measuring points under the same working conditions;

[0031] (3) The fatigue stress time-history curve...

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Abstract

The invention discloses an arranging method for a sensor for detecting fatigue stress of a steel box girder bridge based on a fatigue damage degree index, comprising the following steps: calculating fatigue stress of at a steel box girder candidate measure point area through the finite element model technology; constructing the fatigue damage degree index based on an S-N curve and a Miner linear damage accumulation theory provided by design specifications; and determining an arranging position of the sensor for detecting fatigue stress of the steel box girder bridge according to size of the fatigue damage degree index. The method provided by the invention effectively ensures analysis precision for fatigue stress of the steel box girder bridge by using the finite element model analysis technology, constructs the fatigue damage degree index of the steel box girder bridge on that basis, and provides reasonable evidence for selecting the arranging position of the sensor, so that subjectivity, empirical property and blindness for arranging the traditional steel box girder fatigue stress sensors are effectively overcome, and the method will be certainly applied and popularized widely.

Description

technical field [0001] The invention is mainly used in the field of civil engineering bridge or structural health monitoring, and relates to a method for arranging strain sensors of bridges, in particular to a method for arranging sensors for fatigue stress monitoring of steel box girder bridges. Background technique [0002] The steel orthotropic deck of a steel box girder bridge not only directly bears the traffic load as a bridge deck system, but also participates in forming the upper flange of the beam or even the longitudinal beam, thus becoming a part of the main girder. Welding details are prone to fatigue cracking, and the research on fatigue evaluation of orthotropic decks of steel box girders is one of the hot spots in the field of bridge engineering. In the fatigue assessment of steel box girders, the acquisition of fatigue stress is very important. In recent years, with the rise of structural health monitoring research, it has become an important way to obtain f...

Claims

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Application Information

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IPC IPC(8): E01D2/04
Inventor 丁幼亮邓扬周广东宋永生李爱群
Owner SOUTHEAST UNIV
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