Method for predicting remaining useful life of steel box girder bridge top plate-longitudinal rib welding detail

A technology for steel box girders and details, applied in the use of sound waves/ultrasonic waves/infrasonic waves to analyze solids, measuring devices, instruments, etc., can solve problems such as fatigue crack development that cannot be considered in welding details, and achieve overcoming subjectivity and blindness and implementability strong effect

Inactive Publication Date: 2012-08-01
SOUTHEAST UNIV
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Problems solved by technology

However, this method cannot consider the actual fatigue crack development of welding details, and the predicted fatigue life of welding details is the whole life of welding details from crack initiation to development to fracture, not the remaining service life after fatigue cracks occur

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  • Method for predicting remaining useful life of steel box girder bridge top plate-longitudinal rib welding detail
  • Method for predicting remaining useful life of steel box girder bridge top plate-longitudinal rib welding detail
  • Method for predicting remaining useful life of steel box girder bridge top plate-longitudinal rib welding detail

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Embodiment Construction

[0023] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:

[0024] 1 pair figure 1 For the steel box girder bridge roof-longitudinal rib welding detail 4 shown, the fatigue crack 5 is detected by ultrasonic non-destructive testing technology, the location of the welding detail where fatigue cracking occurs is determined, and the expansion depth a of the fatigue crack 5 in the roof is measured, Such as figure 2 shown;

[0025] 2) The fatigue life of the roof-longitudinal rib welding detail 4 is affected by the stress in the transverse bridge direction of the roof. For this reason, a strain sensor 6 is installed on the roof 2 at the welding detail where fatigue cracking occurs (such as figure 2 shown), obtain the cross-bridge direction strain data of one month t (t=30) days;

[0026] 3) Taking 1 day as the calculation interval, use the rainflow counting method (a widely used fatigue stress data analysis metho...

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Abstract

The invention discloses a method for predicting the remaining useful life of a steel box girder bridge top plate-longitudinal rib welding detail subjected to fatigue cracking in an operating state. The method comprises the following steps of: detecting the fatigue crack of the steel box girder bridge top plate-longitudinal rib welding detail by an ultrasonic non-destructive detection technology, determining the position of the welding detail subjected to fatigue cracking, and measuring the extension depth of the fatigue crack in a top plate; and arranging a strain sensor on the top plate at the welding detail subjected to fatigue cracking to acquire a fatigue load effect spectrum under the action of an actual operating vehicle, establishing a fatigue fracture limit state equation of the welding detail according to a linear elastic fracture mechanics theory, and calculating the remaining useful life of the top plate-longitudinal rib welding detail. By the method, the respective advantages of the non-destructive detection technology and a health monitoring technology can be fully exerted to meet the fatigue evaluation requirement of the steel box girder bridge top plate-longitudinal rib welding detail in the operating state, and the defects of subjectivity and blindness of the traditional fatigue damage evaluation method for a steel box girder bridge are effectively overcome.

Description

technical field [0001] The invention relates to a method for predicting the remaining service life after fatigue cracking of steel box girder bridge roof-longitudinal rib welding details, which is mainly used in the field of fatigue damage detection of steel box girder bridges. Background technique [0002] The steel deck of a steel box girder bridge not only directly bears the traffic load as a bridge deck system, but also participates in the formation of the upper flange of the beam and even the longitudinal girder, and becomes a part of the main girder. Especially the roof-longitudinal rib welding details are prone to fatigue cracking. For example, in my country's Humen Bridge, fatigue cracks were found in some roof-longitudinal rib welding details five years after it was opened to traffic. How to accurately predict the remaining service life of steel box girder bridge roof-longitudinal rib welding details with fatigue cracks is one of the current hot spots in the field ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04G01N3/00
Inventor 丁幼亮邓扬宋永生
Owner SOUTHEAST UNIV
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