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Steel crane beam structure integrity evaluation method considering constraint effect

A technology of structural integrity and constraint effect, which is applied in the structural integrity assessment of steel crane girders, and the field of structural integrity assessment of steel crane girders considering constraint effects, can solve the problem of consuming structural safety reserves, so as to ensure safe production and improve safety reserve effect

Active Publication Date: 2018-05-18
SOUTHEAST UNIV
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The results obtained by traditional structural integrity assessment methods will be optimistic, which will consume the safety reserve of the structure and even cause engineering accidents

Method used

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  • Steel crane beam structure integrity evaluation method considering constraint effect
  • Steel crane beam structure integrity evaluation method considering constraint effect
  • Steel crane beam structure integrity evaluation method considering constraint effect

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Embodiment

[0037] Taking the integrity assessment of the steel crane beam of a certain domestic industrial plant as an example, the evaluation method of the present invention is described in detail; the distribution of the crane wheels in the plant is as follows: figure 2 .

[0038] Step 1, detect the cracks that appear near the weld seam between the upper flange of the steel crane girder in the industrial plant and the web, fit the actual cracks with surface elliptical cracks, and obtain the geometric parameters of the cracks in the steel crane girder, including the actual position and size of the crack, (ie The major semi-axis length 2c and the minor semi-axis length 2a) of the crack, the track eccentricity e 0 , and the crane wheel pressure P under the actual working load y0 ;

[0039] Step 2, establishing a three-dimensional finite element model of a steel crane beam containing cracks;

[0040] According to the detection data in step 1, when using the finite element software ABAQ...

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Abstract

The invention discloses a steel crane beam structure integrity evaluation method considering the constraint effect. The method comprises steps that a steel crane beam in the service period is tested,and a geometric parameter of a crack in the steel crane beam, a track eccentric distance E0 and the crane wheel pressure Py0 in an actual working load are acquired; secondly, a three-dimensional finite element model of the steel crane beam with the crack is established, and a stress intensity factor K of the crack front of the steel crane beam and a constraint effect characterization parameter T stress are extracted from the model; influence of the T stress on structure integrity is considered, and R6 failure criteria are collected; and lastly, the corrected R6 failure criteria are utilized todetermined the structure integrity condition of the steel crane beam. The method is advantaged in that influence of the constraint effect of the crack front on structure integrity of the crane beam is considered, the T stress is the characterization parameter, the method can be utilized for evaluating safety production of the cracked steel crane beam in service, the safety reserve of the overallstructure can be enhanced, and safety production of the steel crane beam with the defect can be better guaranteed.

Description

technical field [0001] The invention relates to a method for evaluating the structural integrity of a steel crane girder, in particular to a method for evaluating the structural integrity of a steel crane girder considering constraint effects, and belongs to the field of steel crane girder safety production evaluation. Background technique [0002] The crane girder bears the cyclic load caused by the repeated back and forth movement of the crane for a long time, coupled with the influence of the eccentricity of the track, fatigue cracks are easily formed near the weld between the web and the upper flange. Especially for crane beams of heavy-duty working system, the operation is frequent, and the phenomenon of detecting cracks is relatively common, and most of them are elliptical cracks on the surface. [0003] Confinement effect, as a fracture concept that emerged in the 1970s, is to characterize the influence of the geometry of the specimen, crack configuration and loading ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M5/00
CPCG01M5/0033
Inventor 吴佰建李兆霞郭华泾
Owner SOUTHEAST UNIV
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