Method for calculating residual bending moment ultimate loads of damaged pipelines under combined load action

A combined load and ultimate load technology, applied in the directions of calculation, computer-aided design, design optimization/simulation, etc., can solve the problems of lack of research and lack of calculation methods for the safety assessment of submarine pipelines, and achieve the goal of improving calculation accuracy and wide application value. Effect

Active Publication Date: 2018-10-12
ZHEJIANG MEASUREMENT SCI RES INST
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Problems solved by technology

However, there is a lack of relevant research on the ultimate bearing capacity under the combined action of multiple loads.
[0003] Therefore, in the prior art, there is

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  • Method for calculating residual bending moment ultimate loads of damaged pipelines under combined load action
  • Method for calculating residual bending moment ultimate loads of damaged pipelines under combined load action
  • Method for calculating residual bending moment ultimate loads of damaged pipelines under combined load action

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[0054] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0055] The embodiment of the method according to the present invention is as follows:

[0056] In order to verify the reliability of this evaluation method, it is necessary to compare its evaluation results with existing evaluation methods.

[0057] The existing bending moment evaluation methods mainly include the following,

[0058] 1) ASME section method

[0059] In the assessment method defined by ASME, the defects detected by the pipeline defect detection system are usually treated equivalently, and the irregular defect is equivalent to a defect of equal depth, and the depth value is equal to the maximum depth of the detected defect value:

[0060] a eq =max a(ξ)

[0061] Therefore, the evaluation and calculation results will over-exaggerate the influence of the defect on the ultimate bending moment load, especially when the depth of the defect changes...

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Abstract

The invention discloses a method for calculating residual bending moment ultimate loads of damaged pipelines under a combined load action. The method is used for respectively calculating bending moment ultimate loads of damaged pipelines according to four conditions that all the flaws of the damaged pipelines fall in a compressive region, most of the defects all in the compressive region and a small part of the defects fall in a tensile region, all the defects fall in the tensile region, and most of the defects fall in the tensile region and a small part of the defects fall in the compressiveregion. The method is capable of carrying out correct assessment and calculation to obtain bending moment ultimate load calculation results so as to improve the calculation precision, and has a relatively wide application value in the field of damaged pipeline safety assessment.

Description

technical field [0001] The invention relates to a method for calculating the ultimate load of a pipeline, in particular to a method for calculating the ultimate load of the residual bending moment of a damaged pipeline under combined load. Background technique [0002] Submarine pipelines are an important part of offshore oil and gas development, the main means of oil and gas transportation, and are considered the lifeline of offshore oil and gas production systems. The seabed environment is relatively complex, and the pipelines are subject to different loads under different environmental conditions. Generally, the pipelines are subjected to pressure loads. When the pipeline is affected by seabed deformation, debris flow, etc., the suspension of the pipeline The span phenomenon will add a bending moment load to the pipe. At present, the focus of research at home and abroad is the ultimate bearing capacity of the pipeline under the independent action of a single load. For th...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F2113/14G06F2119/06G06F30/20
Inventor 周闻青陈挺叶欣茅振华周红明
Owner ZHEJIANG MEASUREMENT SCI RES INST
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