Simplified limit load estimation using mα-tangent method for branch pipe junctions under internal pressure and in-plane bending

Kim, Sang Hyun; Gim, Jae Min; Miao, Wang; Kim, Yun Jae

doi:10.1016/j.prostr.2016.06.323

Cited by 1 publication

(1 citation statement)

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“…Numerical analysis based on the finite element method is usedwhen analysing stresses of structural elements in pipelines, primarily pipeline branch junctions. It is a very real problem of defining locationsand areas of pipeline in which reinforcements should be made [2] and also a problem of the estimation of limitin which yield stresses are observed [3], defining stress concentration factor, limit load [4] and [5], and burst pressure [6]. The use of experimental methods is very difficult under real, working conditions, because it is not possible to vary internal pressure in real conditions in some structural elements, such as branch junctions, until plastic strainsare observedunder working conditions.…”

Section: Introductionmentioning

confidence: 99%

Stress Analysis of a Pipeline as a Hydropower Plant Structural Element

Ćulafić

Maneski

Bajić

2019

SV-JME

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This paper describes pipeline stress analysis, primarilybranch junctions, as a structural element in hydro-power plants. Pipelines are exposed to internal pressure,which is present under working conditions. Analysis of stresses in the pipeline of the hydropower plant is based on analytical, numerical, and experimental methods. In this paper, we will define the critical elements of the pipeline. After that, we will determine critical areas in the branch junction, under experimental conditions, where strain gauges should be installed. The obtained resultsshow that a boiler formula can be efficiently applied in the stress analysis. Also, a correlation between the internal pressure and the maximum circumferential stresses in the elastic zone is given. In the final sections of the paper, the limit value of the internal pressure as a load for which stress in the zone of plasticity appears and the safety factor of the branch junction in the exploitation conditions are determined. The contribution of this work is the unification and deepening of the topic related to the problem of the testing ofhydro-power structural elements.

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